Notebookcheck

Lenovo Yoga C940-14IIL Laptop Review: Premium Ice Lake convertible is a strong competitor for the Dell XPS 13

Ice Lake Yoga. Lenovo wants to bring its premium Yoga convertible to the next level, with the help of the latest Ice Lake CPUs from Intel. Compared with the predecessor, Lenovo has not changed much and instead has opted to work on a few weak-points. In our review, this strategy certainly pays off!
Benjamin Herzig, 👁 Andreas Osthoff (translated by Benjamin Herzig),

The Lenovo Yoga 900 series enters in its fifth generation with the Lenovo Yoga C940-14IIL. The premium convertible represents the "top of the line" in terms of Lenovo 2-in-1s for the consumer market. For the first time ever, it contains a 14-inch screen and as one of the first Lenovo laptops, it is powered by the latest Intel Ice Lake processors. Even beyond Lenovo, the Yoga C940 is one of the first laptops with the new 10 nm CPUs that we can test. Another laptop with the new CPUs that we have already tested is the Dell XPS 13 7390 2-in-1. The other comparison devices are listed in the table under the specifications.

Our review unit is neither high nor low end. It contains the Intel Core i7-1065G7, 16 GB of RAM and a 512 GB SSD as well as the FHD screen. This configuration costs €1,700 (~$1875) here in Germany, though it can be had cheaper for about €1,550 (~$1710) if one is a student.

Since Lenovo has carried over the design of the Lenovo Yoga C930 in many ways, this review is just an update. For more in-depth information on the connectivity, design and input devices, we redirect you to our review of the previous model.

Working For Notebookcheck

Are you a techie who knows how to write? Then join our Team! Especially English native speakers welcome!

Currently wanted: 
German-English-Translator - Details here

Lenovo Yoga C940-14IIL (Yoga C940 Series)
Processor
Intel Core i7-1065G7 4 x 1.3 - 3.9 GHz, Ice Lake U
Memory
16384 MB 
, LPDDR4X-3733 soldered
Display
14 inch 16:9, 1920 x 1080 pixel 157 PPI, 10-Punkt, native pen support, LP140WF9-SPE2, IPS LED, glossy: yes, HDR
Storage
Samsung SSD PM981 MZVLB512HAJQ, 512 GB 
, M.2 2280, PCIe NMVe, 436 GB free
Soundcard
Intel Ice Lake-U/Y PCH-LP cAVS
Connections
3 USB 3.1 Gen2, 2 Thunderbolt, 2 DisplayPort, Audio Connections: Kombo-Audio, 1 Fingerprint Reader, Sensors: Accelerometer
Networking
Intel Wi-Fi 6 AX201 (a/b/g/h/n = Wi-Fi 4/ac = Wi-Fi 5/ax = Wi-Fi 6), Bluetooth 5.0
Size
height x width x depth (in mm): 14.95 x 320.3 x 215.6 ( = 0.59 x 12.61 x 8.49 in)
Battery
60 Wh Lithium-Ion
Operating System
Microsoft Windows 10 Home 64 Bit
Camera
Webcam: 720p with Privacy shutter
Additional features
Speakers: 4 x 2 W quad speakers, Keyboard: 6 row Chiclet, Keyboard Light: yes, Lenovo Wacom AES Pen, McAfee LiveSafe, Microsoft Office Trial, Lenovo Pen Settings, Lenovo Vantage, 24 Months Warranty
Weight
1.403 kg ( = 49.49 oz / 3.09 pounds), Power Supply: 357 g ( = 12.59 oz / 0.79 pounds)
Price
1549 Euro
Note: The manufacturer may use components from different suppliers including display panels, drives or memory sticks with similar specifications.

 

#compare_competitor

Rating
Date
Model
Weight
Height
Size
Resolution
Best Price
88 %
10/2019
Lenovo Yoga C940-14IIL
i7-1065G7, Iris Plus Graphics G7 (Ice Lake 64 EU)
1.4 kg14.95 mm14"1920x1080
86 %
10/2019
Dell XPS 13 7390 2-in-1 Core i7
i7-1065G7, Iris Plus Graphics G7 (Ice Lake 64 EU)
1.3 kg13 mm13.4"1920x1200
86 %
09/2019
HP Spectre x360 13-ap0312ng
i7-8565U, UHD Graphics 620
1.3 kg14.7 mm13.3"1920x1080
87 %
10/2018
Lenovo Yoga C930-13IKB 81C4
i5-8550U, UHD Graphics 620
1.4 kg14.9 mm13.9"1920x1080

Changes compared with the Lenovo Yoga C930

Lenovo Yoga C940-14IIL
Lenovo Yoga C940-14IIL

Even though Lenovo has left the design of the Yoga C930 basically unchanged, there are a few minor design changes. For one, the hinge design has been altered and the Yoga C940 sports a large single piece hinge. The pen is still stored at the back of the machine, but Lenovo has removed the spring that released the pen when pressed down – instead, it now has to be pulled out. Also, the Chinese manufacturer has introduced the "reverse notch", which we already know from the Lenovo Yoga S940. Opening the screen is a little bit easier this way.

Size & weight

322 mm / 12.7 inch 227 mm / 8.94 inch 14.9 mm / 0.587 inch 1.4 kg3.04 lbs320.3 mm / 12.6 inch 215.6 mm / 8.49 inch 14.95 mm / 0.589 inch 1.4 kg3.09 lbs308.8 mm / 12.2 inch 217.9 mm / 8.58 inch 14.7 mm / 0.579 inch 1.3 kg2.9 lbs296 mm / 11.7 inch 207 mm / 8.15 inch 13 mm / 0.512 inch 1.3 kg2.93 lbs

