Notebookcheck

Fujitsu Lifebook U939 Laptop Review: A compact business notebook with LTE

Including two Thunderbolt 3 ports. With a weight of less than one kilogram (<2.2 lb), the LTE-capable notebook for business users is worth a more detailed look. Our test will show whether the Fujitsu Lifebook U939 is not only light but also able to deliver some performance.
Mike Wobker, 👁 Andreas Osthoff, Stefanie Voigt (translated by Mark Riege),
Fujitsu Lifebook U939

After having reviewed the Lifebook U939X business convertible, we now take a more detailed look at the Lifebook U939. While this offers the same characteristics as the U939X, it comes in the classic notebook format. Whiskey Lake processors are still used here as well, but according to Fujitsu they will be replaced by Intel's Comet Lake CPUs starting in July.

At a price of about 1500 Euros (~$1694; starting from ~$1500 in the US), we compare the Lifebook U939 in our test with the competing devices listed below. You can also enter additional devices from our database below each of the sections for comparison. 

Fujitsu Lifebook U939 i5 (LifeBook U Series)
Processor
Intel Core i5-8265U 4 x 1.6 - 3.9 GHz, Whiskey Lake-U
Graphics adapter
Memory
16384 MB 
Display
13.3 inch 16:9, 1920 x 1080 pixel 166 PPI, Sharp SHP14BD, IPS, glossy: yes, 60 Hz
Mainboard
Intel Cannon Lake-U PCH-LP Premium
Storage
Samsung SSD PM981 MZVLB512HAJQ, 512 GB 
, 434 GB free
Soundcard
Intel Cannon Lake-LP - cAVS
Connections
2 USB 3.0 / 3.1 Gen1, 2 Thunderbolt, 1 HDMI, 1 Kensington Lock, Audio Connections: 3.5 mm audio combo port, Card Reader: SD, 1 SmartCard, 1 Fingerprint Reader
Networking
Intel Ethernet Connection I219-LM (10/100/1000/2500/5000MBit/s), Intel Wireless-AC 9560 (a/b/g/n = Wi-Fi 4/ac = Wi-Fi 5), Bluetooth 5.0, LTE Sierra Wireless EM7455 (Cat. 6), LTE
Size
height x width x depth (in mm): 15 x 309 x 213 ( = 0.59 x 12.17 x 8.39 in)
Battery
50 Wh Lithium-Polymer, Battery runtime (according to manufacturer): 14 h
Operating System
Microsoft Windows 10 Pro 64 Bit
Camera
Webcam: 2.1 MP, 16:9 (1920 x 1080)
Additional features
Speakers: stereo, Keyboard: chiclet, Keyboard Light: yes, 24 Months Warranty
Weight
900 g ( = 31.75 oz / 1.98 pounds), Power Supply: 349 g ( = 12.31 oz / 0.77 pounds)
Price
1500 Euro
Note: The manufacturer may use components from different suppliers including display panels, drives or memory sticks with similar specifications.

 

Rating
Date
Model
Weight
Height
Size
Resolution
Best Price
84 %
07/2020
Fujitsu Lifebook U939 i5
i5-8265U, UHD Graphics 620
900 g15 mm13.3"1920x1080
85 %
05/2020
Dynabook Portege X30L-G1331
i5-10210U, UHD Graphics 620
859 g17.9 mm13.3"1920x1080
89 %
03/2020
Dell XPS 13 9300 i5 FHD
i5-1035G1, UHD Graphics G1 (Ice Lake 32 EU)
1.2 kg14.8 mm13.4"1920x1200
90 %
05/2019
Lenovo ThinkPad X390-20Q1S02M00
i5-8265U, UHD Graphics 620
1.3 kg16.9 mm13.3"1920x1080

Case and Equipment - A business laptop with Thunderbolt

Fujitsu Lifebook U939 - maintenance
Fujitsu Lifebook U939 - maintenance

Fujitsu manufactures the case of the Lifebook U939 from a magnesium alloy, which gives the notebook a robust and high-quality impression. The hinges keep the lid tightly in place and offer a 180-degree opening angle. After users have removed all the visible Philips screws from the bottom of the case, the bottom plate can be removed. However, since the working memory is soldered in, they can only replace the storage solution inside.

In addition to a smart card reader, among the available connections there is also a GigabitLAN connection as well as two Thunderbolt 3 ports for users of the Fujitsu Lifebook U939. The Thunderbolt 3 ports offer the freedom to create almost any desired connection when you use the corresponding adapter. There is also an SD card reader that allows you to insert the corresponding storage cards almost completely. Using our Toshiba Exceria Pro SDXC 64 GB UHS-II reference storage card, it achieved very good speeds at 155 MB/s when copying data and 183 MB/s during sequential reads. 

Our test configuration of the Lifebook U939 includes the optional LTE module, which allows download rates of up to 300 Mb/s with its Cat.-6 support and the corresponding network coverage. For wireless connections to local networks, there is a Wi-Fi-5 adapter (802.11-ac). Although it did not reach the high speeds of Wi-Fi 6 (802.11-ax) in our test with the Netgear Nighthawk AX12 reference router, at 653 Mb/s while receiving and 659 Mb/s while sending data, it still did well. 

At 2.1 MP, the webcam of the Lifebook U939 offers a significantly higher resolution than the otherwise, even by more-expensive manufacturers, widely used 0.9 MP in many competing devices. However, indoors in daylight conditions, the result is mediocre, although it is sufficient for the occasional video chat. Under controlled light conditions, the camera is able to reproduce our test chart well. But the recording of the ColorChecker Passport shows that colors are reproduced significantly brighter than they should be.

Size Comparison

311.9 mm / 12.3 inch 217.2 mm / 8.55 inch 16.9 mm / 0.665 inch 1.3 kg2.83 lbs309 mm / 12.2 inch 212 mm / 8.35 inch 17.9 mm / 0.705 inch 859 g1.894 lbs309 mm / 12.2 inch 213 mm / 8.39 inch 15 mm / 0.591 inch 900 g1.984 lbs296 mm / 11.7 inch 199 mm / 7.83 inch 14.8 mm / 0.583 inch 1.2 kg2.62 lbs

