Notebookcheck

Lenovo IdeaPad Flex 14API Review: Ryzen 5 raises the bar

Sascha Mölck, Andrea Grüblinger (translated by Finn D. Boerne), 10/03/2019

Decent home convertible. Lenovo's IdeaPad Flex 14API features a Ryzen 5 APU, dual-channel RAM, and an NVMe SSD. In addition to finger input, its IPS touchscreen display also supports the optional Lenovo Active Pen 2.

The Lenovo IdeaPad Flex 14API is a slim and compact 14-inch convertible powered by an AMD Ryzen 5 3500U APU. Except for the processor, it is identical to the Flex 14IWL. The latter is powered by an Intel CPU instead. Its main competitors are the Asus VivoBook Flip 14 TP412UA, the HP Pavilion x360 14, and the Acer Spin 3 SP314-51.

Given the similarities between the Flex 14API and the Flex 14IWL we are not going to cover case, connectivity, input devices, and speakers in this review. Should you be interested in these aspects we would like to refer you to our Flex 14 review.

Lenovo Ideapad C340-14API 81N6004UGE (Ideapad C340 Series)
Graphics adapter
AMD Radeon RX Vega 8 - 2048 MB, Core: 1200 MHz, Memory: 1200 MHz, dual-channel, Adrenalin 19.9.2 (26.20.13003.1007)
Memory
8192 MB 
, DDR4-2400, dual-channel, one slot (populateD), 4 GB soldered
Display
14 inch 16:9, 1920 x 1080 pixel 157 PPI, capacitive, 10-point touch, native pen support, BOE CQ NV140FHM-N48, IPS, glossy: yes
Mainboard
AMD CZ FCH
Storage
Samsung SSD PM981 MZVLB256HAHQ, 256 GB 
, 214 GB free
Soundcard
Conexant CX11880 @ AMD K17.1 - Audio Processor - High Definition Audio Controller
Connections
3 USB 3.0 / 3.1 Gen1, 1 HDMI, Audio Connections: combo audio, Card Reader: SD, 1 Fingerprint Reader, Sensors: accelerometer, TPM 2.0
Networking
Qualcomm Atheros QCA9377 Wireless Network Adapter (a/b/g/n = Wi-Fi 4/ac = Wi-Fi 5), Bluetooth 4.2
Size
height x width x depth (in mm): 17.9 x 328 x 229 ( = 0.7 x 12.91 x 9.02 in)
Battery
45 Wh, 2964 mAh Lithium-Ion, 17.6 V
Charging
fast charging / Quickcharge
Operating System
Microsoft Windows 10 Home 64 Bit
Camera
Webcam: HD
Primary Camera: 0.9 MPix
Additional features
Speakers: stereo, Keyboard: chiclet, Keyboard Light: yes, McAfee LiveSafe (trial version), 24 Months Warranty
Weight
1.65 kg ( = 58.2 oz / 3.64 pounds), Power Supply: 361 g ( = 12.73 oz / 0.8 pounds)
Price
699 Euro
Note: The manufacturer may use components from different suppliers including display panels, drives or memory sticks with similar specifications.

 

Working For Notebookcheck

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

Currently wanted: 
News and Editorial Editor - Details here

RatingDateModelWeightHeightSizeResolutionBest Price
81%10/2019Lenovo Ideapad C340-14API 81N6004UGE
3500U, Vega 8
1.7 kg17.9 mm14"1920x1080
83%07/2019Lenovo Flex 14IWL
8265U, UHD Graphics 620
1.7 kg17.8 mm14"1920x1080
83%09/2018Asus VivoBook Flip 14 TP412UA-DB51T
8250U, UHD Graphics 620
1.5 kg17.6 mm14"1920x1080
80%01/2019HP Pavilion x360 14-cd0002ng
8130U, UHD Graphics 620
1.6 kg20 mm14"1920x1080
81%04/2018Acer Spin 3 SP314-51-548L
8250U, UHD Graphics 620
1.7 kg20.8 mm14"1920x1080
84%06/2019Lenovo Yoga 530-14ARR-81H9000VGE
2700U, Vega 10
1.7 kg17.6 mm14"1920x1080