Lenovo PC with a basic array of connectors

left: USB 3.1 type A gen 2, 2x Thunderbolt 3, combo audio
left: USB 3.1 type A gen 2, 2x Thunderbolt 3, combo audio
right: power button
right: power button
Networking
iperf3 Client (receive) TCP 1 m 4M x10
HP Spectre x360 13-ap0312ng
Intel Wireless-AC 9560
647 MBit/s ∼100% +2%
Dell XPS 13 7390 2-in-1 Core i7
Intel Killer Wi-Fi 6 AX1650s
640 MBit/s ∼99% +1%
Lenovo Yoga C940-14IIL
Intel Wi-Fi 6 AX201
635 MBit/s ∼98%
Lenovo Yoga C930-13IKB 81C4
Intel Wireless-AC 9260
617 MBit/s ∼95% -3%
Average of class Convertible
  (28.7 - 1454, n=169)
536 MBit/s ∼83% -16%
iperf3 Client (transmit) TCP 1 m 4M x10
Lenovo Yoga C940-14IIL
Intel Wi-Fi 6 AX201
743 MBit/s ∼100%
HP Spectre x360 13-ap0312ng
Intel Wireless-AC 9560
681 MBit/s ∼92% -8%
Lenovo Yoga C930-13IKB 81C4
Intel Wireless-AC 9260
640 MBit/s ∼86% -14%
Average of class Convertible
  (36.4 - 1411, n=169)
533 MBit/s ∼72% -28%
Dell XPS 13 7390 2-in-1 Core i7
Intel Killer Wi-Fi 6 AX1650s
356 MBit/s ∼48% -52%

Lenovo laptop display brighter than the LCD of the Lenovo Yoga C930

subpixel array Lenovo Yoga C940-14IIL
subpixel array Lenovo Yoga C940-14IIL
barely any backlight bleeding (outshined by IPS glow)
barely any backlight bleeding (outshined by IPS glow)

With the Lenovo Yoga C940-14IIL, Lenovo finally brings the screen size up to 14 inches – originally, the flagship Yogas contained 13.3-inch LCDs. With the Lenovo Yoga 910 the screen-size was increased to 13.9 inch to minimize screen bezels. Now, it is a 14-inch screen, though sadly still in the rather narrow 16:9 format – a taller 3:2 or 16:10 screen would probably suit this Lenovo Yoga tablet a lot better.

Buyers of the Yoga laptop have a choice between two glossy IPS touch LCDs with HDR support. As the premium option, there is a 4K UHD LCD (3,840x2,160) with 500 cd/m² of brightness and wider color gamut. Our review unit contains the basic FHD (1,920x1,080 pixel) screen with 400 cd/m² of brightness. Unfortunately, the panel used in our review sample does not reach the promised brightness value. On average, the screen is 363 cd/m² bright. With this measurement, it is at least brighter than the FHD screen of its predecessor of the HP Spectre x360 13. On the other hand, the WUXGA LCD of the new XPS 13 2-in-1 is far brighter.

375
cd/m²
366
cd/m²
374
cd/m²
352
cd/m²
384
cd/m²
355
cd/m²
344
cd/m²
365
cd/m²
353
cd/m²
Distribution of brightness
LP140WF9-SPE2
X-Rite i1Pro 2
Maximum: 384 cd/m² Average: 363.1 cd/m² Minimum: 20.8 cd/m²
Brightness Distribution: 90 %
Center on Battery: 383 cd/m²
Contrast: 2259:1 (Black: 0.17 cd/m²)
ΔE Color 3.5 | 0.6-29.43 Ø5.9, calibrated: 1
ΔE Greyscale 4.6 | 0.64-98 Ø6.1
97.7% sRGB (Argyll 3D) 62% AdobeRGB 1998 (Argyll 3D)
Gamma: 2.32
Lenovo Yoga C940-14IIL
LP140WF9-SPE2, , 1920x1080, 14
Dell XPS 13 7390 2-in-1 Core i7
Sharp LQ134N1, , 1920x1200, 13.4
HP Spectre x360 13-ap0312ng
M133NVF3, , 1920x1080, 13.3
Lenovo Yoga C930-13IKB 81C4
AUO B139HAN03_0, , 1920x1080, 13.9
Response Times
4%
37%
23%
Response Time Grey 50% / Grey 80% *
49.6 (23.6, 26)
47.6 (23.2, 24.4)
4%
29.2 (14, 15.2)
41%
34.4 (18.8, 15.6)
31%
Response Time Black / White *
30 (16.4, 13.6)
29.2 (16, 13.2)
3%
20 (10.8, 9.2)
33%
25.6 (15.6, 10)
15%
PWM Frequency
2500 (25)
1000 (99)
Screen
0%
-44%
-68%
Brightness middle
384
549.8
43%
272
-29%
312
-19%
Brightness
363
520
43%
298
-18%
295
-19%
Brightness Distribution
90
86
-4%
84
-7%
87
-3%
Black Level *
0.17
0.39
-129%
0.39
-129%
0.43
-153%
Contrast
2259
1410
-38%
697
-69%
726
-68%
Colorchecker DeltaE2000 *
3.5
2.12
39%
4.3
-23%
7.6
-117%
Colorchecker DeltaE2000 max. *
5.5
3.66
33%
9
-64%
15.06
-174%
Colorchecker DeltaE2000 calibrated *
1
1.37
-37%
2.4
-140%
1.96
-96%
Greyscale DeltaE2000 *
4.6
2.6
43%
4.4
4%
8.8
-91%
Gamma
2.32 95%
2.3 96%
1.97 112%
2.01 109%
CCT
6884 94%
6884 94%
5825 112%
6874 95%
Color Space (Percent of AdobeRGB 1998)
62
65.4
5%
58.9
-5%
59.1
-5%
Color Space (Percent of sRGB)
97.7
99.7
2%
89.8
-8%
92.3
-6%
Total Average (Program / Settings)
2% / 1%
-4% / -32%
-23% / -54%

* ... smaller is better

colors
colors
saturation
saturation
grey-scale
grey-scale
colors (calibrated)
colors (calibrated)
saturation (calibrated)
saturation (calibrated)
grey-scale (calibrated)
grey-scale (calibrated)

The contrast value of 2259:1 is excellent and better than all the competitors. Color reproduction is very good as well and it can be enhanced by enabling HDR in certain apps, too. Ex-factory, there is a slight blue teint, which we could remove with a calibration. The panel has an appropriate sRGB color gamut coverage of 97.7 %, which enables basic photo editing.

sRGB: 97.7%
sRGB: 97.7%
AdobeRGB: 62%
AdobeRGB: 62%
outdoor (cloudy)
outdoor (cloudy)

Despite the glossy surface, the Yoga C940 can be used outdoors, since the LCD is bright enough. Using it outside however means having to live with annoying reflections and the sun should be avoided completely.