Connectivity

Left side: power, 2x Thunderbolt 3, HDMI, 1x USB Type-A 3.1 Gen1, 3.5-mm audio port, smart card reader
Left side: power, 2x Thunderbolt 3, HDMI, 1x USB Type-A 3.1 Gen1, 3.5-mm audio port, smart card reader
Right side: SIM card slot, power button, SD card reader, 1x USB Type-A 3.1 Gen1, GigabitLAN, Kensington lock
Right side: SIM card slot, power button, SD card reader, 1x USB Type-A 3.1 Gen1, GigabitLAN, Kensington lock
SDCardreader Transfer Speed
average JPG Copy Test (av. of 3 runs)
Dell XPS 13 9300 i5 FHD
  (Toshiba Exceria Pro M501 64 GB UHS-II)
157 MB/s ∼100% +1%
Fujitsu Lifebook U939 i5
  (Toshiba Exceria Pro SDXC 64 GB UHS-II)
155 MB/s ∼99%
Lenovo ThinkPad X390-20Q1S02M00
  (Toshiba Exceria Pro M501)
79.1 MB/s ∼50% -49%
Dynabook Portege X30L-G1331
  (Toshiba Exceria Pro M501 64 GB UHS-II)
78.1 MB/s ∼50% -50%
Average of class Subnotebook
  (8 - 195, n=146)
64.9 MB/s ∼41% -58%
maximum AS SSD Seq Read Test (1GB)
Dell XPS 13 9300 i5 FHD
  (Toshiba Exceria Pro M501 64 GB UHS-II)
195.6 MB/s ∼100% +7%
Fujitsu Lifebook U939 i5
  (Toshiba Exceria Pro SDXC 64 GB UHS-II)
183 MB/s ∼94%
Lenovo ThinkPad X390-20Q1S02M00
  (Toshiba Exceria Pro M501)
86.5 MB/s ∼44% -53%
Dynabook Portege X30L-G1331
  (Toshiba Exceria Pro M501 64 GB UHS-II)
85.4 MB/s ∼44% -53%
Average of class Subnotebook
  (17.7 - 251, n=148)
81 MB/s ∼41% -56%
Networking
iperf3 Client (receive) TCP 1 m 4M x10
Dell XPS 13 9300 i5 FHD
Intel Killer Wi-Fi 6 AX1650s
1460 MBit/s ∼100% +124%
Dynabook Portege X30L-G1331
Intel Wi-Fi 6 AX200
1257 (668min - 1414max) MBit/s ∼86% +92%
Average Intel Wireless-AC 9560
  (312 - 1380, n=173)
687 MBit/s ∼47% +5%
Fujitsu Lifebook U939 i5
Intel Wireless-AC 9560
653 (615min - 685max) MBit/s ∼45%
Lenovo ThinkPad X390-20Q1S02M00
Intel Wireless-AC 9560
646 MBit/s ∼44% -1%
iperf3 Client (transmit) TCP 1 m 4M x10
Dynabook Portege X30L-G1331
Intel Wi-Fi 6 AX200
1484 (1301min - 1644max) MBit/s ∼100% +125%
Dell XPS 13 9300 i5 FHD
Intel Killer Wi-Fi 6 AX1650s
906 MBit/s ∼61% +37%
Lenovo ThinkPad X390-20Q1S02M00
Intel Wireless-AC 9560
681 MBit/s ∼46% +3%
Average Intel Wireless-AC 9560
  (309 - 1338, n=172)
673 MBit/s ∼45% +2%
Fujitsu Lifebook U939 i5
Intel Wireless-AC 9560
659 (334min - 679max) MBit/s ∼44%
01002003004005006007008009001000110012001300140015001600Tooltip
Fujitsu Lifebook U939 i5 Intel Core i5-8265U, Intel UHD Graphics 620; iperf3 Client (receive) TCP 1 m 4M x10; iperf 3.1.3: Ø653 (615-685)
Dynabook Portege X30L-G1331 Intel Core i5-10210U, Intel UHD Graphics 620; iperf3 Client (receive) TCP 1 m 4M x10; iperf 3.1.3: Ø1256 (668-1414)
Fujitsu Lifebook U939 i5 Intel Core i5-8265U, Intel UHD Graphics 620; iperf3 Client (transmit) TCP 1 m 4M x10; iperf 3.1.3: Ø648 (334-679)
Dynabook Portege X30L-G1331 Intel Core i5-10210U, Intel UHD Graphics 620; iperf3 Client (transmit) TCP 1 m 4M x10; iperf 3.1.3: Ø1484 (1301-1644)
ColorChecker
11.5 ∆E
13.8 ∆E
17.5 ∆E
10.9 ∆E
15.9 ∆E
10.5 ∆E
10.3 ∆E
20.5 ∆E
16.7 ∆E
10.2 ∆E
8.2 ∆E
7.2 ∆E
12.1 ∆E
9.8 ∆E
21.2 ∆E
6.3 ∆E
16.3 ∆E
13.4 ∆E
7.5 ∆E
6 ∆E
8.2 ∆E
6.6 ∆E
4 ∆E
6.9 ∆E
ColorChecker Fujitsu Lifebook U939 i5: 11.31 ∆E min: 3.96 - max: 21.18 ∆E

Input Devices - A spongy backlit keyboard

The keyboard of the Lifebook U939 offers a relatively soft feedback while typing. This takes some longer time of getting used to before typing tasks can be accomplished smoothly. In terms of the layout, the manufacturer places the often-used special keys as separate keys, making keys such as Home, End, Insert, and Delete quickly and easily accessible. A two-step illumination also ensures easy readability of the key labels even in bad light conditions.

A classic touchpad with separate keys serves as the mouse replacement. It sits tightly in its frame and responds to inputs promptly. However, the relatively high surface resistance makes drag-and-drop movements slightly more difficult. The two mouse keys respond to input with a clear pressure point and a hollow clicking sound.

Fujitsu Lifebook U939 - input devices
Fujitsu Lifebook U939 - input devices
Fujitsu Lifebook U939 - illumination
Fujitsu Lifebook U939 - illumination

Display - A 13-inch notebook with good brightness

Subpixel grid
Subpixel grid

The display of the Lifebook U939 consists of a 13.3-inch IPS panel, offering a resolution of 1920x1080 pixels. While at 362 cd/m² the average brightness does not reach the levels of the Dell XPS 13 9300, for example, it is still sufficient enough to display the image content easily readable. At t 90%, the brightness distribution of the Fujitsu notebook is at the level of the competitors.

Our measurements also show that the manufacturer uses PWM for brightness control. At brightness levels below 30%, the display starts to flicker at a frequency of 212 Hz. However, since this effect only occurs at very low brightness levels, users with sensitive eyes don't necessarily have to worry about problems when working with the Lifebook U939.

345
cd/m²
346
cd/m²
352
cd/m²
367
cd/m²
384
cd/m²
372
cd/m²
352
cd/m²
376
cd/m²
363
cd/m²
Distribution of brightness
Sharp SHP14BD
X-Rite i1Pro 2
Maximum: 384 cd/m² Average: 361.9 cd/m² Minimum: 20.5 cd/m²
Brightness Distribution: 90 %
Center on Battery: 383 cd/m²
Contrast: 1239:1 (Black: 0.31 cd/m²)
ΔE Color 4.8 | 0.6-29.43 Ø5.8, calibrated: 1.4
ΔE Greyscale 6.6 | 0.64-98 Ø6
95% sRGB (Argyll 3D) 61.2% AdobeRGB 1998 (Argyll 3D)
Gamma: 2.2
Fujitsu Lifebook U939 i5
Sharp SHP14BD, IPS, 1920x1080, 13.3
Dynabook Portege X30L-G1331
Toshiba TOS508F, IPS, 1920x1080, 13.3
Dell XPS 13 9300 i5 FHD
SHP14CB, IPS, 1920x1200, 13.4
Lenovo ThinkPad X390-20Q1S02M00
LP133WF7-SPB1, IPS LED, 1920x1080, 13.3
Response Times
3706%
353%
-10%
Response Time Grey 50% / Grey 80% *
55.2 (26.8, 28.4)
54.8 (26, 28.8)
1%
60 (28.4, 31.6)
-9%
57.6 (28.4, 29.2)
-4%
Response Time Black / White *
29.6 (10.8, 18.8)
35.6 (19.2, 16.4)
-20%
33.2 (16.4, 16.8)
-12%
34 (18.4, 15.6)
-15%
PWM Frequency
211.9 (30)
23810 (24)
11136%
2500 (20)
1080%
Screen
22%
24%
21%
Brightness middle
384
482
26%
619
61%
356
-7%
Brightness
362
452
25%
591
63%
336
-7%
Brightness Distribution
90
91
1%
91
1%
88
-2%
Black Level *
0.31
0.4
-29%
0.35
-13%
0.16
48%
Contrast
1239
1205
-3%
1769
43%
2225
80%
Colorchecker DeltaE2000 *
4.8
1.85
61%
3
37%
3.6
25%
Colorchecker DeltaE2000 max. *
9.4
3.08
67%
8.2
13%
5.5
41%
Colorchecker DeltaE2000 calibrated *
1.4
1.2
14%
1
29%
1.1
21%
Greyscale DeltaE2000 *
6.6
2
70%
5.2
21%
4.7
29%
Gamma
2.2 100%
2.1 105%
2.14 103%
2.48 89%
CCT
7999 81%
6822 95%
6340 103%
6374 102%
Color Space (Percent of AdobeRGB 1998)
61.2
62.5
2%
66.9
9%
61.3
0%
Color Space (Percent of sRGB)
95
97.7
3%
99.3
5%
95.7
1%
Total Average (Program / Settings)
1864% / 811%
189% / 95%
6% / 16%