Size Comparison

334.95 mm / 13.2 inch 229.95 mm / 9.05 inch 20.8 mm / 0.819 inch 1.7 kg3.75 lbs328 mm / 12.9 inch 229 mm / 9.02 inch 17.9 mm / 0.705 inch 1.7 kg3.64 lbs328 mm / 12.9 inch 229 mm / 9.02 inch 17.8 mm / 0.701 inch 1.7 kg3.65 lbs327.4 mm / 12.9 inch 224.8 mm / 8.85 inch 17.6 mm / 0.693 inch 1.5 kg3.31 lbs327 mm / 12.9 inch 224.75 mm / 8.85 inch 17.6 mm / 0.693 inch 1.5 kg3.31 lbs324 mm / 12.8 inch 224 mm / 8.82 inch 20 mm / 0.787 inch 1.6 kg3.61 lbs
SDCardreader Transfer Speed
average JPG Copy Test (av. of 3 runs)
Lenovo Flex 14IWL
  (Toshiba Exceria Pro SDXC 64 GB UHS-II)
80.38 MB/s ∼100% +1%
Lenovo Ideapad C340-14API 81N6004UGE
  (Toshiba Exceria Pro SDXC 64 GB UHS-II)
79.6 MB/s ∼99%
HP Pavilion x360 14-cd0002ng
  (Toshiba Exceria Pro SDXC 64 GB UHS-II)
68.2 MB/s ∼85% -14%
Average of class Convertible
  (7.5 - 197, n=130)
61.8 MB/s ∼77% -22%
Asus VivoBook Flip 14 TP412UA-DB51T
  (Toshiba Exceria Pro SDXC 64 GB UHS-II)
25.3 MB/s ∼31% -68%
Asus VivoBook Flip 14 TP412UA-EC969T
  (Toshiba Exceria Pro SDXC 64 GB UHS-II)
23.5 MB/s ∼29% -70%
Acer Spin 3 SP314-51-548L
  (Toshiba Exceria Pro SDXC 64 GB UHS-II)
20.6 MB/s ∼26% -74%
maximum AS SSD Seq Read Test (1GB)
Lenovo Ideapad C340-14API 81N6004UGE
  (Toshiba Exceria Pro SDXC 64 GB UHS-II)
89.8 MB/s ∼100%
Lenovo Flex 14IWL
  (Toshiba Exceria Pro SDXC 64 GB UHS-II)
84.73 MB/s ∼94% -6%
HP Pavilion x360 14-cd0002ng
  (Toshiba Exceria Pro SDXC 64 GB UHS-II)
83.2 MB/s ∼93% -7%
Average of class Convertible
  (19.2 - 246, n=127)
77 MB/s ∼86% -14%
Asus VivoBook Flip 14 TP412UA-EC969T
  (Toshiba Exceria Pro SDXC 64 GB UHS-II)
27.9 MB/s ∼31% -69%
Asus VivoBook Flip 14 TP412UA-DB51T
  (Toshiba Exceria Pro SDXC 64 GB UHS-II)
27.87 MB/s ∼31% -69%
Acer Spin 3 SP314-51-548L
  (Toshiba Exceria Pro SDXC 64 GB UHS-II)
24.8 MB/s ∼28% -72%
Networking
iperf3 Client (receive) TCP 1 m 4M x10
Lenovo Flex 14IWL
Intel Wireless-AC 9560
653 MBit/s ∼100% +96%
Asus VivoBook Flip 14 TP412UA-DB51T
Intel Dual Band Wireless-AC 8265
613 MBit/s ∼94% +84%
Acer Spin 3 SP314-51-548L
Atheros/Qualcomm QCA6174
596 MBit/s ∼91% +79%
Asus VivoBook Flip 14 TP412UA-EC969T
Intel Dual Band Wireless-AC 8265
446 (min: 311, max: 511) MBit/s ∼68% +34%
Lenovo Ideapad C340-14API 81N6004UGE
Qualcomm Atheros QCA9377 Wireless Network Adapter
333 (min: 319, max: 342) MBit/s ∼51%
HP Pavilion x360 14-cd0002ng
RealTek Semiconductor, Device ID: C821
271 (min: 261, max: 290) MBit/s ∼42% -19%
iperf3 Client (transmit) TCP 1 m 4M x10
Lenovo Flex 14IWL
Intel Wireless-AC 9560
674 MBit/s ∼100% +120%
Asus VivoBook Flip 14 TP412UA-EC969T
Intel Dual Band Wireless-AC 8265
566 (min: 407, max: 640) MBit/s ∼84% +85%
Asus VivoBook Flip 14 TP412UA-DB51T
Intel Dual Band Wireless-AC 8265
506 MBit/s ∼75% +65%
HP Pavilion x360 14-cd0002ng
RealTek Semiconductor, Device ID: C821
325 (min: 314, max: 340) MBit/s ∼48% +6%
Lenovo Ideapad C340-14API 81N6004UGE
Qualcomm Atheros QCA9377 Wireless Network Adapter
306 (min: 295, max: 316) MBit/s ∼45%
Acer Spin 3 SP314-51-548L
Atheros/Qualcomm QCA6174
300 MBit/s ∼45% -2%
0102030405060708090100110120130140150160170180190200210220230240250260270280290300310320330340350360370380390400410420430440450460470480490500510520530540550560570580590600610620630640Tooltip
Lenovo Ideapad C340-14API 81N6004UGE AMD Ryzen 5 3500U, AMD Radeon RX Vega 8; iperf3 Client (receive) TCP 1 m 4M x10; iperf 3.1.3: Ø333 (319-342)
Asus VivoBook Flip 14 TP412UA-EC969T Intel Core i3-8130U, Intel UHD Graphics 620; iperf3 Client (receive) TCP 1 m 4M x10; iperf 3.1.3: Ø445 (311-511)
HP Pavilion x360 14-cd0002ng Intel Core i3-8130U, Intel UHD Graphics 620; iperf3 Client (receive) TCP 1 m 4M x10; iperf 3.1.3: Ø271 (261-290)
Lenovo Ideapad C340-14API 81N6004UGE AMD Ryzen 5 3500U, AMD Radeon RX Vega 8; iperf3 Client (transmit) TCP 1 m 4M x10; iperf 3.1.3: Ø306 (295-316)
Asus VivoBook Flip 14 TP412UA-EC969T Intel Core i3-8130U, Intel UHD Graphics 620; iperf3 Client (transmit) TCP 1 m 4M x10; iperf 3.1.3: Ø566 (407-640)
HP Pavilion x360 14-cd0002ng Intel Core i3-8130U, Intel UHD Graphics 620; iperf3 Client (transmit) TCP 1 m 4M x10; iperf 3.1.3: Ø325 (314-340)

Display

Subpixel array
Subpixel array

The Flex 14’s 14-inch touchscreen runs at a native resolution of 1920x1080 pixels. At just 273.1 nits and 713:1, respectively, its maximum brightness and contrast ratio are comparatively poor. We expect a display to have at least 300 nits as well as a contrast ratio of 1,000:1 in order to be considered a good display. That said not a single one of the Flex 14’s competitors in our test group managed to achieve that.

Unfortunately, we found PWM at a very low frequency of just 208 Hz at brightness levels of 90% and below. This low frequency could cause headaches and sore eyes in more sensitive users.

288
cd/m²
287
cd/m²
277
cd/m²
262
cd/m²
285
cd/m²
253
cd/m²
261
cd/m²
291
cd/m²
254
cd/m²
Distribution of brightness
BOE CQ NV140FHM-N48
X-Rite i1Pro 2
Maximum: 291 cd/m² Average: 273.1 cd/m² Minimum: 0.9 cd/m²
Brightness Distribution: 87 %
Center on Battery: 285 cd/m²
Contrast: 713:1 (Black: 0.4 cd/m²)
ΔE Color 5.62 | 0.6-29.43 Ø6
ΔE Greyscale 3.97 | 0.64-98 Ø6.2
58% sRGB (Argyll 3D) 38% AdobeRGB 1998 (Argyll 3D)
Gamma: 2.28
Lenovo Ideapad C340-14API 81N6004UGE
IPS, 1920x1080, 14
Lenovo Flex 14IWL
IPS, 1920x1080, 14
Asus VivoBook Flip 14 TP412UA-EC969T
IPS, 1920x1080, 14
Asus VivoBook Flip 14 TP412UA-DB51T
IPS, 1920x1080, 14
HP Pavilion x360 14-cd0002ng
IPS, 1920x1080, 14
Acer Spin 3 SP314-51-548L
IPS, 1920x1080, 14
Response Times
32%
10%
8%
359%
124%
Response Time Grey 50% / Grey 80% *
43 (23, 20)
30.4 (22, 18.4)
29%
40 (18, 22)
7%
38 (19.6, 18.4)
12%
44 (24, 20)
-2%
43 (21, 22)
-0%
Response Time Black / White *
32 (18, 14)
32.8 (21.2, 11.6)
-3%
28 (16, 12)
12%
30.8 (17.2, 13.6)
4%
30 (17, 13)
6%
35 (21, 14)
-9%
PWM Frequency
208 (90)
352.1 (99)
69%
2439 (30)
1073%
1000
381%
Screen
-2%
18%
9%
12%
22%
Brightness middle
285
284.2
0%
251
-12%
255.5
-10%
225
-21%
220
-23%
Brightness
273
271
-1%
242
-11%
242
-11%
195
-29%
221
-19%
Brightness Distribution
87
89
2%
87
0%
87
0%
72
-17%
78
-10%
Black Level *
0.4
0.49
-23%
0.25
37%
0.29
27%
0.14
65%
0.18
55%
Contrast
713
580
-19%
1004
41%
881
24%
1607
125%
1222
71%
Colorchecker DeltaE2000 *
5.62
4.59
18%
4.03
28%
4.18
26%
5.44
3%
3.98
29%
Colorchecker DeltaE2000 max. *
17.22
18.03
-5%
7.33
57%
19.15
-11%
20.38
-18%
7.69
55%
Greyscale DeltaE2000 *
3.97
3.9
2%
2.55
36%
2.2
45%
3.98
-0%
1.68
58%
Gamma
2.28 96%
2.123 104%
2.48 89%
2.05 107%
2.32 95%
2.37 93%
CCT
6848 95%
6679 97%
6831 95%
6599 98%
6163 105%
6382 102%
Color Space (Percent of AdobeRGB 1998)
38
38
0%
38
0%
37.5
-1%
39
3%
38
0%
Color Space (Percent of sRGB)
58
59
2%
59
2%
59.1
2%
62
7%
58
0%
Colorchecker DeltaE2000 calibrated *
4.57
4.46
3.8
4
Total Average (Program / Settings)
15% / 5%
14% / 16%
9% / 9%
186% / 92%
73% / 45%