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
30 ms ... rise ↗ and fall ↘ combined↗ 16.4 ms rise
↘ 13.6 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 240 (maximum) ms. » 73 % of all devices are better.
This means that the measured response time is worse than the average of all tested devices (24.7 ms).
       Response Time 50% Grey to 80% Grey
49.6 ms ... rise ↗ and fall ↘ combined↗ 23.6 ms rise
↘ 26 ms fall
The screen shows slow response rates in our tests and will be unsatisfactory for gamers.
In comparison, all tested devices range from 0.9 (minimum) to 636 (maximum) ms. » 81 % of all devices are better.
This means that the measured response time is worse than the average of all tested devices (39.2 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 not detected

In comparison: 50 % of all tested devices do not use PWM to dim the display. If PWM was detected, an average of 18115 (minimum: 5 - maximum: 2500000) Hz was measured.

The viewing-angle stability is – typical for an IPS panel – very good.

viewing-angle picture Lenovo Yoga C940
viewing-angle picture Lenovo Yoga C940

Performance: Ice-Lake convinces in the Lenovo Yoga C940 as well

Buyers of the Lenovo laptop Yoga C940 have the choice between two different processor options: Lenovo offers the Intel Core i5-1035G4 as well as the Intel Core i7-1065G7. The GPU selection is connected to the CPUs. There are two choices: The Intel Iris Plus Graphics G4 (48 EUs) and the Intel Iris Plus Graphics G7 (64 EUs). The soldered LPDDR4X-3733 memory has a capacity of 8 or 16 GB. In terms of storage, the SSD either has a capacity of 512 GB or 1 TB.

CPU-Z
CPU-Z
CPU-Z Caches
CPU-Z Caches
CPU-Z Mainboard
CPU-Z Mainboard
HWiNFO
HWiNFO
LatencyMon
LatencyMon
 

Processor

The Intel Core i7-1065G7 is a brand new quad core processor of the recent Ice Lake generation. This 15-W CPU is manufactured in the new 10 nm process. Its maximum clock-rate sits at 3.9 GHz, the base clock at 1.3 GHz. Comparisons with other processors are possible with our CPU benchmark list.

Ex-factory, the Lenovo Yoga tablet runs in the "Intelligent Cooling" mode. This feature of the Lenovo Vantage app regulates the performance in a dynamic way. Because of this feature, the CPU performance is slightly lower than it could be, which means lower temperatures too. It is possible to deactivate the Intelligent Cooling mode and to enable the performance mode instead. Doing so will result in temperatures of roughly 95 degrees Celsius (~203 degrees Fahrenheit) during the Cinebench loop as well as a higher power limit of 25 W (40 W at the beginning of the first Cinebench iteration).

No matter if the Yoga C940 is running in the Intelligent Cooling mode or the performance mode – the short-term boost performance of the Lenovo Yoga C940-14IIL is worse than the Dell XPS 13 7390 2-in-1 with the same CPU. On the other hand, the performance under continuous load is better, especially in the performance mode. The Lenovo Yoga C930 is clearly slower than its successor.

The CPU performance is not limited in battery mode.

0102030405060708090100110120130140150160170180190200210220230240250260270280290300310320330340350360370380390400410420430440450460470480490500510520530540550560570580590600610620630640650660670680690700710720730740750760770780790800810820830840Tooltip
Lenovo Yoga C940-14IIL Intel Core i7-1065G7, Intel Core i7-1065G7; Performance Mode: Ø702 (693.71-740.11)
Lenovo Yoga C940-14IIL Intel Core i7-1065G7, Intel Core i7-1065G7: Ø672 (659-720)
Dell XPS 13 7390 2-in-1 Core i7 Intel Core i7-1065G7, Intel Core i7-1065G7: Ø672 (632.81-836.68)
HP Spectre x360 13-ap0312ng Intel Core i7-8565U, Intel Core i7-8565U: Ø468 (452.06-534.18)
Lenovo Yoga C930-13IKB 81C4 Intel Core i7-8550U, Intel Core i7-8550U: Ø588 (570.26-651.27)
Cinebench R15
CPU Single 64Bit
Lenovo Yoga C940-14IIL
Intel Core i7-1065G7
179 Points ∼100%
Average Intel Core i7-1065G7
  (149 - 190, n=22)
178 Points ∼99% -1%
Dell XPS 13 7390 2-in-1 Core i7
Intel Core i7-1065G7
174 Points ∼97% -3%
Lenovo Yoga C930-13IKB 81C4
Intel Core i7-8550U
168 Points ∼94% -6%
HP Spectre x360 13-ap0312ng
Intel Core i7-8565U
164 Points ∼92% -8%
Average of class Convertible
  (19 - 197, n=330)
109 Points ∼61% -39%
CPU Multi 64Bit
Dell XPS 13 7390 2-in-1 Core i7
Intel Core i7-1065G7
830 Points ∼100% +12%
Lenovo Yoga C940-14IIL
Intel Core i7-1065G7
740 (min: 693, max: 740) Points ∼89%
Lenovo Yoga C940-14IIL
Intel Core i7-1065G7
720 (min: 659, max: 720) Points ∼87% -3%
Average Intel Core i7-1065G7
  (495 - 836, n=23)
683 Points ∼82% -8%
Lenovo Yoga C930-13IKB 81C4
Intel Core i7-8550U
651 Points ∼78% -12%
HP Spectre x360 13-ap0312ng
Intel Core i7-8565U
538 Points ∼65% -27%
Average of class Convertible
  (33 - 938, n=339)
326 Points ∼39% -56%
Cinebench R15 CPU Multi 64Bit
720 Points
Cinebench R15 OpenGL 64Bit
71 fps
Cinebench R15 Ref. Match 64Bit
98 %
Cinebench R15 CPU Single 64Bit
179 Points
Help

System performance

There is nothing to complain about when it comes to the system performance, neither in the benchmarks nor in everyday use.