* ... smaller is better

Display Response Times

Display response times show how fast the screen is able to change from one color to the next. Slow response times can lead to afterimages and can cause moving objects to appear blurry (ghosting). Gamers of fast-paced 3D titles should pay special attention to fast response times.
       Response Time Black to White
29.6 ms ... rise ↗ and fall ↘ combined↗ 10.8 ms rise
↘ 18.8 ms fall
The screen shows relatively slow response rates in our tests and may be too slow for gamers.
In comparison, all tested devices range from 0.8 (minimum) to 240 (maximum) ms. » 71 % of all devices are better.
This means that the measured response time is worse than the average of all tested devices (24.4 ms).
       Response Time 50% Grey to 80% Grey
55.2 ms ... rise ↗ and fall ↘ combined↗ 26.8 ms rise
↘ 28.4 ms fall
The screen shows slow response rates in our tests and will be unsatisfactory for gamers.
In comparison, all tested devices range from 0.8 (minimum) to 636 (maximum) ms. » 90 % of all devices are better.
This means that the measured response time is worse than the average of all tested devices (38.7 ms).

Screen Flickering / PWM (Pulse-Width Modulation)

To dim the screen, some notebooks will simply cycle the backlight on and off in rapid succession - a method called Pulse Width Modulation (PWM) . This cycling frequency should ideally be undetectable to the human eye. If said frequency is too low, users with sensitive eyes may experience strain or headaches or even notice the flickering altogether.
Screen flickering / PWM detected 211.9 Hz ≤ 30 % brightness setting

The display backlight flickers at 211.9 Hz (Likely utilizing PWM) Flickering detected at a brightness setting of 30 % and below. There should be no flickering or PWM above this brightness setting.

The frequency of 211.9 Hz is relatively low, so sensitive users will likely notice flickering and experience eyestrain at the stated brightness setting and below.

In comparison: 51 % of all tested devices do not use PWM to dim the display. If PWM was detected, an average of 9599 (minimum: 5 - maximum: 142900) Hz was measured.

Color-space coverage (sRGB): 95%
Color-space coverage (sRGB): 95%
Color-space coverage (AdobeRGB): 61.2%
Color-space coverage (AdobeRGB): 61.2%

With a color-space coverage of 95% in the sRGB and 61.2% in the AdobeRGB color space, the Lifebook U939 is unable to move ahead of our selected competitors. However, it still delivers very good values. In combination with a contrast ratio of 1239:1, colors are displayed very well delimited, and due to the black value of 0.31 cd/m², which is only slightly elevated, black image contents still appear dark and saturated.

The CalMAN analysis also shows that colors are reproduced with a blue tint. However, this problem can be corrected by calibration and thus completely remedied. You can download the corresponding ICC file from the link in the window above, on the right side of the schematics on the brightness distribution. 

The matte display of the Fujitsu Lifebook U939 is very well suited for work outdoors. The image contents can be easily read even in direct sunlight. In addition, the viewing angles of the IPS panel are very stable, and only when the brightness is adjusted very high, does it show a hardly noticeable slight screen bleeding. 

CalMAN - Color Accuracy
CalMAN - Color Accuracy
CalMAN - Grayscale
CalMAN - Grayscale
CalMAN - Saturation
CalMAN - Saturation
CalMAN - Color Accuracy (calibrated)
CalMAN - Color Accuracy (calibrated)
CalMAN - Grayscale (calibrated)
CalMAN - Grayscale (calibrated)
CalMAN - Saturation (calibrated)
CalMAN - Saturation (calibrated)
Fujitsu Lifebook U939 - using it outdoors
Fujitsu Lifebook U939 - using it outdoors
Fujitsu Lifebook U939 - screen-bleeding
Fujitsu Lifebook U939 - screen-bleeding
Fujitsu Lifebook U939 - viewing-angle stability
Fujitsu Lifebook U939 - viewing-angle stability

Performance - Whiskey Lake in the Fujitsu Lifebook U939

Fujitsu targets business users with the Lifebook U939, and all of the configurations offer sufficient performance for multiple office tasks. However, due to its limitation in using the internal graphics unit of the CPU, users should refrain from tasks that pose high demands on the graphics. While our test unit still uses the processors of Intel's Whiskey Lake generation, starting in July, the current Comet Lake CPUs should also become available.

Processor

The Intel Core i5-8265U used here is a quad-core processor with clock speeds between 1.6 and 3.9 GHz. How long high clock speed frequencies can be maintained depends to a large extent on the cooling system. Our Cinebench-R15 constant load test shows that the CPU is able to offer a slightly higher performance for a short time period. Under load, we measure a relatively small performance drop of about 4%.

0102030405060708090100110120130140150160170180190200210220230240250260270280290300310320330340350360370380390400410420430440450460470480490500510520530540550560570580590600610620630640650660670680690Tooltip
Fujitsu Lifebook U939 i5 Intel Core i5-8265U, Intel Core i5-8265U: Ø487 (483.93-509.34)
Dynabook Portege X30L-G1331 Intel Core i5-10210U, Intel Core i5-10210U: Ø479 (475.43-482.26)
Dell XPS 13 9300 i5 FHD Intel Core i5-1035G1, Intel Core i5-1035G1; Ultra-Performance: Ø526 (443.49-666.89)
Dell XPS 13 9300 i5 FHD Intel Core i5-1035G1, Intel Core i5-1035G1; Optimized: Ø528 (367.46-659.7)
Lenovo ThinkPad X390-20Q1S02M00 Intel Core i5-8265U, Intel Core i5-8265U: Ø569 (552-686)

In the CPU-heavy benchmarks, the results of the Lifebook U939 remain slightly below the average of the other devices with this CPU we tested. For example, the Lenovo ThinkPad X390 with the Intel Core i5-8265U delivers a performance that is up to 35% higher in the Cinebench-R15 Multi-Core test.