* ... 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
32 ms ... rise ↗ and fall ↘ combined↗ 18 ms rise
↘ 14 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. » 82 % of all devices are better.
This means that the measured response time is worse than the average of all tested devices (24.9 ms).
       Response Time 50% Grey to 80% Grey
43 ms ... rise ↗ and fall ↘ combined↗ 23 ms rise
↘ 20 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. » 61 % of all devices are better.
This means that the measured response time is similar to the average of all tested devices (39.7 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 208 Hz ≤ 90 % brightness setting

The display backlight flickers at 208 Hz (Likely utilizing PWM) Flickering detected at a brightness setting of 90 % and below. There should be no flickering or PWM above this brightness setting.

The frequency of 208 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 9370 (minimum: 43 - maximum: 142900) Hz was measured.

Color accuracy was decent out of the box. Nevertheless, at 5.62 the display’s Delta E deviation for colors was higher than the ideal value of less than 3. At least we found no blue tint. At no more than 38% and 58%, respectively, neither the AdobeRGB nor the sRGB color space are fully covered.

We were able to improve color accuracy slightly through calibration, and as always, the resulting ICC profile can be found for download in the box above. Keep in mind to check whether your display matches ours (manufacturer and model number). Otherwise you might end up decreasing instead of increasing color accuracy. Many OEMs source their displays from various manufacturers even within a single series.

CalMAN - ColorChecker
CalMAN - ColorChecker
CalMAN - grayscale
CalMAN - grayscale
CalMAN - saturation
CalMAN - saturation

The Flex 14 is equipped with an IPS panel with wide viewing angles. Accordingly, it can be read from all sides regardless of angle. Outdoors, the display was barely usable at all due to the fatal combination of its reflective coating, its poor maximum brightness, and its low contrast ratio.

IdeaPad outdoors (photo taken in bright sunlight)
IdeaPad outdoors (photo taken in bright sunlight)

Performance

Lenovo’s IdeaPad Flex 14API is a 14-inch convertible with more than enough oomph for all office and internet applications and workloads. Our review unit sold for around 650 Euros (~$714). Various SKUs are available, and prices start at around $450.

Processor

The Flex 14 is equipped with a Ryzen 5 3500U (Picasso) APU. At its core sits a quad-core CPU running at 2.1 GHz, with a turbo boost of up to 3.7 GHz, and support for simultaneous multi-threading (SMT) with two threads per core.

In our Cinebench R15 multithread test the cores ran at up to 3.3 GHz for a short time but eventually dropped to 3 GHz for the remainder of the test. In the single-thread test the single CPU core ran at between 1.5 and 3.7 GHz. On battery, the CPU started out at 2.4 GHz in the multithread test but quickly increased its clock speed to 3.1-3.2 GHz. In the single-thread test it ran at between 1.4 and 2.4 GHz.

CPU-Z
CPU-Z
HWiNFO
HWiNFO

We run the Cinebench R15 multithread test in a 30-minute loop in order to determine whether or not turbo boost is applied liberally during long periods of high sustained load. The scores drop between the first and the seventh iteration but remain constant afterwards. Turbo boost is applied, albeit not at its full potential.

