Notebookcheck

联想 Flex 11 Chromebook简短评测

Steve Schardein (translated by Yuchen Wang), 07/01/2017
Chromebook ARM Touchscreen Convertible / 2-in-1

朴实无华… 帮助Chromebook获得至今最大成功的是教育市场,相比其他市场领域它在这个方面得到了明显更高的占有率。考虑到这个机遇,联想也希望凭借一台为学生设计的简洁实用且廉价的笔记本电脑取得成功。

Lenovo Flex 11 Chromebook
Processor
Mediatek MT8173C 2.1 GHz
Graphics adapter
PowerVR GX6250
Memory
4096 MB 
, LPDDR3
Display
11.6 inch 16:9, 1366x768 pixel 135 PPI, 10点触控, IPS, glossy: yes
Storage
32 GB eMMC Flash, 32 GB 
Connections
2 USB 3.0 / 3.1 Gen1, 1 HDMI, 1 Kensington Lock, Audio Connections: 3.5毫米整合音频接口, Card Reader: SD/MMC
Networking
Wireless LAN 802.11 a/g/n/ac (a/g/n/ac), Bluetooth 4.2
Size
height x width x depth (in mm): 21 x 299 x 208
Battery
45 Wh Lithium-Polymer, 3芯, 内置
Operating System
Google Chrome OS
Camera
Webcam: 720p 高清摄像头,定焦
Primary Camera: 1 MPix
Additional features
Speakers: 2.0, Keyboard: 孤岛式, Keyboard Light: no, 12 Months Warranty, fanless, ruggedized
Weight
1.35 kg, Power Supply: 266 g

 

Front: no connections
Front: no connections
Rear: No connections
Rear: No connections
Left: USB Type-C (charging) port, HDMI, USB 3.0 Type-A (conventional) port, SD card reader
Left: USB Type-C (charging) port, HDMI, USB 3.0 Type-A (conventional) port, SD card reader
Right: Combo audio jack, volume rocker, power button, Kensington Lock port
Right: Combo audio jack, volume rocker, power button, Kensington Lock port
SDCardreader Transfer Speed - average JPG Copy Test (av. of 3 runs)
Lenovo ThinkPad 13 Chromebook
50.9 MB/s ∼100% +536%
Lenovo IdeaPad MIIX 310-10ICR
41.21 MB/s ∼81% +415%
Lenovo Flex 11 Chromebook
8 MB/s ∼16%
254.9
cd/m²
243.8
cd/m²
234.6
cd/m²
263.9
cd/m²
275.1
cd/m²
244.2
cd/m²
261.7
cd/m²
273.7
cd/m²
241.1
cd/m²
Distribution of brightness
X-Rite i1Pro Basic 2
Maximum: 275.1 cd/m² Average: 254.8 cd/m²
Brightness Distribution: 85 %
Center on Battery: 275.1 cd/m²
Contrast: 887:1 (Black: 0.31 cd/m²)
ΔE Color 5.2 | - Ø
ΔE Greyscale 2.8 | - Ø
Gamma: 2.28
Lenovo Flex 11 Chromebook
IPS, 11.6, 1366x768
Asus Transformer Book T100HA-C4-GR
AUO20D4, IPS, 10.1, 1280x800
Lenovo ThinkPad 13 Chromebook
IPS, 13.3, 1920x1080
Acer Chromebook R13 CB5-312T-K0YK
IPS, 13.3, 1920x1080
Lenovo IdeaPad MIIX 310-10ICR
IPS, 10.1, 1280x800
Response Times
-21%
3%
-28%
Response Time Grey 50% / Grey 80% *
33.6 (18.8, 14.8)
37.6 (15.2, 22.4)
-12%
38 (14, 24)
-13%
31.6 (13.6, 18)
6%
Response Time Black / White *
28 (16.4, 11.6)
36 (5.2, 30.8)
-29%
23 (5, 18)
18%
24.8 (6, 28.8)
11%
PWM Frequency
20830 (99)
69.4
-100%
Screen
30%
-26%
-8%
-36%
Brightness
255
455
78%
261
2%
204
-20%
233
-9%
Brightness Distribution
85
85
0%
92
8%
88
4%
83
-2%
Black Level *
0.31
0.324
-5%
0.601
-94%
0.23
26%
0.348
-12%
Contrast
887
1482
67%
437
-51%
835
-6%
724
-18%
Colorchecker DeltaE2000 *
5.2
3.45
34%
4.87
6%
6.35
-22%
Greyscale DeltaE2000 *
2.8
2.67
5%
3.51
-25%
3.99
-43%
7.09
-153%
Gamma
2.28 105%
2.34 103%
2.17 111%
2.45 98%
2.02 119%
CCT
6861 95%
6164 105%
6476 100%
6380 102%
8590 76%
Color Space (Percent of AdobeRGB 1998)
47.28
52.69
Color Space (Percent of sRGB)
84.38
Total Average (Program / Settings)
30% / 30%
-24% / -24%
-3% / -5%
-32% / -33%