Cinebench R20: CPU (Single Core) | CPU (Multi Core)
Cinebench R15: CPU Single 64Bit | CPU Multi 64Bit
Blender 2.79: BMW27 CPU
7-Zip 18.03: 7z b 4 -mmt1 | 7z b 4
Geekbench 5.1 / 5.2: 64 Bit Single-Core Score | 64 Bit Multi-Core Score
HWBOT x265 Benchmark v2.2: 4k Preset
LibreOffice : 20 Documents To PDF
R Benchmark 2.5: Overall mean
Cinebench R20 / CPU (Single Core) - CPU (Single Core)
Dell XPS 13 9300 i5 FHD
Intel Core i5-1035G1
425 Points ∼100% +14%
Dynabook Portege X30L-G1331
Intel Core i5-10210U
412 Points ∼97% +10%
Average Intel Core i5-8265U
  (325 - 403, n=15)
389 Points ∼92% +4%
Fujitsu Lifebook U939 i5
Intel Core i5-8265U
374 Points ∼88%
Average of class Subnotebook
  (73 - 583, n=70)
366 Points ∼86% -2%
Cinebench R20 / CPU (Multi Core) - CPU (Multi Core)
Dell XPS 13 9300 i5 FHD
Intel Core i5-1035G1
1533 Points ∼100% +36%
Average Intel Core i5-8265U
  (972 - 1564, n=15)
1267 Points ∼83% +12%
Average of class Subnotebook
  (110 - 2935, n=71)
1239 Points ∼81% +10%
Fujitsu Lifebook U939 i5
Intel Core i5-8265U
1127 Points ∼74%
Dynabook Portege X30L-G1331
Intel Core i5-10210U
1121 Points ∼73% -1%
Cinebench R15 / CPU Single 64Bit - CPU Single 64Bit
Dell XPS 13 9300 i5 FHD
Intel Core i5-1035G1
166 Points ∼100% +4%
Dynabook Portege X30L-G1331
Intel Core i5-10210U
166 Points ∼100% +4%
Fujitsu Lifebook U939 i5
Intel Core i5-8265U
159 Points ∼96%
Lenovo ThinkPad X390-20Q1S02M00
Intel Core i5-8265U
158 Points ∼95% -1%
Average Intel Core i5-8265U
  (111 - 164, n=35)
155 Points ∼93% -3%
Average of class Subnotebook
  (20 - 218, n=329)
122 Points ∼73% -23%
Cinebench R15 / CPU Multi 64Bit - CPU Multi 64Bit
Lenovo ThinkPad X390-20Q1S02M00
Intel Core i5-8265U
686 (552min - 686max) Points ∼100% +35%
Dell XPS 13 9300 i5 FHD
Intel Core i5-1035G1
667 Points ∼97% +31%
Dell XPS 13 9300 i5 FHD
Intel Core i5-1035G1
659 Points ∼96% +29%
Average Intel Core i5-8265U
  (457 - 750, n=38)
592 Points ∼86% +16%
Fujitsu Lifebook U939 i5
Intel Core i5-8265U
509 (485.37min - 509.34max) Points ∼74%
Dynabook Portege X30L-G1331
Intel Core i5-10210U
479 (475.43min - 482.26max) Points ∼70% -6%
Average of class Subnotebook
  (32 - 1287, n=344)
386 Points ∼56% -24%
Blender 2.79 / BMW27 CPU - BMW27 CPU
Average of class Subnotebook
  (4.2 - 6277, n=62)
1224 Seconds * ∼100% -32%
Fujitsu Lifebook U939 i5
Intel Core i5-8265U
925 Seconds * ∼76%
Dynabook Portege X30L-G1331
Intel Core i5-10210U
918 Seconds * ∼75% +1%
Average Intel Core i5-8265U
  (769 - 1098, n=14)
888 Seconds * ∼73% +4%
Dell XPS 13 9300 i5 FHD
Intel Core i5-1035G1
766 Seconds * ∼63% +17%
7-Zip 18.03 / 7z b 4 -mmt1 - 7z b 4 -mmt1
Dynabook Portege X30L-G1331
Intel Core i5-10210U
4415 MIPS ∼100% +10%
Average of class Subnotebook
  (1653 - 15198, n=57)
4093 MIPS ∼93% +2%
Dell XPS 13 9300 i5 FHD
Intel Core i5-1035G1
4087 MIPS ∼93% +2%
Average Intel Core i5-8265U
  (3780 - 4195, n=14)
4052 MIPS ∼92% +1%
Fujitsu Lifebook U939 i5
Intel Core i5-8265U
4000 MIPS ∼91%
7-Zip 18.03 / 7z b 4 - 7z b 4
Dell XPS 13 9300 i5 FHD
Intel Core i5-1035G1
18535 MIPS ∼100% +21%
Average Intel Core i5-8265U
  (13731 - 18802, n=14)
16206 MIPS ∼87% +6%
Average of class Subnotebook
  (2692 - 37081, n=57)
15719 MIPS ∼85% +3%
Dynabook Portege X30L-G1331
Intel Core i5-10210U
15667 MIPS ∼85% +2%
Fujitsu Lifebook U939 i5
Intel Core i5-8265U
15309 MIPS ∼83%
Geekbench 5.1 / 5.2 / 64 Bit Single-Core Score - 64 Bit Single-Core Score
Dell XPS 13 9300 i5 FHD
Intel Core i5-1035G1
1229 Points ∼100% +17%
Dynabook Portege X30L-G1331
Intel Core i5-10210U
1096 Points ∼89% +5%
Fujitsu Lifebook U939 i5
Intel Core i5-8265U
1047 Points ∼85%
Average Intel Core i5-8265U
  (1040 - 1047, n=3)
1043 Points ∼85% 0%
Average of class Subnotebook
  (310 - 1575, n=53)
1001 Points ∼81% -4%
Geekbench 5.1 / 5.2 / 64 Bit Multi-Core Score - 64 Bit Multi-Core Score
Dell XPS 13 9300 i5 FHD
Intel Core i5-1035G1
4372 Points ∼100% +23%
Dynabook Portege X30L-G1331
Intel Core i5-10210U
3576 Points ∼82% 0%
Fujitsu Lifebook U939 i5
Intel Core i5-8265U
3568 Points ∼82%
Average Intel Core i5-8265U
  (3442 - 3681, n=3)
3564 Points ∼82% 0%
Average of class Subnotebook
  (591 - 5926, n=53)
3205 Points ∼73% -10%
HWBOT x265 Benchmark v2.2 / 4k Preset - 4k Preset
Dell XPS 13 9300 i5 FHD
Intel Core i5-1035G1
4.27 fps ∼100% +7%
Average Intel Core i5-8265U
  (3.38 - 4.8, n=14)
4.2 fps ∼98% +5%
Average of class Subnotebook
  (0.63 - 8.33, n=57)
4.05 fps ∼95% +1%
Dynabook Portege X30L-G1331
Intel Core i5-10210U
4.01 fps ∼94% 0%
Fujitsu Lifebook U939 i5
Intel Core i5-8265U
4 fps ∼94%
LibreOffice / 20 Documents To PDF - 20 Documents To PDF
Average of class Subnotebook
  (32.3 - 281, n=42)
83 s ∼100% +37%
Average Intel Core i5-8265U
  (59.4 - 67.8, n=3)
62.6 s ∼75% +3%
Fujitsu Lifebook U939 i5
Intel Core i5-8265U
60.7 s ∼73%
Dynabook Portege X30L-G1331
Intel Core i5-10210U
60.6 s ∼73% 0%
Dell XPS 13 9300 i5 FHD
Intel Core i5-1035G1
0.02 s ∼0% -100%
R Benchmark 2.5 / Overall mean - Overall mean
Average of class Subnotebook
  (0.554 - 2.43, n=46)
0.886 sec * ∼100% -21%
Fujitsu Lifebook U939 i5
Intel Core i5-8265U
0.73 sec * ∼82%
Average Intel Core i5-8265U
  (0.72 - 0.736, n=3)
0.729 sec * ∼82% -0%
Dell XPS 13 9300 i5 FHD
Intel Core i5-1035G1
0.722 sec * ∼81% +1%
Dynabook Portege X30L-G1331
Intel Core i5-10210U
0.704 sec * ∼79% +4%

* ... smaller is better

Cinebench R15 CPU Multi 64Bit
509 Points
Cinebench R15 OpenGL 64Bit
51.5 fps
Cinebench R15 Ref. Match 64Bit
97.8 %
Cinebench R15 CPU Single 64Bit
159 Points
Help

System Performance

In the PCMark-10 test for system performance, the Fujitsu Lifebook U939 is able to fulfill our expectations. The large amount of working memory in the dual-channel configuration and the fast Samsung SSD are to a large extent responsible for a very smooth system operation. During our testing, the Windows laptop always ran very smoothly, offering a high performance, and it did not show any micro stutters or any similar problems at any time.