0102030405060708090100110120130140150160170180190200210220230240250260270280290300310320330340350360370380390400410420430440450460470480490500510520530540550560570580590600610620630640650660Tooltip
Lenovo Ideapad C340-14API 81N6004UGE AMD Ryzen 5 3500U, AMD Ryzen 5 3500U: Ø623 (617.72-649.71)
Lenovo Flex 14IWL Intel Core i5-8265U, Intel Core i5-8265U: Ø481 (468.32-534.77)
Asus VivoBook Flip 14 TP412UA-EC969T Intel Core i3-8130U, Intel Core i3-8130U: Ø330 (327.55-342.22)
Asus VivoBook Flip 14 TP412UA-DB51T Intel Core i5-8250U, Intel Core i5-8250U: Ø549 (543.42-590.28)
HP Pavilion x360 14-cd0002ng Intel Core i3-8130U, Intel Core i3-8130U: Ø318 (296.31-322.82)
Acer Spin 3 SP314-51-548L Intel Core i5-8250U, Intel Core i5-8250U: Ø476 (440.88-522.5)
Lenovo Yoga 530-14ARR-81H9000VGE AMD Ryzen 7 2700U, AMD Ryzen 7 2700U: Ø573 (548.16-653.78)
CPU clock speeds during the Cinebench R15 loop
CPU clock speeds during the Cinebench R15 loop
Cinebench R10 Rendering Single 32Bit
4542
Cinebench R10 Rendering Multiple CPUs 32Bit
17481
Cinebench R10 Shading 32Bit
7657
Cinebench R15 CPU Single 64Bit
141 Points
Cinebench R15 CPU Multi 64Bit
650 Points
Cinebench R15 OpenGL 64Bit
47.78 fps
Cinebench R15 Ref. Match 64Bit
98 %
Help
Cinebench R15
CPU Single 64Bit
Lenovo Flex 14IWL
Intel Core i5-8265U
159 Points ∼73% +13%
Acer Spin 3 SP314-51-548L
Intel Core i5-8250U
144 Points ∼66% +2%
Asus VivoBook Flip 14 TP412UA-DB51T
Intel Core i5-8250U
144 Points ∼66% +2%
Lenovo Ideapad C340-14API 81N6004UGE
AMD Ryzen 5 3500U
141 Points ∼65%
Average AMD Ryzen 5 3500U
  (137 - 143, n=6)
141 Points ∼65% 0%
HP Pavilion x360 14-cd0002ng
Intel Core i3-8130U
139 Points ∼64% -1%
Asus VivoBook Flip 14 TP412UA-EC969T
Intel Core i3-8130U
138 Points ∼63% -2%
Average of class Convertible
  (19 - 179, n=302)
105 Points ∼48% -26%
CPU Multi 64Bit
Average AMD Ryzen 5 3500U
  (642 - 665, n=6)
654 Points ∼15% +1%
Lenovo Ideapad C340-14API 81N6004UGE
AMD Ryzen 5 3500U
650 Points ∼15%
Acer Spin 3 SP314-51-548L
Intel Core i5-8250U
523 Points ∼12% -20%
Asus VivoBook Flip 14 TP412UA-DB51T
Intel Core i5-8250U
521 Points ∼12% -20%
Lenovo Flex 14IWL
Intel Core i5-8265U
493 Points ∼11% -24%
Asus VivoBook Flip 14 TP412UA-EC969T
Intel Core i3-8130U
342 Points ∼8% -47%
HP Pavilion x360 14-cd0002ng
Intel Core i3-8130U
320 Points ∼7% -51%
Average of class Convertible
  (33 - 830, n=310)
300 Points ∼7% -54%
Cinebench R10
Rendering Single 32Bit
Acer Spin 3 SP314-51-548L
Intel Core i5-8250U
5540 Points ∼51% +22%
Asus VivoBook Flip 14 TP412UA-EC969T
Intel Core i3-8130U
5419 Points ∼50% +19%
Average AMD Ryzen 5 3500U
  (4542 - 4565, n=2)
4554 Points ∼42% 0%
Lenovo Ideapad C340-14API 81N6004UGE
AMD Ryzen 5 3500U
4542 Points ∼42%
Average of class Convertible
  (466 - 7508, n=243)
3389 Points ∼31% -25%
Rendering Multiple CPUs 32Bit
Average AMD Ryzen 5 3500U
  (17481 - 17578, n=2)
17530 Points ∼27% 0%
Lenovo Ideapad C340-14API 81N6004UGE
AMD Ryzen 5 3500U
17481 Points ∼27%
Acer Spin 3 SP314-51-548L
Intel Core i5-8250U
16067 Points ∼25% -8%
Asus VivoBook Flip 14 TP412UA-EC969T
Intel Core i3-8130U
12172 Points ∼19% -30%
Average of class Convertible
  (706 - 26481, n=239)
7884 Points ∼12% -55%
Cinebench R20
CPU (Single Core)
Lenovo Ideapad C340-14API 81N6004UGE
AMD Ryzen 5 3500U
364 Points ∼71%
Average AMD Ryzen 5 3500U
  (349 - 370, n=4)
361 Points ∼70% -1%
Asus VivoBook Flip 14 TP412UA-EC969T
Intel Core i3-8130U
348 Points ∼68% -4%
Average of class Convertible
  (78 - 465, n=16)
321 Points ∼62% -12%
CPU (Multi Core)
Average AMD Ryzen 5 3500U
  (1451 - 1493, n=4)
1474 Points ∼21% +2%
Lenovo Ideapad C340-14API 81N6004UGE
AMD Ryzen 5 3500U
1451 Points ∼21%
Average of class Convertible
  (200 - 2024, n=16)
983 Points ∼14% -32%
Asus VivoBook Flip 14 TP412UA-EC969T
Intel Core i3-8130U
774 Points ∼11% -47%
Geekbench 3
32 Bit Multi-Core Score
Lenovo Ideapad C340-14API 81N6004UGE
AMD Ryzen 5 3500U
13145 Points ∼16%
Average AMD Ryzen 5 3500U
  (12999 - 13145, n=2)
13072 Points ∼16% -1%
Acer Spin 3 SP314-51-548L
Intel Core i5-8250U
12350 Points ∼15% -6%
Asus VivoBook Flip 14 TP412UA-EC969T
Intel Core i3-8130U
7402 Points ∼9% -44%
Average of class Convertible
  (954 - 14144, n=98)
5297 Points ∼7% -60%
32 Bit Single-Core Score
Lenovo Ideapad C340-14API 81N6004UGE
AMD Ryzen 5 3500U
3477 Points ∼71%
Asus VivoBook Flip 14 TP412UA-EC969T
Intel Core i3-8130U
3469 Points ∼71% 0%
Acer Spin 3 SP314-51-548L
Intel Core i5-8250U
3421 Points ∼70% -2%
Average AMD Ryzen 5 3500U
  (3258 - 3477, n=2)
3368 Points ∼69% -3%
Average of class Convertible
  (561 - 4102, n=98)
2165 Points ∼44% -38%
Geekbench 4.4
64 Bit Multi-Core Score
Acer Spin 3 SP314-51-548L
Intel Core i5-8250U
12516 Points ∼22% +6%
Lenovo Ideapad C340-14API 81N6004UGE
AMD Ryzen 5 3500U
11837 Points ∼21%
Average AMD Ryzen 5 3500U
  (10099 - 11837, n=4)
10891 Points ∼19% -8%
Average of class Convertible
  (2296 - 18527, n=47)
9915 Points ∼17% -16%
Asus VivoBook Flip 14 TP412UA-EC969T
Intel Core i3-8130U
8311 Points ∼14% -30%
64 Bit Single-Core Score
Acer Spin 3 SP314-51-548L
Intel Core i5-8250U
4312 Points ∼68% +10%
Asus VivoBook Flip 14 TP412UA-EC969T
Intel Core i3-8130U
4082 Points ∼64% +5%
Lenovo Ideapad C340-14API 81N6004UGE
AMD Ryzen 5 3500U
3906 Points ∼62%
Average of class Convertible
  (880 - 5523, n=47)
3676 Points ∼58% -6%
Average AMD Ryzen 5 3500U
  (3400 - 3906, n=4)
3645 Points ∼58% -7%
Geekbench 5
64 Bit Multi-Core Score
Average of class Convertible
  (3076 - 4736, n=2)
3906 Points ∼23% +27%
Lenovo Ideapad C340-14API 81N6004UGE
AMD Ryzen 5 3500U
3076 Points ∼18%
Average AMD Ryzen 5 3500U
 
3076 Points ∼18% 0%
64 Bit Single-Core Score
Average of class Convertible
  (888 - 1328, n=2)
1108 Points ∼82% +25%
Lenovo Ideapad C340-14API 81N6004UGE
AMD Ryzen 5 3500U
888 Points ∼66%
Average AMD Ryzen 5 3500U
 
888 Points ∼66% 0%
Mozilla Kraken 1.1 - Total Score
Average of class Convertible
  (809 - 9177, n=195)
2438 ms * ∼4% -86%
HP Pavilion x360 14-cd0002ng
Intel Core i3-8130U (42.17134.10 EDGE HTML 17.17134)
1937.2 ms * ∼3% -48%
Asus VivoBook Flip 14 TP412UA-EC969T
Intel Core i3-8130U (Edge 44)
1428.9 ms * ∼2% -9%
Average AMD Ryzen 5 3500U
  (1237 - 1693, n=5)
1395 ms * ∼2% -7%
Lenovo Ideapad C340-14API 81N6004UGE
AMD Ryzen 5 3500U (Edge 44)
1309.6 ms * ∼2%
Acer Spin 3 SP314-51-548L
Intel Core i5-8250U (Edge 41)
1243.8 ms * ∼2% +5%
Octane V2 - Total Score
Acer Spin 3 SP314-51-548L
Intel Core i5-8250U (Edge 41)
29884 Points ∼57% +2%
Lenovo Ideapad C340-14API 81N6004UGE
AMD Ryzen 5 3500U (Edge 44)
29236 Points ∼56%
Asus VivoBook Flip 14 TP412UA-EC969T
Intel Core i3-8130U (Edge 44)
26467 Points ∼51% -9%
Average AMD Ryzen 5 3500U
  (19083 - 29237, n=5)
25335 Points ∼48% -13%
HP Pavilion x360 14-cd0002ng
Intel Core i3-8130U (42.17134.10 EDGE HTML 17.17134)
25180 Points ∼48% -14%
Average of class Convertible
  (3067 - 42822, n=186)
22009 Points ∼42% -25%
JetStream 1.1 - Total Score
Acer Spin 3 SP314-51-548L
Intel Core i5-8250U (Edge 41)
220.64 Points ∼63% +6%
Asus VivoBook Flip 14 TP412UA-DB51T
Intel Core i5-8250U (Edge 42.17134.1.0)
217.42 Points ∼62% +5%
Lenovo Ideapad C340-14API 81N6004UGE
AMD Ryzen 5 3500U (Edge 44)
207.3 Points ∼59%
HP Pavilion x360 14-cd0002ng
Intel Core i3-8130U (42.17134.10 EDGE HTML 17.17134)
199.04 Points ∼57% -4%
Average of class Convertible
  (33.5 - 288, n=168)
169 Points ∼48% -18%
Average AMD Ryzen 5 3500U
  (107 - 207, n=5)
168 Points ∼48% -19%

* ... smaller is better

System Performance

The system felt very fast and snappy thanks to its combination of Ryzen APU, NVMe SSD, and dual-channel RAM. We did not encounter any issues during our review period. The notebook is more than fast enough for office and internet applications, and it scored very well in our PCMark benchmarks.