PCMark 10
Digital Content Creation
Dell XPS 13 7390 2-in-1 Core i7
Iris Plus Graphics G7 (Ice Lake 64 EU), i7-1065G7, Toshiba BG4 KBG40ZPZ512G
3998 Points ∼100% +3%
Lenovo Yoga C940-14IIL
Iris Plus Graphics G7 (Ice Lake 64 EU), i7-1065G7, Samsung SSD PM981 MZVLB512HAJQ
3900 Points ∼98%
Average Intel Core i7-1065G7, Intel Iris Plus Graphics G7 (Ice Lake 64 EU)
  (3260 - 3998, n=13)
3739 Points ∼94% -4%
HP Spectre x360 13-ap0312ng
UHD Graphics 620, i7-8565U, Toshiba XG5 KXG50ZNV512G
3055 Points ∼76% -22%
Lenovo Yoga C930-13IKB 81C4
UHD Graphics 620, i5-8550U, SK hynix PC401 HFS256GD9TNG
3033 Points ∼76% -22%
Average of class Convertible
  (605 - 4472, n=126)
2568 Points ∼64% -34%
Productivity
Dell XPS 13 7390 2-in-1 Core i7
Iris Plus Graphics G7 (Ice Lake 64 EU), i7-1065G7, Toshiba BG4 KBG40ZPZ512G
7179 Points ∼100% +4%
Lenovo Yoga C940-14IIL
Iris Plus Graphics G7 (Ice Lake 64 EU), i7-1065G7, Samsung SSD PM981 MZVLB512HAJQ
6924 Points ∼96%
Average Intel Core i7-1065G7, Intel Iris Plus Graphics G7 (Ice Lake 64 EU)
  (5518 - 7379, n=13)
6794 Points ∼95% -2%
HP Spectre x360 13-ap0312ng
UHD Graphics 620, i7-8565U, Toshiba XG5 KXG50ZNV512G
6774 Points ∼94% -2%
Lenovo Yoga C930-13IKB 81C4
UHD Graphics 620, i5-8550U, SK hynix PC401 HFS256GD9TNG
6505 Points ∼91% -6%
Average of class Convertible
  (1121 - 7752, n=128)
5408 Points ∼75% -22%
Essentials
Lenovo Yoga C940-14IIL
Iris Plus Graphics G7 (Ice Lake 64 EU), i7-1065G7, Samsung SSD PM981 MZVLB512HAJQ
9678 Points ∼100%
Dell XPS 13 7390 2-in-1 Core i7
Iris Plus Graphics G7 (Ice Lake 64 EU), i7-1065G7, Toshiba BG4 KBG40ZPZ512G
9678 Points ∼100% 0%
Lenovo Yoga C930-13IKB 81C4
UHD Graphics 620, i5-8550U, SK hynix PC401 HFS256GD9TNG
9291 Points ∼96% -4%
Average Intel Core i7-1065G7, Intel Iris Plus Graphics G7 (Ice Lake 64 EU)
  (8302 - 9902, n=13)
9219 Points ∼95% -5%
HP Spectre x360 13-ap0312ng
UHD Graphics 620, i7-8565U, Toshiba XG5 KXG50ZNV512G
8454 Points ∼87% -13%
Average of class Convertible
  (2489 - 10546, n=128)
7189 Points ∼74% -26%
Score
Dell XPS 13 7390 2-in-1 Core i7
Iris Plus Graphics G7 (Ice Lake 64 EU), i7-1065G7, Toshiba BG4 KBG40ZPZ512G
4677 Points ∼100% +2%
Lenovo Yoga C940-14IIL
Iris Plus Graphics G7 (Ice Lake 64 EU), i7-1065G7, Samsung SSD PM981 MZVLB512HAJQ
4583 Points ∼98%
Average Intel Core i7-1065G7, Intel Iris Plus Graphics G7 (Ice Lake 64 EU)
  (3878 - 4679, n=13)
4416 Points ∼94% -4%
Lenovo Yoga C930-13IKB 81C4
UHD Graphics 620, i5-8550U, SK hynix PC401 HFS256GD9TNG
4072 Points ∼87% -11%
HP Spectre x360 13-ap0312ng
UHD Graphics 620, i7-8565U, Toshiba XG5 KXG50ZNV512G
4009 Points ∼86% -13%
Average of class Convertible
  (872 - 4884, n=129)
3282 Points ∼70% -28%
PCMark 8
Work Score Accelerated v2
HP Spectre x360 13-ap0312ng
UHD Graphics 620, i7-8565U, Toshiba XG5 KXG50ZNV512G
5189 Points ∼100% +1%
Lenovo Yoga C940-14IIL
Iris Plus Graphics G7 (Ice Lake 64 EU), i7-1065G7, Samsung SSD PM981 MZVLB512HAJQ
5158 Points ∼99%
Lenovo Yoga C930-13IKB 81C4
UHD Graphics 620, i5-8550U, SK hynix PC401 HFS256GD9TNG
5110 Points ∼98% -1%
Dell XPS 13 7390 2-in-1 Core i7
Iris Plus Graphics G7 (Ice Lake 64 EU), i7-1065G7, Toshiba BG4 KBG40ZPZ512G
5086 Points ∼98% -1%
Average Intel Core i7-1065G7, Intel Iris Plus Graphics G7 (Ice Lake 64 EU)
  (2768 - 5291, n=13)
4663 Points ∼90% -10%
Average of class Convertible
  (1007 - 5366, n=251)
3809 Points ∼73% -26%
Home Score Accelerated v2
HP Spectre x360 13-ap0312ng
UHD Graphics 620, i7-8565U, Toshiba XG5 KXG50ZNV512G
4166 Points ∼100% +4%
Lenovo Yoga C940-14IIL
Iris Plus Graphics G7 (Ice Lake 64 EU), i7-1065G7, Samsung SSD PM981 MZVLB512HAJQ
4003 Points ∼96%
Dell XPS 13 7390 2-in-1 Core i7
Iris Plus Graphics G7 (Ice Lake 64 EU), i7-1065G7, Toshiba BG4 KBG40ZPZ512G
3982 Points ∼96% -1%
Average Intel Core i7-1065G7, Intel Iris Plus Graphics G7 (Ice Lake 64 EU)
  (3397 - 4030, n=13)
3745 Points ∼90% -6%
Lenovo Yoga C930-13IKB 81C4
UHD Graphics 620, i5-8550U, SK hynix PC401 HFS256GD9TNG
3615 Points ∼87% -10%
Average of class Convertible
  (741 - 4741, n=301)
2838 Points ∼68% -29%
PCMark 8 Home Score Accelerated v2
4003 points
PCMark 8 Work Score Accelerated v2
5158 points
Help