You can find out about the performance of other laptops in our tests in our CPU benchmark list.

PCMark 10
Digital Content Creation
Dell XPS 13 9300 i5 FHD
UHD Graphics G1 (Ice Lake 32 EU), i5-1035G1, Toshiba XG6 KXG60ZNV512G
3281 Points ∼25% +13%
Lenovo ThinkPad X390-20Q1S02M00
UHD Graphics 620, i5-8265U, Intel SSD Pro 7600p SSDPEKKF512G8L
3050 Points ∼24% +5%
Dynabook Portege X30L-G1331
UHD Graphics 620, i5-10210U, Samsung SSD PM981a MZVLB512HBJQ
2980 Points ∼23% +3%
Average Intel Core i5-8265U, Intel UHD Graphics 620
  (2067 - 3210, n=29)
2917 Points ∼23% +1%
Fujitsu Lifebook U939 i5
UHD Graphics 620, i5-8265U, Samsung SSD PM981 MZVLB512HAJQ
2891 Points ∼22%
Average of class Subnotebook
  (405 - 4905, n=143)
2690 Points ∼21% -7%
Productivity
Dynabook Portege X30L-G1331
UHD Graphics 620, i5-10210U, Samsung SSD PM981a MZVLB512HBJQ
7317 Points ∼70% +16%
Dell XPS 13 9300 i5 FHD
UHD Graphics G1 (Ice Lake 32 EU), i5-1035G1, Toshiba XG6 KXG60ZNV512G
6766 Points ∼65% +8%
Fujitsu Lifebook U939 i5
UHD Graphics 620, i5-8265U, Samsung SSD PM981 MZVLB512HAJQ
6287 Points ∼60%
Lenovo ThinkPad X390-20Q1S02M00
UHD Graphics 620, i5-8265U, Intel SSD Pro 7600p SSDPEKKF512G8L
6273 Points ∼60% 0%
Average Intel Core i5-8265U, Intel UHD Graphics 620
  (2941 - 6556, n=29)
6061 Points ∼58% -4%
Average of class Subnotebook
  (1014 - 7676, n=143)
5421 Points ∼52% -14%
Essentials
Dynabook Portege X30L-G1331
UHD Graphics 620, i5-10210U, Samsung SSD PM981a MZVLB512HBJQ
9335 Points ∼81% +17%
Dell XPS 13 9300 i5 FHD
UHD Graphics G1 (Ice Lake 32 EU), i5-1035G1, Toshiba XG6 KXG60ZNV512G
8568 Points ∼75% +8%
Lenovo ThinkPad X390-20Q1S02M00
UHD Graphics 620, i5-8265U, Intel SSD Pro 7600p SSDPEKKF512G8L
7982 Points ∼70% 0%
Fujitsu Lifebook U939 i5
UHD Graphics 620, i5-8265U, Samsung SSD PM981 MZVLB512HAJQ
7966 Points ∼70%
Average Intel Core i5-8265U, Intel UHD Graphics 620
  (5073 - 8689, n=29)
7833 Points ∼68% -2%
Average of class Subnotebook
  (2062 - 10113, n=143)
7164 Points ∼63% -10%
Score
Dynabook Portege X30L-G1331
UHD Graphics 620, i5-10210U, Samsung SSD PM981a MZVLB512HBJQ
4217 Points ∼52% +12%
Dell XPS 13 9300 i5 FHD
UHD Graphics G1 (Ice Lake 32 EU), i5-1035G1, Toshiba XG6 KXG60ZNV512G
4122 Points ∼51% +10%
Lenovo ThinkPad X390-20Q1S02M00
UHD Graphics 620, i5-8265U, Intel SSD Pro 7600p SSDPEKKF512G8L
3832 Points ∼47% +2%
Fujitsu Lifebook U939 i5
UHD Graphics 620, i5-8265U, Samsung SSD PM981 MZVLB512HAJQ
3764 Points ∼46%
Average Intel Core i5-8265U, Intel UHD Graphics 620
  (2247 - 3985, n=29)
3705 Points ∼46% -2%
Average of class Subnotebook
  (743 - 4972, n=146)
3342 Points ∼41% -11%
PCMark 10 Score
3764 points
Help

DPC Latencies

Our Lifebook U939 test unit does not show any elevated latencies, which makes it well-suited for application tasks such as real-time audio.

LatencyMon - statistics
LatencyMon - statistics
LatencyMon - drivers
LatencyMon - drivers
DPC Latencies / LatencyMon - interrupt to process latency (max), Web, Youtube, Prime95
Dynabook Portege X30L-G1331
UHD Graphics 620, i5-10210U, Samsung SSD PM981a MZVLB512HBJQ
2107.5 μs * ∼100% -175%
Dell XPS 13 9300 i5 FHD
UHD Graphics G1 (Ice Lake 32 EU), i5-1035G1, Toshiba XG6 KXG60ZNV512G
1368 μs * ∼65% -78%
Fujitsu Lifebook U939 i5
UHD Graphics 620, i5-8265U, Samsung SSD PM981 MZVLB512HAJQ
766.5 μs * ∼36%

* ... smaller is better

Storage Solution

The SSD built into the Lifebook U939 delivers very good read and write rates in our test. With this, it is able to move ahead of the rest of our comparison devices and the drive contributes to a smooth system operation.

You can find out about the performance of other storage solutions in our HDD/SSD benchmark list.

Fujitsu Lifebook U939 i5
Samsung SSD PM981 MZVLB512HAJQ
Dynabook Portege X30L-G1331
Samsung SSD PM981a MZVLB512HBJQ
Dell XPS 13 9300 i5 FHD
Toshiba XG6 KXG60ZNV512G
Lenovo ThinkPad X390-20Q1S02M00
Intel SSD Pro 7600p SSDPEKKF512G8L
Average Samsung SSD PM981 MZVLB512HAJQ
 