Dual-channel RAM
Dual-channel RAM
PCMark 8 Home Score Accelerated v2
3538 points
PCMark 8 Creative Score Accelerated v2
3549 points
PCMark 8 Work Score Accelerated v2
4613 points
Help
PCMark 10
Digital Content Creation
Lenovo Ideapad C340-14API 81N6004UGE
Vega 8, 3500U, Samsung SSD PM981 MZVLB256HAHQ
3466 Points ∼29%
Average AMD Ryzen 5 3500U, AMD Radeon RX Vega 8
  (2989 - 3466, n=5)
3270 Points ∼27% -6%
Lenovo Flex 14IWL
UHD Graphics 620, 8265U, Samsung SSD PM981 MZVLB256HAHQ
2892 Points ∼24% -17%
Asus VivoBook Flip 14 TP412UA-DB51T
UHD Graphics 620, 8250U, Micron 1100 MTFDDAV256TBN
2779 Points ∼23% -20%
Acer Spin 3 SP314-51-548L
UHD Graphics 620, 8250U, Micron 1100 MTFDDAV256TBN
2706 Points ∼23% -22%
Average of class Convertible
  (605 - 4342, n=100)
2492 Points ∼21% -28%
Asus VivoBook Flip 14 TP412UA-EC969T
UHD Graphics 620, 8130U, SanDisk SD9SN8W256G1002
2351 Points ∼20% -32%
HP Pavilion x360 14-cd0002ng
UHD Graphics 620, 8130U, Toshiba KBG30ZMV256G
2232 Points ∼19% -36%
Productivity
Lenovo Flex 14IWL
UHD Graphics 620, 8265U, Samsung SSD PM981 MZVLB256HAHQ
6390 Points ∼66% +8%
Acer Spin 3 SP314-51-548L
UHD Graphics 620, 8250U, Micron 1100 MTFDDAV256TBN
6270 Points ∼65% +6%
Lenovo Ideapad C340-14API 81N6004UGE
Vega 8, 3500U, Samsung SSD PM981 MZVLB256HAHQ
5914 Points ∼61%
Asus VivoBook Flip 14 TP412UA-DB51T
UHD Graphics 620, 8250U, Micron 1100 MTFDDAV256TBN
5722 Points ∼59% -3%
Average AMD Ryzen 5 3500U, AMD Radeon RX Vega 8
  (5456 - 5921, n=5)
5722 Points ∼59% -3%
Asus VivoBook Flip 14 TP412UA-EC969T
UHD Graphics 620, 8130U, SanDisk SD9SN8W256G1002
5649 Points ∼58% -4%
HP Pavilion x360 14-cd0002ng
UHD Graphics 620, 8130U, Toshiba KBG30ZMV256G
5525 Points ∼57% -7%
Average of class Convertible
  (1121 - 7179, n=102)
5266 Points ∼54% -11%
Essentials
Lenovo Flex 14IWL
UHD Graphics 620, 8265U, Samsung SSD PM981 MZVLB256HAHQ
8689 Points ∼79% +5%
Lenovo Ideapad C340-14API 81N6004UGE
Vega 8, 3500U, Samsung SSD PM981 MZVLB256HAHQ
8300 Points ∼75%
Asus VivoBook Flip 14 TP412UA-DB51T
UHD Graphics 620, 8250U, Micron 1100 MTFDDAV256TBN
7731 Points ∼70% -7%
Acer Spin 3 SP314-51-548L
UHD Graphics 620, 8250U, Micron 1100 MTFDDAV256TBN
7548 Points ∼69% -9%
Average AMD Ryzen 5 3500U, AMD Radeon RX Vega 8
  (7008 - 8300, n=5)
7495 Points ∼68% -10%
Asus VivoBook Flip 14 TP412UA-EC969T
UHD Graphics 620, 8130U, SanDisk SD9SN8W256G1002
6982 Points ∼63% -16%
Average of class Convertible
  (2489 - 9678, n=102)
6963 Points ∼63% -16%
HP Pavilion x360 14-cd0002ng
UHD Graphics 620, 8130U, Toshiba KBG30ZMV256G
6902 Points ∼63% -17%
Score
Lenovo Ideapad C340-14API 81N6004UGE
Vega 8, 3500U, Samsung SSD PM981 MZVLB256HAHQ
3972 Points ∼51%
Lenovo Flex 14IWL
UHD Graphics 620, 8265U, Samsung SSD PM981 MZVLB256HAHQ
3896 Points ∼50% -2%
Average AMD Ryzen 5 3500U, AMD Radeon RX Vega 8
  (3485 - 3972, n=5)
3723 Points ∼48% -6%
Acer Spin 3 SP314-51-548L
UHD Graphics 620, 8250U, Micron 1100 MTFDDAV256TBN
3613 Points ∼47% -9%
Asus VivoBook Flip 14 TP412UA-DB51T
UHD Graphics 620, 8250U, Micron 1100 MTFDDAV256TBN
3564 Points ∼46% -10%
Asus VivoBook Flip 14 TP412UA-EC969T
UHD Graphics 620, 8130U, SanDisk SD9SN8W256G1002
3245 Points ∼42% -18%
Average of class Convertible
  (872 - 4677, n=103)
3180 Points ∼41% -20%
HP Pavilion x360 14-cd0002ng
UHD Graphics 620, 8130U, Toshiba KBG30ZMV256G
3153 Points ∼41% -21%
PCMark 8 - Home Score Accelerated v2
Acer Spin 3 SP314-51-548L
UHD Graphics 620, 8250U, Micron 1100 MTFDDAV256TBN
3650 Points ∼60% +3%
Lenovo Ideapad C340-14API 81N6004UGE
Vega 8, 3500U, Samsung SSD PM981 MZVLB256HAHQ
3538 Points ∼58%
Asus VivoBook Flip 14 TP412UA-EC969T
UHD Graphics 620, 8130U, SanDisk SD9SN8W256G1002
3483 Points ∼57% -2%
Average AMD Ryzen 5 3500U, AMD Radeon RX Vega 8
  (3316 - 3538, n=4)
3450 Points ∼57% -2%
Lenovo Flex 14IWL
UHD Graphics 620, 8265U, Samsung SSD PM981 MZVLB256HAHQ
3438 Points ∼56% -3%
HP Pavilion x360 14-cd0002ng
UHD Graphics 620, 8130U, Toshiba KBG30ZMV256G
3198 Points ∼52% -10%
Asus VivoBook Flip 14 TP412UA-DB51T
UHD Graphics 620, 8250U, Micron 1100 MTFDDAV256TBN
2986 Points ∼49% -16%
Average of class Convertible
  (741 - 4741, n=278)
2801 Points ∼46% -21%

Storage Devices

Our review unit was equipped with a fast 256 GB M.2-2280 NVMe SSD made by Samsung. Around 214 GB was user accessible after first boot; the rest is used up by the recovery partition and the Windows operating system. The SSD was very fast overall. Since they are connected to the much faster PCI Express bus NVMe SSDs tend to be much faster than SATA III SSDs, which are limited to just 600 MB/s.