Storage Solution

The single M.2 2280 SSD is made by Samsung. The extremely fast PCIe NVMe SSD PM981 has a capacity of 512 GB. It is faster than the SSDs of all the other convertibles.

Lenovo Yoga C940-14IIL
Samsung SSD PM981 MZVLB512HAJQ
Dell XPS 13 7390 2-in-1 Core i7
Toshiba BG4 KBG40ZPZ512G
HP Spectre x360 13-ap0312ng
Toshiba XG5 KXG50ZNV512G
Lenovo Yoga C930-13IKB 81C4
SK hynix PC401 HFS256GD9TNG
Average Samsung SSD PM981 MZVLB512HAJQ
 
CrystalDiskMark 5.2 / 6
-16%
-26%
-30%
-8%
Write 4K
128.4
106.7
-17%
105.09
-18%
108.7
-15%
127 (90.4 - 176, n=64)
-1%
Read 4K
46.37
49.94
8%
42.3
-9%
40.91
-12%
44 (28 - 61.3, n=63)
-5%
Write Seq
1863
1223
-34%
677.12
-64%
797.5
-57%
1617 (112 - 2730, n=62)
-13%
Read Seq
2340
1801
-23%
2092.32
-11%
1610
-31%
1716 (501 - 2665, n=62)
-27%
Write 4K Q32T1
451.1
325.3
-28%
378.76
-16%
385.1
-15%
413 (198 - 1707, n=64)
-8%
Read 4K Q32T1
415.3
550.5
33%
271.31
-35%
305.8
-26%
420 (230 - 1015, n=64)
1%
Write Seq Q32T1
2985
1224
-59%
527.3
-82%
778.6
-74%
2076 (1714 - 2994, n=64)
-30%
Read Seq Q32T1
2565
2350
-8%
3174.6
24%
2359
-8%
3130 (1772 - 3565, n=64)
22%
Samsung SSD PM981 MZVLB512HAJQ
Sequential Read: 2497 MB/s
Sequential Write: 1888 MB/s
512K Read: 1687 MB/s
512K Write: 1607 MB/s
4K Read: 61.42 MB/s
4K Write: 128.8 MB/s
4K QD32 Read: 395.2 MB/s
4K QD32 Write: 435.8 MB/s

GPU

GPU-Z
GPU-Z

The Intel Iris Plus Graphics G7 is the fastest integrated GPU available in the recent Intel Ice Lake processors. It has 64 executive units, but it does not have its own dedicated memory, different from older Iris GPUs. The performance of this iGPU depends on the main system memory. It has to run in the dual channel mode to bring out the maximum performance of the iGPU – luckily, the memory does run in the dual channel mode in the case of the Lenovo Yoga C940.

Different from the normal Intel UHD Graphics 620, the Iris GPU can be used for modern games, though the graphical details certainly have to be reduced a lot. In terms of pure GPU performance, the Intel Iris GPU is still a little bit slower than the Nvidia GeForce MX250, even though the difference is not huge. The GPU is definitely suitable for some light gaming.

We could not detect any GPU throttling in the battery mode.