Average of class Subnotebook
 
CrystalDiskMark 5.2 / 6
14%
4%
-3%
-1%
-24%
Write 4K
159
164.1
3%
121.88
-23%
120.7
-24%
127 (90.4 - 176, n=64)
-20%
102 (3.23 - 196, n=148)
-36%
Read 4K
48.12
49.34
3%
50.01
4%
58.52
22%
44 (28 - 61.3, n=63)
-9%
61.4 (5.37 - 3738, n=148)
28%
Write Seq
1657
1777
7%
1497.33
-10%
1491
-10%
1617 (112 - 2730, n=62)
-2%
974 (37.3 - 2730, n=147)
-41%
Read Seq
1522
1752
15%
2110.65
39%
2760
81%
1716 (501 - 2665, n=62)
13%
1218 (142 - 2760, n=147)
-20%
Write 4K Q32T1
349.2
401.1
15%
365.85
5%
237.5
-32%
413 (198 - 1707, n=64)
18%
304 (3.6 - 868, n=148)
-13%
Read 4K Q32T1
452.2
498.7
10%
384.57
-15%
336.1
-26%
420 (230 - 1015, n=64)
-7%
343 (9.66 - 1580, n=148)
-24%
Write Seq Q32T1
1941
2988
54%
2748.2
42%
1512
-22%
2076 (1714 - 2994, n=64)
7%
1162 (16.7 - 3007, n=148)
-40%
Read Seq Q32T1
3510
3544
1%
3119.1
-11%
3154
-10%
3130 (1772 - 3565, n=64)
-11%
1992 (113 - 3569, n=148)
-43%
Write 4K Q8T8
1065.2
1264 (369 - 1814, n=13)
626 (12.4 - 1283, n=16)
Read 4K Q8T8
890.5
1193 (527 - 1620, n=13)
665 (31.7 - 1172, n=16)
AS SSD
-11%
-25%
-8%
-25%
-481%
Score Total
3887
4908
26%
3189
-18%
3095
-20%
3966 (2348 - 5316, n=62)
2%
1507 (28 - 5191, n=296)
-61%
Score Write
1618
2065
28%
1455
-10%
1328
-18%
1780 (147 - 2992, n=62)
10%
550 (8 - 2379, n=296)
-66%
Score Read
1523
1864
22%
1180
-23%
1198
-21%
1451 (752 - 2125, n=62)
-5%
641 (12 - 2339, n=296)
-58%
Access Time Write *
0.026
0.091
-250%
0.033
-27%
0.024
8%
0.0834 (0.025 - 2.52, n=62)
-221%
0.796 (0.021 - 30.3, n=359)
-2962%
Access Time Read *
0.044
0.048
-9%
0.085
-93%
0.037
16%
0.0509 (0.029 - 0.103, n=62)
-16%
0.826 (0.04 - 23, n=352)
-1777%
4K-64 Write
1290.38
1695.84
31%
1220.39
-5%
1041.48
-19%
1505 (96.2 - 2716, n=62)
17%
347 (0.22 - 2105, n=369)
-73%
4K-64 Read
1202.09
1601.42
33%
899.28
-25%
865.4
-28%
1203 (530 - 1823, n=62)
0%
440 (0.41 - 2011, n=369)
-63%
4K Write
145.77
124.61
-15%
120.63
-17%
139.8
-4%
112 (1.76 - 146, n=62)
-23%
67.9 (0.2 - 180, n=369)
-53%
4K Read
53.71
55.85
4%
48.07
-11%
63.84
19%
50.5 (31.7 - 61, n=62)
-6%
27.3 (0.35 - 63.8, n=369)
-49%
Seq Write
1818.87
2443.8
34%
1137
-37%
1462.29
-20%
1637 (487 - 2564, n=62)
-10%
569 (14 - 2564, n=370)
-69%
Seq Read
2676.5
2067.04
-23%
2328
-13%
2688.86
0%
1975 (1030 - 2806, n=62)
-26%
926 (50.5 - 2980, n=370)
-65%
Total Average (Program / Settings)
2% / -1%
-11% / -13%
-6% / -6%
-13% / -15%
-253% / -289%

* ... smaller is better

Samsung SSD PM981 MZVLB512HAJQ
CDM 5/6 Read Seq Q32T1: 3510 MB/s
CDM 5/6 Write Seq Q32T1: 1941 MB/s
CDM 5/6 Read 4K Q32T1: 452.2 MB/s
CDM 5/6 Write 4K Q32T1: 349.2 MB/s
CDM 5 Read Seq: 1522 MB/s
CDM 5 Write Seq: 1657 MB/s
CDM 5/6 Read 4K: 48.12 MB/s
CDM 5/6 Write 4K: 159 MB/s

Constant Performance Reading: DiskSpd Read Loop, Queue Depth 8

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: Ø2318 (1981.62-3228.61)

Graphics Card

The internal Intel UHD Graphics 620 graphics unit is responsible for the display of image content in Fujitsu's Lifebook U939. It shares the working memory with the CPU, benefiting from the dual-channel configuration of the Windows laptop. In the 3DMark 11 benchmark, the performance is exactly on the expected level, allowing it to also perform simple image-processing tasks in everyday operation, for example.

You can find out how the Intel UHD Graphics 620 fares in the comparison with other graphics cards in our GPU benchmark list.

3DMark 11 - 1280x720 Performance GPU
Dell XPS 13 9300 i5 FHD
Intel UHD Graphics G1 (Ice Lake 32 EU), Intel Core i5-1035G1
2578 Points ∼100% +49%
Lenovo ThinkPad X390-20Q1S02M00
Intel UHD Graphics 620, Intel Core i5-8265U
1841 Points ∼71% +6%
Dynabook Portege X30L-G1331
Intel UHD Graphics 620, Intel Core i5-10210U
1800 Points ∼70% +4%
Average Intel UHD Graphics 620
  (1235 - 2006, n=226)
1743 Points ∼68% +1%
Fujitsu Lifebook U939 i5
Intel UHD Graphics 620, Intel Core i5-8265U
1731 Points ∼67%
Average of class Subnotebook
  (230 - 11501, n=415)
1541 Points ∼60% -11%
3DMark 11 Performance
1929 points
Help

Gaming Performance

The Fujitsu Lifebook U939 is only suitable to a limited extent for gaming. The Intel UHD Graphics 620 is only able to smoothly display very old games or those with few demands on the graphics performance.

Our GPU games list tells you what performance to expect from the Intel UHD Graphics 620 in various games.