SSD storage device
SSD storage device
Samsung SSD PM981 MZVLB256HAHQ
Sequential Read: 2250 MB/s
Sequential Write: 1448 MB/s
512K Read: 867.4 MB/s
512K Write: 1320 MB/s
4K Read: 54.43 MB/s
4K Write: 107.4 MB/s
4K QD32 Read: 306.5 MB/s
4K QD32 Write: 235.1 MB/s
Lenovo Ideapad C340-14API 81N6004UGE
Samsung SSD PM981 MZVLB256HAHQ
Lenovo Flex 14IWL
Samsung SSD PM981 MZVLB256HAHQ
Asus VivoBook Flip 14 TP412UA-EC969T
SanDisk SD9SN8W256G1002
Asus VivoBook Flip 14 TP412UA-DB51T
Micron 1100 MTFDDAV256TBN
Acer Spin 3 SP314-51-548L
Micron 1100 MTFDDAV256TBN
Average Samsung SSD PM981 MZVLB256HAHQ
 
Average of class Convertible
 
CrystalDiskMark 5.2 / 6
15%
-57%
-56%
-50%
0%
-30%
Write 4K
132.9
136.5
3%
44.92
-66%
66.49
-50%
90.72
-32%
110 (50.2 - 137, n=21)
-17%
95.4 (1.168 - 194, n=96)
-28%
Read 4K
42.75
45.74
7%
25.32
-41%
24.65
-42%
27.58
-35%
41 (31.4 - 63.7, n=21)
-4%
34.7 (0.536 - 114, n=95)
-19%
Write Seq
1447
466.2
-68%
413.2
-71%
396.1
-73%
1390 (991 - 1687, n=20)
-4%
772 (27.9 - 2372, n=92)
-47%
Read Seq
2134
415.6
-81%
465.2
-78%
486.8
-77%
1570 (755 - 2134, n=20)
-26%
1089 (74.7 - 2677, n=91)
-49%
Write 4K Q32T1
252
380.5
51%
237.4
-6%
227
-10%
253.4
1%
356 (205 - 568, n=21)
41%
273 (1.212 - 747, n=96)
8%
Read 4K Q32T1
334.2
437.5
31%
172.2
-48%
188.4
-44%
246.4
-26%
389 (229 - 645, n=21)
16%
282 (1.189 - 570, n=96)
-16%
Write Seq Q32T1
1447
1502.2
4%
532
-63%
439.9
-70%
436
-70%
1500 (1380 - 1712, n=21)
4%
923 (18.4 - 2985, n=96)
-36%
Read Seq Q32T1
3522
3357.1
-5%
563.3
-84%
533.3
-85%
524.1
-85%
3293 (1529 - 3522, n=21)
-7%
1748 (68.9 - 3522, n=96)
-50%

GPU Performance

The other half of the Ryzen 5 APU is a Radeon RX Vega 8 GPU with support for DirectX 12 and clock speeds of up to 1,200 MHz. 3DMark results were at a level expected of this particular GPU, which benefits immensely from dual-channel RAM configurations. 

3DMark 11 Performance
3950 points
3DMark Ice Storm Standard Score
62308 points
3DMark Cloud Gate Standard Score
13484 points
3DMark Fire Strike Score
2287 points
3DMark Time Spy Score
714 points
Help
3DMark 11 - 1280x720 Performance GPU
Lenovo Yoga 530-14ARR-81H9000VGE
AMD Radeon RX Vega 10, AMD Ryzen 7 2700U
4045 Points ∼100% +4%
Lenovo Ideapad C340-14API 81N6004UGE
AMD Radeon RX Vega 8, AMD Ryzen 5 3500U
3883 Points ∼96%
Average AMD Radeon RX Vega 8
  (1668 - 4317, n=26)
3311 Points ∼82% -15%
Asus VivoBook Flip 14 TP412UA-DB51T
Intel UHD Graphics 620, Intel Core i5-8250U
1737 Points ∼43% -55%
Lenovo Flex 14IWL
Intel UHD Graphics 620, Intel Core i5-8265U
1682 Points ∼42% -57%
Acer Spin 3 SP314-51-548L
Intel UHD Graphics 620, Intel Core i5-8250U
1634 Points ∼40% -58%
Asus VivoBook Flip 14 TP412UA-EC969T
Intel UHD Graphics 620, Intel Core i3-8130U
1561 Points ∼39% -60%
HP Pavilion x360 14-cd0002ng
Intel UHD Graphics 620, Intel Core i3-8130U
1451 Points ∼36% -63%
Average of class Convertible
  (173 - 7483, n=327)
1275 Points ∼32% -67%
3DMark
2560x1440 Time Spy Graphics
Lenovo Yoga 530-14ARR-81H9000VGE
AMD Radeon RX Vega 10, AMD Ryzen 7 2700U
679 Points ∼100% +7%
Average AMD Radeon RX Vega 8
  (523 - 742, n=11)
641 Points ∼94% +1%
Lenovo Ideapad C340-14API 81N6004UGE
AMD Radeon RX Vega 8, AMD Ryzen 5 3500U
632 Points ∼93%
Average of class Convertible
  (85 - 1682, n=32)
485 Points ∼71% -23%
1920x1080 Fire Strike Graphics
Lenovo Ideapad C340-14API 81N6004UGE
AMD Radeon RX Vega 8, AMD Ryzen 5 3500U
2506 Points ∼100%
Lenovo Yoga 530-14ARR-81H9000VGE
AMD Radeon RX Vega 10, AMD Ryzen 7 2700U
2376 Points ∼95% -5%
Average AMD Radeon RX Vega 8
  (1095 - 2901, n=23)
2098 Points ∼84% -16%
Acer Spin 3 SP314-51-548L
Intel UHD Graphics 620, Intel Core i5-8250U
1117 Points ∼45% -55%
Asus VivoBook Flip 14 TP412UA-EC969T
Intel UHD Graphics 620, Intel Core i3-8130U
1103 Points ∼44% -56%
Lenovo Flex 14IWL
Intel UHD Graphics 620, Intel Core i5-8265U
1074 Points ∼43% -57%
Average of class Convertible
  (132 - 5965, n=238)
1016 Points ∼41% -59%
1280x720 Cloud Gate Standard Graphics
Lenovo Ideapad C340-14API 81N6004UGE
AMD Radeon RX Vega 8, AMD Ryzen 5 3500U
18087 Points ∼100%
Lenovo Yoga 530-14ARR-81H9000VGE
AMD Radeon RX Vega 10, AMD Ryzen 7 2700U
17440 Points ∼96% -4%
Average AMD Radeon RX Vega 8
  (7309 - 19351, n=22)
14344 Points ∼79% -21%
Asus VivoBook Flip 14 TP412UA-EC969T
Intel UHD Graphics 620, Intel Core i3-8130U
9312 Points ∼51% -49%
Acer Spin 3 SP314-51-548L
Intel UHD Graphics 620, Intel Core i5-8250U
9128 Points ∼50% -50%
Lenovo Flex 14IWL
Intel UHD Graphics 620, Intel Core i5-8265U
8216 Points ∼45% -55%
HP Pavilion x360 14-cd0002ng
Intel UHD Graphics 620, Intel Core i3-8130U
7357 Points ∼41% -59%
Average of class Convertible
  (1023 - 37388, n=289)
6753 Points ∼37% -63%