3DMark 11 - 1280x720 Performance GPU
Lenovo ThinkPad T490-20N3S02L00
NVIDIA GeForce MX250, Intel Core i7-8565U
4748 Points ∼100% +3%
Lenovo Yoga C940-14IIL
Intel Iris Plus Graphics G7 (Ice Lake 64 EU), Intel Core i7-1065G7
4613 Points ∼97%
Dell XPS 13 7390 2-in-1 Core i7
Intel Iris Plus Graphics G7 (Ice Lake 64 EU), Intel Core i7-1065G7
4594 Points ∼97% 0%
Average Intel Iris Plus Graphics G7 (Ice Lake 64 EU)
  (2924 - 4630, n=19)
4143 Points ∼87% -10%
HP Spectre x360 13-ap0312ng
Intel UHD Graphics 620, Intel Core i7-8565U
1929 Points ∼41% -58%
Lenovo Yoga C930-13IKB 81C4
Intel UHD Graphics 620, Intel Core i7-8550U
1911 Points ∼40% -59%
Average of class Convertible
  (173 - 17421, n=356)
1450 Points ∼31% -69%
3DMark
2560x1440 Time Spy Graphics
Lenovo ThinkPad T490-20N3S02L00
NVIDIA GeForce MX250, Intel Core i7-8565U
1134 Points ∼100% +36%
Lenovo Yoga C940-14IIL
Intel Iris Plus Graphics G7 (Ice Lake 64 EU), Intel Core i7-1065G7
835 Points ∼74%
Dell XPS 13 7390 2-in-1 Core i7
Intel Iris Plus Graphics G7 (Ice Lake 64 EU), Intel Core i7-1065G7
833 Points ∼73% 0%
Average Intel Iris Plus Graphics G7 (Ice Lake 64 EU)
  (526 - 847, n=16)
731 Points ∼64% -12%
Average of class Convertible
  (85 - 5126, n=54)
616 Points ∼54% -26%
1920x1080 Fire Strike Graphics
Lenovo ThinkPad T490-20N3S02L00
NVIDIA GeForce MX250, Intel Core i7-8565U
3863 Points ∼100% +22%
Lenovo Yoga C940-14IIL
Intel Iris Plus Graphics G7 (Ice Lake 64 EU), Intel Core i7-1065G7
3156 Points ∼82%
Dell XPS 13 7390 2-in-1 Core i7
Intel Iris Plus Graphics G7 (Ice Lake 64 EU), Intel Core i7-1065G7
3144 Points ∼81% 0%
Average Intel Iris Plus Graphics G7 (Ice Lake 64 EU)
  (1487 - 3156, n=18)
2649 Points ∼69% -16%
HP Spectre x360 13-ap0312ng
Intel UHD Graphics 620, Intel Core i7-8565U
1401 Points ∼36% -56%
Average of class Convertible
  (132 - 13158, n=264)
1164 Points ∼30% -63%
1280x720 Cloud Gate Standard Graphics
Lenovo ThinkPad T490-20N3S02L00
NVIDIA GeForce MX250, Intel Core i7-8565U
23354 Points ∼100%
Dell XPS 13 7390 2-in-1 Core i7
Intel Iris Plus Graphics G7 (Ice Lake 64 EU), Intel Core i7-1065G7
18881 Points ∼81%
Average Intel Iris Plus Graphics G7 (Ice Lake 64 EU)
  (7045 - 18881, n=17)
15917 Points ∼68%
HP Spectre x360 13-ap0312ng
Intel UHD Graphics 620, Intel Core i7-8565U
11436 Points ∼49%
Lenovo Yoga C930-13IKB 81C4
Intel UHD Graphics 620, Intel Core i7-8550U
10490 Points ∼45%
Average of class Convertible
  (1023 - 38419, n=312)
7328 Points ∼31%
3DMark 11 Performance
4929 points
3DMark Time Spy Score
945 points
Help
The Witcher 3 - 1366x768 Medium Graphics & Postprocessing
Lenovo ThinkPad T490-20N3S02L00
Intel Core i7-8565U, NVIDIA GeForce MX250
36.8 fps ∼100% +3%
Lenovo Yoga C940-14IIL
Intel Core i7-1065G7, Intel Iris Plus Graphics G7 (Ice Lake 64 EU)
35.8 fps ∼97%
Dell XPS 13 7390 2-in-1 Core i7
Intel Core i7-1065G7, Intel Iris Plus Graphics G7 (Ice Lake 64 EU)
34.4 fps ∼93% -4%
Average Intel Iris Plus Graphics G7 (Ice Lake 64 EU)
  (20.8 - 36.8, n=13)
31.9 fps ∼87% -11%
Average of class Convertible
  (3.7 - 111, n=28)
27.3 fps ∼74% -24%
low med. high ultra
BioShock Infinite (2013) 111.9 71.9 61.2 21.7 fps
The Witcher 3 (2015) 56 35.8 18.9 fps
Dota 2 Reborn (2015) 101 60 34.2 29.3 fps
Rainbow Six Siege (2015) 98.2 61.5 33.6 27.7 fps
Rise of the Tomb Raider (2016) 45.7 28.7 15.4 fps
Rocket League (2017) 123 64.8 45.6 fps
X-Plane 11.11 (2018) 42.9 20.7 19.4 fps
Shadow of the Tomb Raider (2018) 29 14 fps
Assassin´s Creed Odyssey (2018) 24 fps
Battlefield V (2018) 43 20.6 17.2 fps
Far Cry New Dawn (2019) 32 17 fps
The Division 2 (2019) 27 fps
Anno 1800 (2019) 41 15.6 fps
Total War: Three Kingdoms (2019) 63.3 13.1 fps
F1 2019 (2019) 35 23 fps

Emissions: Good speakers & not a lot of fan noise or heat

Noise

In terms of noise, the Lenovo Yoga C940-14IIL is very low-key. The fan is permanently shut off when it is idling and it does not get very loud under load. Unfortunately, we did detect coil whine, though it was only audible when an ear was pressed against the keyboard.

Noise Level

Idle
29.3 / 29.3 / 29.3 dB(A)
Load
33.3 / 33.3 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: 29.3 dB(A)
dB(A) 0102030405060708090Deep BassMiddle BassHigh BassLower RangeMidsHigher MidsLower HighsMid HighsUpper HighsSuper Highs2032.932.333.733.92524.927.626.125.43131.928.428.826.84030.327.429.828.15023.822.924.625.76323.22322.4248023.922.921.823.410024.825.22324.412523.122.42322.516022.5222221.920022.72322.921.825023.824.122.722.431521.821.820.521.640021.621.720.321.350020.920.819.120.463020.619.318.820.980020.119.21820.3100021.219.118.120.7125022.318.717.321.5160022.217.916.922200022.517.616.622.2250022.717.516.422.7315022.617.216.122.3400022.116.716.12250002016.51619.9630017.616.31617.6800016.416.215.916.41000015.915.915.715.81250015.615.815.515.61600015.315.515.315.4SPL33.330.229.333.1N1.81.41.21.8median 21.8median 18.7median 17.3median 21.5Delta1.52.722hearing rangehide median Fan NoiseLenovo Yoga C940-14IIL

Temperatures

Stress test (Prime95 + FurMark)
Stress test (Prime95 + FurMark)

With the Intelligent Cooling mode enabled, we measured 44.6 degrees Celsius (~112 degrees Fahrenheit) as the maximum temperature of the outer chassis. That is completely OK for such a thin laptop, especially since the palmrest always stays completely cool. In the stress test, the CPU can consume 40 W at the beginning of the test, reaching 2.4 GHz. After an hour, the power consumption sits at 17 W, which translates into clock-rates of 1.1 GHz. This is TDP throttling, which should not affect everyday use in any way. Also, it only occurs with the Intelligent Cooling mode enabled.