The Witcher 3 - 1024x768 Low Graphics & Postprocessing
Dell XPS 13 9300 i5 FHD
Intel Core i5-1035G1, Intel UHD Graphics G1 (Ice Lake 32 EU)
35 fps ∼100% +187%
Average of class Subnotebook
  (7.4 - 160, n=87)
33.3 fps ∼95% +173%
Lenovo ThinkPad X390-20Q1S02M00
Intel Core i5-8265U, Intel UHD Graphics 620
16.9 fps ∼48% +39%
Average Intel UHD Graphics 620
  (9.59 - 20.7, n=56)
15.9 fps ∼45% +30%
Fujitsu Lifebook U939 i5
Intel Core i5-8265U, Intel UHD Graphics 620
12.2 fps ∼35%
X-Plane 11.11
1920x1080 med (fps_test=2)
Average of class Subnotebook
  (3.42 - 71.5, n=54)
20.6 fps ∼100% +49%
Dynabook Portege X30L-G1331
Intel Core i5-10210U, Intel UHD Graphics 620
14.9 fps ∼72% +8%
Dell XPS 13 9300 i5 FHD
Intel Core i5-1035G1, Intel UHD Graphics G1 (Ice Lake 32 EU)
14.7 fps ∼71% +7%
Fujitsu Lifebook U939 i5
Intel Core i5-8265U, Intel UHD Graphics 620
13.8 fps ∼67%
Average Intel UHD Graphics 620
  (7.45 - 22.7, n=69)
13.8 fps ∼67% 0%
1280x720 low (fps_test=1)
Average of class Subnotebook
  (5.04 - 79, n=56)
28.1 fps ∼100% +38%
Dell XPS 13 9300 i5 FHD
Intel Core i5-1035G1, Intel UHD Graphics G1 (Ice Lake 32 EU)
21.9 fps ∼78% +7%
Dynabook Portege X30L-G1331
Intel Core i5-10210U, Intel UHD Graphics 620
21.9 fps ∼78% +7%
Fujitsu Lifebook U939 i5
Intel Core i5-8265U, Intel UHD Graphics 620
20.4 fps ∼73%
Average Intel UHD Graphics 620
  (8.45 - 31.1, n=70)
19 fps ∼68% -7%
Dota 2 Reborn
1920x1080 high (2/3)
Average of class Subnotebook
  (6 - 107, n=65)
31 fps ∼100% +57%
Dell XPS 13 9300 i5 FHD
Intel Core i5-1035G1, Intel UHD Graphics G1 (Ice Lake 32 EU)
26.2 (21.1min) fps ∼85% +32%
Dynabook Portege X30L-G1331
Intel Core i5-10210U, Intel UHD Graphics 620
21.1 (19.5min) fps ∼68% +7%
Average Intel UHD Graphics 620
  (15.5 - 23.4, n=76)
20 fps ∼65% +1%
Fujitsu Lifebook U939 i5
Intel Core i5-8265U, Intel UHD Graphics 620
19.8 (18.5min) fps ∼64%
1366x768 med (1/3)
Average of class Subnotebook
  (14.3 - 112, n=67)
51.2 fps ∼100% +20%
Dell XPS 13 9300 i5 FHD
Intel Core i5-1035G1, Intel UHD Graphics G1 (Ice Lake 32 EU)
49.7 (38min) fps ∼97% +17%
Dynabook Portege X30L-G1331
Intel Core i5-10210U, Intel UHD Graphics 620
45.3 (40.2min) fps ∼88% +6%
Average Intel UHD Graphics 620
  (30.6 - 57.1, n=76)
44.3 fps ∼87% +4%
Fujitsu Lifebook U939 i5
Intel Core i5-8265U, Intel UHD Graphics 620
42.6 (37.9min) fps ∼83%
1280x720 min (0/3) fastest
Dell XPS 13 9300 i5 FHD
Intel Core i5-1035G1, Intel UHD Graphics G1 (Ice Lake 32 EU)
83.4 (74min) fps ∼100% +21%
Average of class Subnotebook
  (15.9 - 118, n=67)
72.3 fps ∼87% +4%
Average Intel UHD Graphics 620
  (45.1 - 90, n=76)
72.2 fps ∼87% +4%
Dynabook Portege X30L-G1331
Intel Core i5-10210U, Intel UHD Graphics 620
71.5 (59.3min) fps ∼86% +3%
Fujitsu Lifebook U939 i5
Intel Core i5-8265U, Intel UHD Graphics 620
69.2 (61.2min) fps ∼83%
low med. high ultra
The Witcher 3 (2015) 12.2 fps
Dota 2 Reborn (2015) 69.2 42.6 19.8 17.6 fps
X-Plane 11.11 (2018) 20.4 13.8 12.3 fps

Emissions and Power Management - The keyboard illumination eats the battery life

Noise Emissions

The fan in the Lifebook U939 already turns on occasionally while surfing the Internet, producing an even whir that is not particularly annoying. While the Fujitsu laptop might just barely be quiet enough for noise-sensitive environments, it should be well-suited for everyday work in the office.

Noise Level

Idle
29.8 / 29.8 / 29.8 dB(A)
Load
31.7 / 36.3 dB(A)
  red to green bar
 
 
30 dB
silent
40 dB(A)
audible
50 dB(A)
loud
 
min: dark, med: mid, max: light   Audix TM1, Arta (15 cm distance)   environment noise: 29.8 dB(A)
dB(A) 0102030405060708090Deep BassMiddle BassHigh BassLower RangeMidsHigher MidsLower HighsMid HighsUpper HighsSuper Highs2029.130.933.328.8252628.626.829.13130.135.128.835.74029.231.927.931.45028.228.927.627.5632627.824.823.9802525.423.224.210025.624.425.724.812522.623.12324.316023.722.922.823.120023.222.723.223.325022.422.922.222.431521.921.321.321.84002221.320.721.150022.920.819.920.16302320.419.819.380022.919.819.318.8100023.619.718.318.112502419.51817.6160025.820.417.217.3200026.424.616.816.6250029.218.516.816.5315025.717.216.516.4400021.616.816.316.450001916.316.416.4630018.116.416.416.4800017.116.416.316.41000016.416.316.316.3125001616.116.116.11600015.915.915.916SPL36.331.729.829.7N2.21.51.31.3median 22.9median 19.8median 18median 17.6Delta22.92.62.6hearing rangehide median Fan NoiseFujitsu Lifebook U939 i5

Temperatures

Stress test
Stress test

Our measurements attest surface temperatures of barely below 50 °C (122 °F) for the Fujitsu Lifebook U939 under load. Because the warmest spot is in the center towards the back, the palm rests always remain below the 30-degree mark (86 °F). During our stress test that lasts for about an hour, the core temperatures of the processor briefly rise up to 98 °C (208 °F). The cooling system is able to lower this value to an average of 90 °C (194 °F) until the end of the test. The clock speeds drop to barely 1 GHz, which is significantly below the basic clock speed of 1.6 GHz.

Since our stress test represents an extraordinary load on the system, users do not need to expect any limitations due to too-high temperatures.

Max. Load
 43.8 °C
111 F
46.3 °C
115 F
42.4 °C
108 F
 
 39.3 °C
103 F
41.4 °C
107 F
31 °C
88 F
 
 29.8 °C
86 F
29.5 °C
85 F
27.7 °C
82 F
 
Maximum: 46.3 °C = 115 F
Average: 36.8 °C = 98 F
39.5 °C
103 F
44.9 °C
113 F
42.3 °C
108 F
27.1 °C
81 F
37.9 °C
100 F
39.8 °C
104 F
26.4 °C
80 F
27.8 °C
82 F
27.6 °C
82 F
Maximum: 44.9 °C = 113 F
Average: 34.8 °C = 95 F
Power Supply (max.)  33.6 °C = 92 F | Room Temperature 22.1 °C = 72 F | Voltcraft IR-900
(±) The average temperature for the upper side under maximal load is 36.8 °C / 98 F, compared to the average of 30.7 °C / 87 F for the devices in the class Subnotebook.
(-) The maximum temperature on the upper side is 46.3 °C / 115 F, compared to the average of 35.7 °C / 96 F, ranging from 22 to 57 °C for the class Subnotebook.
(±) The bottom heats up to a maximum of 44.9 °C / 113 F, compared to the average of 39.6 °C / 103 F
(+) In idle usage, the average temperature for the upper side is 24.9 °C / 77 F, compared to the device average of 30.7 °C / 87 F.
(+) The palmrests and touchpad are cooler than skin temperature with a maximum of 29.8 °C / 85.6 F and are therefore cool to the touch.
(±) The average temperature of the palmrest area of similar devices was 28.5 °C / 83.3 F (-1.3 °C / -2.3 F).