Gaming Performance

The APU is powerful enough to run many of the games from our database smoothly, especially those that are a bit older or not as demanding as the latest and greatest AAA titles, such as for example Dota 2 Reborn, Diablo 3, Sims 4, Starcraft 2, Team Fortress 2, or League of Legends. Many games will run smoothly at HD resolution (1366x768) in medium details, and some will even allow higher settings and resolutions.

low med. high ultra
BioShock Infinite (2013) 116.271.460.221fps
Control (2019) 269.16.4fps
Borderlands 3 (2019) 34.914.297.1fps
FIFA 20 (2019) 103.758.549.841.1fps
BioShock Infinite - 1366x768 High Preset
Lenovo Ideapad C340-14API 81N6004UGE
AMD Ryzen 5 3500U, AMD Radeon RX Vega 8
60.2 fps ∼100%
Lenovo Yoga 530-14ARR-81H9000VGE
AMD Ryzen 7 2700U, AMD Radeon RX Vega 10
54.8 fps ∼91% -9%
Average AMD Radeon RX Vega 8
  (17.2 - 60.2, n=11)
47.9 fps ∼80% -20%
Asus VivoBook Flip 14 TP412UA-DB51T
Intel Core i5-8250U, Intel UHD Graphics 620
29.1 fps ∼48% -52%
Asus VivoBook Flip 14 TP412UA-EC969T
Intel Core i3-8130U, Intel UHD Graphics 620
28.2 fps ∼47% -53%
Acer Spin 3 SP314-51-548L
Intel Core i5-8250U, Intel UHD Graphics 620
26.8 fps ∼45% -55%
Average of class Convertible
  (2.1 - 149, n=194)
25.9 fps ∼43% -57%
HP Pavilion x360 14-cd0002ng
Intel Core i3-8130U, Intel UHD Graphics 620
20.41 fps ∼34% -66%
Lenovo Flex 14IWL
Intel Core i5-8265U, Intel UHD Graphics 620
19 fps ∼32% -68%

Emissions and Energy Management

System Noise

Overall, the IdeaPad remained comparatively quiet. Both fans are off when idle, and the laptop is completely silent as a result. Even once they start spinning, the fans are barely noticeable. However, they spin up quite quickly under load, and we measured a sound pressure level of 37.2 dB(A) during our stress test.

Noise Level

Idle
30.2 / 31 / 31 dB(A)
Load
37.3 / 37.2 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: 30.2 dB(A)
dB(A) 0102030405060708090Deep BassMiddle BassHigh BassLower RangeMidsHigher MidsLower HighsMid HighsUpper HighsSuper Highs2034.138.335.333.734.1253645.635.432.6363147.549.536.834.747.5403740.532.933.2375032.535.335.533.432.56327.830.827.427.927.88027.628.826.426.227.610026.125.725.527.326.112525.624.726.32725.616023.624.924.623.623.620023.124.224.223.323.125021.724.124.122.721.731521.224.924.721.321.240020.32424.520.220.350020.524.124.819.320.563019.32322.918.319.380018.824.524.61818.8100019.929.129.117.719.9125018.625.82617.218.6160018.425.225.517.218.4200018.727.627.417.218.7250018.426.826.317.518.4315018.825.92617.418.84000182524.917.81850001822.822.617.918630018.121.321.217.918.1800018.419.719.51818.41000018.118.918.61818.1125001818.318.117.8181600017.91817.917.717.9SPL3137.337.230.231N1.52.72.61.41.5median 18.8median 24.5median 24.6median 18median 18.8Delta1.61.21.52.31.6hearing rangehide median Fan NoiseLenovo Ideapad C340-14API 81N6004UGE

Temperature

IdeaPad during our stress test
IdeaPad during our stress test

Early on during the test the CPU ran at up to 2.3-2.4 GHz, which was quickly reduced to just 1.7 GHz. The GPU ran at 300 to 400 MHz. Oddly enough, at a constant 2.3-2.4 GHz for the CPU and 600 to 800 MHz for the GPU, clock speeds were actually higher on battery than they were on mains. Keep in mind that our stress test is an extreme load scenario that rarely ever occurs during everyday use. We use this test in order to determine whether or not a notebook is stable at maximum load.

The Flex 14 stayed fairly cool overall. The maximum temperature determined during our stress test was slightly over 40 °C at the bottom of the device. It remained much cooler during normal use.

Max. Load
 29.8 °C
86 F
38 °C
100 F
30.4 °C
87 F
 
 30.9 °C
88 F
34.7 °C
94 F
27.3 °C
81 F
 
 25 °C
77 F
25.1 °C
77 F
23.4 °C
74 F
 
Maximum: 38 °C = 100 F
Average: 29.4 °C = 85 F
36 °C
97 F
40.4 °C
105 F
29.8 °C
86 F
25.1 °C
77 F
35.4 °C
96 F
26.8 °C
80 F
23.2 °C
74 F
23.8 °C
75 F
24.1 °C
75 F
Maximum: 40.4 °C = 105 F
Average: 29.4 °C = 85 F
Power Supply (max.)  40.3 °C = 105 F | Room Temperature 22.1 °C = 72 F | FIRT 550-Pocket
(+) The average temperature for the upper side under maximal load is 29.4 °C / 85 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 38 °C / 100 F, compared to the average of 35.4 °C / 96 F, ranging from 21.8 to 55.7 °C for the class Convertible.
(±) The bottom heats up to a maximum of 40.4 °C / 105 F, compared to the average of 36.5 °C / 98 F
(+) In idle usage, the average temperature for the upper side is 26.4 °C / 80 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 25.7 °C / 78.3 F and are therefore cool to the touch.
(+) The average temperature of the palmrest area of similar devices was 28.9 °C / 84 F (+3.2 °C / 5.7 F).
Heat map top (load)
Heat map top (load)
Heat map bottom (load)
Heat map bottom (load)