Max. Load
 39.9 °C
104 F
40.5 °C
105 F
41 °C
106 F
 
 36.2 °C
97 F
38.1 °C
101 F
36.1 °C
97 F
 
 29.1 °C
84 F
29.5 °C
85 F
29.2 °C
85 F
 
Maximum: 41 °C = 106 F
Average: 35.5 °C = 96 F
40 °C
104 F
44.6 °C
112 F
37.9 °C
100 F
34.1 °C
93 F
36.9 °C
98 F
33.4 °C
92 F
30.4 °C
87 F
31.1 °C
88 F
30.3 °C
87 F
Maximum: 44.6 °C = 112 F
Average: 35.4 °C = 96 F
Power Supply (max.)  35.2 °C = 95 F | Room Temperature 20.2 °C = 68 F | Voltcraft IR-900
(±) The average temperature for the upper side under maximal load is 35.5 °C / 96 F, compared to the average of 30.3 °C / 87 F for the devices in the class Convertible.
(±) The maximum temperature on the upper side is 41 °C / 106 F, compared to the average of 35.3 °C / 96 F, ranging from 21.8 to 55.7 °C for the class Convertible.
(±) The bottom heats up to a maximum of 44.6 °C / 112 F, compared to the average of 36.5 °C / 98 F
(+) In idle usage, the average temperature for the upper side is 23.6 °C / 74 F, compared to the device average of 30.3 °C / 87 F.
(+) The palmrests and touchpad are cooler than skin temperature with a maximum of 29.5 °C / 85.1 F and are therefore cool to the touch.
(±) The average temperature of the palmrest area of similar devices was 28.9 °C / 84 F (-0.6 °C / -1.1 F).
load (palmrest)
load (palmrest)
load (bottom)
load (bottom)

Speakers

Lenovo has not changed anything about the speaker system with a total of four speakers (two at the bottom, two in the hinge). The speakers still deliver a very good performance and they effortlessly compete with the speakers of the Dell XPS 13 7390 2-in-1.

dB(A) 0102030405060708090Deep BassMiddle BassHigh BassLower RangeMidsHigher MidsLower HighsMid HighsUpper HighsSuper Highs2033.733.52526.126.63128.831.64029.829.95024.630.26322.440.18021.841.81002351.11252353.51602258.820022.963.325022.767.131520.56940020.370.950019.168.563018.869.18001868.5100018.164.8125017.366160016.966.2200016.663.4250016.464.9315016.162.8400016.162.55000165663001652.3800015.947.51000015.746.81250015.546.81600015.341.8SPL29.376.8N1.240.5median 17.3median 63.3Delta27.14144.438.239.33838.136.238.936.837.338.537.236.336.934.945.933.453.533.359.832.361.331.661.530.665.429.96629.663.229.269.728.873.228.27427.670.227.569.827.670.227.265.72756.72761.32762.526.966.426.867.126.87126.66626.761.439.980.73.851.2median 27.6median 65.723.1hearing rangehide median Pink NoiseLenovo Yoga C940-14IILDell XPS 13 7390 2-in-1 Core i7
Frequency diagram (checkboxes can be checked and unchecked to compare devices)
Lenovo Yoga C940-14IIL audio analysis

(±) | speaker loudness is average but good (76.8 dB)
Bass 100 - 315 Hz
(±) | reduced bass - on average 6% lower than median
(±) | linearity of bass is average (9.9% delta to prev. frequency)
Mids 400 - 2000 Hz
(+) | balanced mids - only 3.9% away from median
(+) | mids are linear (3.6% delta to prev. frequency)
Highs 2 - 16 kHz
(±) | reduced highs - on average 7.6% lower than median
(+) | highs are linear (6.1% delta to prev. frequency)
Overall 100 - 16.000 Hz
(±) | linearity of overall sound is average (15% difference to median)
Compared to same class
» 11% of all tested devices in this class were better, 6% similar, 83% worse
» The best had a delta of 11%, average was 22%, worst was 53%
Compared to all devices tested
» 15% of all tested devices were better, 4% similar, 82% worse
» The best had a delta of 3%, average was 21%, worst was 65%

Dell XPS 13 7390 2-in-1 Core i7 audio analysis

(±) | speaker loudness is average but good (80.74 dB)
Bass 100 - 315 Hz
(±) | reduced bass - on average 7.8% lower than median
(±) | linearity of bass is average (12.5% delta to prev. frequency)
Mids 400 - 2000 Hz
(+) | balanced mids - only 4.5% away from median
(+) | mids are linear (6.2% delta to prev. frequency)
Highs 2 - 16 kHz
(+) | balanced highs - only 3.4% away from median
(±) | linearity of highs is average (10.5% delta to prev. frequency)
Overall 100 - 16.000 Hz
(+) | overall sound is linear (12.7% difference to median)
Compared to same class
» 5% of all tested devices in this class were better, 1% similar, 94% worse
» The best had a delta of 11%, average was 22%, worst was 53%
Compared to all devices tested
» 7% of all tested devices were better, 2% similar, 91% worse
» The best had a delta of 3%, average was 21%, worst was 65%

Energy management of the Lenovo computer

Power consumption

There are positive changes when it comes to the power consumption, as it has decreased compared with the predecessor. However, the comparison against the Dell XPS 13 7390 2-in-1 does not bode well for the Lenovo Yoga C940.

Power Consumption
Off / Standbydarklight 0.45 / 0.53 Watt
Idledarkmidlight 3.2 / 7 / 8.9 Watt
Load midlight 47.6 / 63.1 Watt
 color bar
Key: min: dark, med: mid, max: light        Metrahit Energy
Lenovo Yoga C940-14IIL
i7-1065G7, Iris Plus Graphics G7 (Ice Lake 64 EU), Samsung SSD PM981 MZVLB512HAJQ, IPS LED, 1920x1080, 14
Dell XPS 13 7390 2-in-1 Core i7
i7-1065G7, Iris Plus Graphics G7 (Ice Lake 64 EU), Toshiba BG4 KBG40ZPZ512G, IPS, 1920x1200, 13.4
HP Spectre x360 13-ap0312ng
i7-8565U, UHD Graphics 620, Toshiba XG5 KXG50ZNV512G, IPS, 1920x1080, 13.3
Lenovo Yoga C930-13IKB 81C4
i5-8550U, UHD Graphics 620, SK hynix PC401 HFS256GD9TNG, IPS, 1920x1080, 13.9
Average Intel Iris Plus Graphics G7 (Ice Lake 64 EU)
 