Speakers

The speakers of the Lifebook U939 produce a medium volume and a sound spectrum that is dominated by the mids and highs. This is well-suited for voice content, and the occasional consumption of media content is also possible. However, in the long run we recommend external speakers or headphones that can be connected to the Fujitsu laptop using the available 3.5-mm audio port or Bluetooth 5.0.

dB(A) 0102030405060708090Deep BassMiddle BassHigh BassLower RangeMidsHigher MidsLower HighsMid HighsUpper HighsSuper Highs2033.337.22526.832.43128.834.34027.931.55027.626.46324.825.68023.224.610025.725.51252324.416022.830.720023.238.825022.247.631521.351.240020.754.350019.955.563019.860.880019.367.6100018.36712501867.6160017.270.2200016.867.6250016.867.3315016.566400016.367500016.467.4630016.470.1800016.3671000016.364.31250016.153.61600015.943.6SPL29.879.2N1.343.9median 18median 64.3Delta2.611.335.335.132.931.831.83236.535.132.428.93328.936.328.848.32761.52752.924.860.92462.822.763.32269.521.267.82174.82075.919.472.718.97117.770.117.86917.671.817.668.117.671.417.673.717.670.417.571.617.671.617.669.617.459.717.583.630.662.51.5median 69.6median 17.84.62.4hearing rangehide median Pink NoiseFujitsu Lifebook U939 i5Apple MacBook 12 (Early 2016) 1.1 GHz
Frequency diagram (checkboxes can be checked and unchecked to compare devices)
Fujitsu Lifebook U939 i5 audio analysis

(±) | speaker loudness is average but good (79.2 dB)
Bass 100 - 315 Hz
(-) | nearly no bass - on average 27.9% lower than median
(±) | linearity of bass is average (10.4% delta to prev. frequency)
Mids 400 - 2000 Hz
(±) | reduced mids - on average 5.1% lower than median
(+) | mids are linear (6.1% delta to prev. frequency)
Highs 2 - 16 kHz
(+) | balanced highs - only 2.7% away from median
(+) | highs are linear (3.5% delta to prev. frequency)
Overall 100 - 16.000 Hz
(±) | linearity of overall sound is average (24.3% difference to median)
Compared to same class
» 77% of all tested devices in this class were better, 5% similar, 18% worse
» The best had a delta of 8%, average was 20%, worst was 50%
Compared to all devices tested
» 70% of all tested devices were better, 7% similar, 23% worse
» The best had a delta of 3%, average was 21%, worst was 65%

Apple MacBook 12 (Early 2016) 1.1 GHz audio analysis

(+) | speakers can play relatively loud (83.6 dB)
Bass 100 - 315 Hz
(±) | reduced bass - on average 11.3% lower than median
(±) | linearity of bass is average (14.2% delta to prev. frequency)
Mids 400 - 2000 Hz
(+) | balanced mids - only 2.4% away from median
(+) | mids are linear (5.5% delta to prev. frequency)
Highs 2 - 16 kHz
(+) | balanced highs - only 2% away from median
(+) | highs are linear (4.5% delta to prev. frequency)
Overall 100 - 16.000 Hz
(+) | overall sound is linear (9.3% difference to median)
Compared to same class
» 2% of all tested devices in this class were better, 1% similar, 97% worse
» The best had a delta of 8%, average was 20%, worst was 50%
Compared to all devices tested
» 2% of all tested devices were better, 0% similar, 98% worse
» The best had a delta of 3%, average was 21%, worst was 65%

Power Consumption

In our test, the Fujitsu Lifebook U939 shows a maximum power consumption of 51.9 watts. However, this is only a brief power peak that quickly levels out at 34 watts.

During idle operation, the strong influence of the two-step keyboard illumination on the power consumption becomes apparent. With the keyboard illumination deactivated, the maximum idle value is at 6.8 watts. It increases to 7.6 when step 1 is activated and to 9.2 watts with step 2.

Power Consumption
Off / Standbydarklight 0.14 / 0.52 Watt
Idledarkmidlight 3.1 / 5.9 / 9.2 Watt
Load midlight 35.8 / 51.9 Watt
 color bar
Key: min: dark, med: mid, max: light        Metrahit Energy

Battery Life

In our realistic WLAN test, the Lifebook U939 achieves a battery life of 8 h 14 m. With this, it is unable to make use of its 50-Wh battery as efficiently as the rest of the devices in our test field.

Battery Runtime - WiFi Websurfing 1.3
Dell XPS 13 9300 i5 FHD
i5-1035G1, UHD Graphics G1 (Ice Lake 32 EU), 52 Wh
703 min ∼27% +42%
Dynabook Portege X30L-G1331
i5-10210U, UHD Graphics 620, 42 Wh
500 min ∼19% +1%
Lenovo ThinkPad X390-20Q1S02M00
i5-8265U, UHD Graphics 620, 48 Wh
499 min ∼19% +1%
Average of class Subnotebook
  (206 - 991, n=274)
497 min ∼19% +1%
Fujitsu Lifebook U939 i5
i5-8265U, UHD Graphics 620, 50 Wh
494 min ∼19%
Battery Runtime
NBC WiFi Websurfing Battery Test 1.3
8h 14min

Pros

+ very light
+ optional LTE module
+ 2x Thunderbolt 3

Cons

- battery life could be longer
- soft keyboard feedback
- few maintenance options

Verdict - A solid notebook with some small shortcomings

In review: Fujitsu Lifebook U939. Test unit provided by Fujitsu Germany
In review: Fujitsu Lifebook U939. Test unit provided by Fujitsu Germany

With the Lifebook U939, Fujitsu delivers a beautiful, small laptop that mainly scores with its connection equipment. Not only will business users find all the basic ports for their everyday work, but private users will also benefit from the two Thunderbolt 3 ports and an LTE module. The low weight of less than 1 kilogram (<2.2 lb) also makes the small laptop extremely mobile.

While Fujitsu demonstrates its strengths as a manufacturer of business devices with the Lifebook U939, the input devices still need some work.

Unfortunately, the battery life remains slightly below our expectations. While slightly more than 8 hours should allow you to get through the workday without a charger, the power already becomes low on the way home. The otherwise well-rounded Fujitsu notebook also urgently needs some reworking of the keyboard and touchpad. While the latter might still win some fans with its separate mouse keys, the mediocre sliding characteristics of the touchpad surface add some unnecessary difficulties to drag-and-drop movements. But those who get along with this will receive a robust, well-performing, and well-equipped laptop with the purchase of the Lifebook U939.

Fujitsu Lifebook U939 i5 - 07/02/2020 v7
Mike Wobker

Chassis
80 / 98 → 81%
Keyboard
72%
Pointing Device
71%
Connectivity
62 / 75 → 83%
Weight
77 / 20-75 → 100%
Battery
81%
Display
86%
Games Performance
44 / 78 → 56%
Application Performance
85 / 85 → 100%
Temperature
91%
Noise
97%
Audio
70 / 91 → 77%
Camera
37 / 85 → 43%
Average
73%
84%
Subnotebook - Weighted Average

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> Notebook / Laptop Reviews and News > Reviews > Fujitsu Lifebook U939 Laptop Review: A compact business notebook with LTE
Mike Wobker, 2020-07-12 (Update: 2020-07-12)
Mike Wobker
Editor of the original article: Mike Wobker - Editor
I made my first IT walking attempts on a 386 with 4 MB of RAM. After that followed various PCs and notebooks, which I looked after and repaired in my circle of friends and acquaintances. After an apprenticeship as a telecommunications systems engineer and several years of professional experience, I graduated with a bachelor's degree in industrial engineering. Today I live out my fascination for IT, technology and mobile devices by writing test reports. In my free time I like to devote myself to vegan cooking and spend time with my family, which includes a whole range of animal roommates.