Speaker

dB(A) 0102030405060708090Deep BassMiddle BassHigh BassLower RangeMidsHigher MidsLower HighsMid HighsUpper HighsSuper Highs2034.633.734.62534.632.634.63140.934.740.94034.233.234.25032.333.432.36332.827.932.88033.626.233.61004227.34212546.42746.416048.123.648.120042.823.342.825053.322.753.331559.521.359.540066.220.266.250064.619.364.663063.418.363.480068.31868.3100066.817.766.8125064.517.264.5160065.817.265.820006617.26625005817.558315058.417.458.4400058.817.858.8500057.617.957.6630061.917.961.9800061.51861.51000053.11853.11250055.217.855.21600048.917.748.9SPL75.430.275.4N37.11.437.1median 58.8median 18median 58.8Delta6.52.36.538.340.732.435.833.133.933.332.931.13130.533.630.231.128.732.127.4392749.126.55426.359.826.163.725.565.524.665.224.366.224.173.324.274.623.870.123.567.823.272.223.266.623.36623.26823.271.923.275.123.176.323.17722.972.822.974.835.7842.560.5median 23.8median 67.80.97.2hearing rangehide median Pink NoiseLenovo Ideapad C340-14API 81N6004UGEAsus VivoBook Flip 14 TP412UA-DB51T
Frequency diagram (checkboxes can be checked and unchecked to compare devices)
Lenovo Ideapad C340-14API 81N6004UGE audio analysis

(-) | not very loud speakers (68.32 dB)
Bass 100 - 315 Hz
(±) | reduced bass - on average 10.4% lower than median
(±) | linearity of bass is average (14.9% delta to prev. frequency)
Mids 400 - 2000 Hz
(±) | higher mids - on average 6.9% higher than median
(+) | mids are linear (6% delta to prev. frequency)
Highs 2 - 16 kHz
(+) | balanced highs - only 2% away from median
(±) | linearity of highs is average (8% delta to prev. frequency)
Overall 100 - 16.000 Hz
(±) | linearity of overall sound is average (15.4% difference to median)
Compared to same class
» 13% of all tested devices in this class were better, 6% similar, 81% worse
» The best had a delta of 11%, average was 22%, worst was 53%
Compared to all devices tested
» 17% of all tested devices were better, 4% similar, 79% worse
» The best had a delta of 3%, average was 21%, worst was 53%

Asus VivoBook Flip 14 TP412UA-DB51T audio analysis

(±) | speaker loudness is average but good (77.01 dB)
Bass 100 - 315 Hz
(-) | nearly no bass - on average 18.2% lower than median
(±) | linearity of bass is average (12.3% delta to prev. frequency)
Mids 400 - 2000 Hz
(+) | balanced mids - only 3.2% away from median
(+) | mids are linear (6.4% delta to prev. frequency)
Highs 2 - 16 kHz
(+) | balanced highs - only 4.6% away from median
(+) | highs are linear (5.6% delta to prev. frequency)
Overall 100 - 16.000 Hz
(±) | linearity of overall sound is average (17.7% difference to median)
Compared to same class
» 29% of all tested devices in this class were better, 7% similar, 65% worse
» The best had a delta of 11%, average was 22%, worst was 53%
Compared to all devices tested
» 28% of all tested devices were better, 7% similar, 65% worse
» The best had a delta of 3%, average was 21%, worst was 53%

Power Consumption

We did not notice any power consumption abnormalities during our tests. Maximum power consumption when idle was measured at 9.7 W and peaked at 49 W when running our stress test (Prime95 and FurMark simultaneously for at least one hour) but decreased shortly thereafter. The power supply is rated at 65 W.

Power Consumption
Off / Standbydarklight 0.4 / 0.5 Watt
Idledarkmidlight 5.1 / 7.2 / 9.7 Watt
Load midlight 40 / 49 Watt
 color bar
Key: min: dark, med: mid, max: light        Metrahit Energy

Battery Life

Our real-life Wi-Fi test simulates a load scenario typical for browsing the web. The power profile is set to Balanced, all power-saving features are disabled, and the display brightness is set to 150 nits. With these settings, the IdeaPad Flex 14 lasted for 7:28 hours.

Battery Runtime
NBC WiFi Websurfing Battery Test 1.3 (Edge 44)
7h 28min
Battery Runtime - WiFi Websurfing 1.3
Lenovo Flex 14IWL
8265U, UHD Graphics 620, 45 Wh
623 min ∼24% +39%
Asus VivoBook Flip 14 TP412UA-DB51T
8250U, UHD Graphics 620, 42 Wh
578 min ∼22% +29%
Acer Spin 3 SP314-51-548L
8250U, UHD Graphics 620, 52.5 Wh
496 min ∼19% +11%
Average of class Convertible
  (153 - 1010, n=253)
455 min ∼17% +2%
Lenovo Ideapad C340-14API 81N6004UGE
3500U, Vega 8, 45 Wh
448 min ∼17%
HP Pavilion x360 14-cd0002ng
8130U, UHD Graphics 620, 41 Wh
446 min ∼17% 0%
Asus VivoBook Flip 14 TP412UA-EC969T
8130U, UHD Graphics 620, 42 Wh
412 min ∼16% -8%

Pros

+ IPS display
+ decent system performance
+ NVMe SSD
+ backlit keyboard
+ stylus support

Cons

- dim low-contrast display
- poor color-space coverage
- mediocre Wi-Fi performance
- no DisplayPort via USB-C
- no USB-C power delivery

Verdict

Lenovo IdeaPad Flex 14API. Review unit courtesy of Cyberport.
Lenovo IdeaPad Flex 14API. Review unit courtesy of Cyberport.

Lenovo’s IdeaPad Flex 14API is equipped with a powerful Ryzen 5 3500U APU. In Cinebench R15 the CPU was significantly faster than the Core i5-8265U quad-core CPU that the otherwise identical Lenovo Flex 14IWL is equipped with. The integrated GPU was much faster than Intel's counterpart as well, and it even allowed for some limited gaming.

Lenovo’s IdeaPad Flex 14API is a well-rounded convertible for home users. Unfortunately, it has a few drawbacks.

The system felt very fast thanks to the NVMe SSD, which can be replaced and upgraded after removing the bottom panel. The keyboard was usable and equipped with a backlight. Battery life was decent, albeit noticeably shorter than on the Flex 14’s Intel-equipped sibling.

The IPS touchscreen offered great viewing angles and a somewhat decent color accuracy. However, it lacked in brightness, contrast ratio, and color-space coverage. In addition to finger input, the touchscreen also supports the optional Lenovo Active Pen 2 stylus, which can be purchased for around $50.

Lenovo Ideapad C340-14API 81N6004UGE - 10/07/2019 v7
Sascha Mölck

Chassis
79 / 98 → 81%
Keyboard
71%
Pointing Device
92%
Connectivity
47 / 75 → 62%
Weight
67 / 20-75 → 86%
Battery
77%
Display
77%
Games Performance
57 / 78 → 73%
Application Performance
80 / 85 → 94%
Temperature
94%
Noise
93%
Audio
58 / 91 → 64%
Camera
34 / 85 → 40%
Average
71%
81%
Convertible - Weighted Average

Pricecompare

static version load dynamic
Loading Comments
Comment on this article
Please share our article, every link counts!
> Notebook / Laptop Reviews and News > Reviews > Lenovo IdeaPad Flex 14API Review: Ryzen 5 raises the bar
Sascha Mölck, 2019-10- 3 (Update: 2019-10- 5)