Average of class Convertible
 
Power Consumption
19%
4%
-9%
-0%
7%
Idle Minimum *
3.2
2.6
19%
4.32
-35%
3.4
-6%
4.11 (1.8 - 6.9, n=17)
-28%
4.59 (1 - 23, n=405)
-43%
Idle Average *
7
5.3
24%
6.84
2%
7.5
-7%
7.43 (4.6 - 10.5, n=17)
-6%
7.74 (1.3 - 32.3, n=405)
-11%
Idle Maximum *
8.9
7
21%
8.64
3%
11.8
-33%
8.91 (6.1 - 12, n=17)
-0%
9.25 (1.8 - 61, n=405)
-4%
Load Average *
47.6
43.1
9%
31.8
33%
47.7
-0%
40.1 (25.7 - 53.3, n=17)
16%
27.2 (1.4 - 94, n=403)
43%
Load Maximum *
63.1
49
22%
53
16%
63.2
-0%
52.3 (27 - 65.2, n=17)
17%
33.1 (5.9 - 118, n=404)
48%
Witcher 3 ultra *
43.1

* ... smaller is better

Battery life

charging time: 181 minutes
charging time: 181 minutes

The internal battery of the Lenovo Yoga C940-14IIL has a capacity of 60 Wh, which means it is bigger than the ebattery of the Dell XPS 13 7390 2-in-1. Despite the lower power consumption of the Dell XPS 13, the Lenovo Yoga C940 still managed to achieve a better battery life in the Wi-Fi test. With a screen brightness of just 150 cd/m², the Yoga tablet ran for over 10 hours. Repeated with the maximum screen brightness, the Yoga lasted 7.5 hours in the same test.

Battery Runtime
NBC WiFi Websurfing Battery Test 1.3 (Edge)
10h 36min
NBC WiFi Websurfing Battery Test 1.3 max Brightness (Edge)
7h 37min
Big Buck Bunny H.264 1080p
13h 13min
Load (maximum brightness)
1h 04min
Lenovo Yoga C940-14IIL
i7-1065G7, Iris Plus Graphics G7 (Ice Lake 64 EU), 60 Wh
Dell XPS 13 7390 2-in-1 Core i7
i7-1065G7, Iris Plus Graphics G7 (Ice Lake 64 EU), 51 Wh
HP Spectre x360 13-ap0312ng
i7-8565U, UHD Graphics 620, 61 Wh
Lenovo Yoga C930-13IKB 81C4
i5-8550U, UHD Graphics 620, 60 Wh
Average of class Convertible
 
Battery Runtime
-16%
25%
4%
19%
Reader / Idle
792 (117 - 2223, n=303)
H.264
793
643
-19%
460 (206 - 1070, n=123)
-42%
WiFi v1.3
636
537
-16%
531
-17%
664
4%
461 (153 - 1010, n=280)
-28%
Load
64
135
111%
145 (49 - 677, n=302)
127%

Pros

+ higher CPU/GPU performance than predecessor
+ lower temperatures/noise than Yoga C930
+ good battery life
+ premium metal chassis
+ brighter FHD LCD than predecessor
+ integrated stylus

Cons

- not many ports
- difficult to open up
- only glossy LCDs
- screen does not reach promised brightness
- small amount of coil-whine

Verdict

in review: Lenovo Yoga C940-14IIL, review sample supplied by
in review: Lenovo Yoga C940-14IIL, review sample supplied by

Lenovo continues its high-end Yoga line with the Yoga C940-14IIL and has equipped it with the latest Ice Lake processors for the first time. This is a well executed evolutionary update.

Without a doubt, the new Intel Core i7-1065G7 is the heart of the Yoga tablet. In terms of CPU and especially the GPU performance, the new CPU platforms brings a huge improvement in performance, which makes the Yoga C940 even suitable for light gaming. This was accomplished without an increase in heat or noise – on the contrary, there is a decrease in both areas. The battery life continues to be good. Compared with the Yoga C930, there is a new, brighter FHD screen, which is definitely a welcome improvement. Apart from that, Lenovo carries over many good things from the predecessors, such as the premium metal build, the integrated stylus or the strong quad speaker system.

There are barely any weak points. One of the few is definitely the lack of ports as well as the small amount of coil whine. Also, it is needlessly complicated to open up the Yoga C940 (as screws are hidden beneath rubber feet). It would be nice too if Lenovo would offer a matte screen option and if the LCD panel would hit the promised brightness value of 400 cd/m².

Lenovo does not make any deal-breaking mistakes in this case – which is why the Lenovo Yoga C940-14IIL will probably make it onto many wish-lists this holiday season.

These weak-points are not decisive for us. We can wholeheartedly recommend the Lenovo Yoga C940-14IIL. It is a premium laptop that offers a lot of quality and flexibility, which target groups such as students will appreciate. The Dell XPS 13 7390 2-in-1 has a tough competitor here.

Lenovo Yoga C940-14IIL - 10/12/2019 v7
Benjamin Herzig

Chassis
89 / 98 → 91%
Keyboard
83%
Pointing Device
90%
Connectivity
63 / 75 → 85%
Weight
70 / 20-75 → 91%
Battery
89%
Display
84%
Games Performance
59 / 78 → 76%
Application Performance
88 / 85 → 100%
Temperature
92%
Noise
95%
Audio
74 / 91 → 81%
Camera
48 / 85 → 56%
Average
79%
88%
Convertible - Weighted Average
Read all 19 comments / answer
static version load dynamic
Loading Comments
Comment on this article
Please share our article, every link counts!
> Notebook / Laptop Reviews and News > Reviews > Lenovo Yoga C940-14IIL Laptop Review: Premium Ice Lake convertible is a strong competitor for the Dell XPS 13
Benjamin Herzig, 2019-10-15 (Update: 2019-10-15)
Benjamin Herzig
Editor of the original article: Benjamin Herzig - Editor
In 2010 I started to get more and more involved with technology, especially notebooks have been my passion ever since. Of course I came across the detailed tests of Notebookcheck very quickly. With time I learned more and more about notebooks and started writing small reviews about notebooks in forums and blog pages. To earn some extra money during my studies I turned my hobby into my profession and joined the team of Notebookcheck in 2016. My personal interest is especially in business notebooks.