* ... 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
28 ms ... rise ↗ and fall ↘ combined↗ 16.4 ms rise
↘ 11.6 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. » 58 % of all devices are better.
This means that the measured response time is similar to the average of all tested devices (26.8 ms).
       Response Time 50% Grey to 80% Grey
33.6 ms ... rise ↗ and fall ↘ combined↗ 18.8 ms rise
↘ 14.8 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. » 21 % of all devices are better.
This means that the measured response time is better than the average of all tested devices (43 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 20830 Hz99 % brightness setting

The display backlight flickers at 20830 Hz (Likely utilizing PWM) Flickering detected at a brightness setting of 99 % and below. There should be no flickering or PWM above this brightness setting.

The frequency of 20830 Hz is quite high, so most users sensitive to PWM should not notice any flickering.

In comparison: 58 % of all tested devices do not use PWM to dim the display. If PWM was detected, an average of 5885 (minimum: 43 - maximum: 142900) Hz was measured.

Sunspider - 1.0 Total Score (sort by value)
Lenovo Flex 11 Chromebook
PowerVR GX6250, MT8173C, 32 GB eMMC Flash
589.5 ms * ∼15%
Asus Transformer Book T100HA-C4-GR
HD Graphics (Cherry Trail), Z8500, Samsung CGND3R eMMC
399.8 ms * ∼10% +32%
Lenovo ThinkPad 13 Chromebook
HD Graphics 520, 6300U, 32 GB eMMC Flash
213 ms * ∼5% +64%
Acer Chromebook R13 CB5-312T-K0YK
PowerVR GX6250, MT8173C, 32 GB eMMC Flash
577.7 ms * ∼14% +2%
JetStream 1.1 - 1.1 Total Score (sort by value)
Lenovo Flex 11 Chromebook
PowerVR GX6250, MT8173C, 32 GB eMMC Flash
57.116 Points ∼17%
Lenovo ThinkPad 13 Chromebook
HD Graphics 520, 6300U, 32 GB eMMC Flash
173.25 Points ∼52% +203%
Acer Chromebook R13 CB5-312T-K0YK
PowerVR GX6250, MT8173C, 32 GB eMMC Flash
56.99 Points ∼17% 0%
Mozilla Kraken 1.1 - Total Score (sort by value)
Lenovo Flex 11 Chromebook
PowerVR GX6250, MT8173C, 32 GB eMMC Flash
2975.9 ms * ∼5%
Asus Transformer Book T100HA-C4-GR
HD Graphics (Cherry Trail), Z8500, Samsung CGND3R eMMC
5142.2 ms * ∼9% -73%
Lenovo ThinkPad 13 Chromebook
HD Graphics 520, 6300U, 32 GB eMMC Flash
1007 ms * ∼2% +66%
Acer Chromebook R13 CB5-312T-K0YK
PowerVR GX6250, MT8173C, 32 GB eMMC Flash
3297.2 ms * ∼6% -11%
Lenovo IdeaPad MIIX 310-10ICR
HD Graphics (Cherry Trail), Z8350, 64 GB eMMC Flash
6122 ms * ∼10% -106%
Octane V2 - Total Score (sort by value)
Lenovo Flex 11 Chromebook
PowerVR GX6250, MT8173C, 32 GB eMMC Flash
10319 Points ∼21%
Lenovo ThinkPad 13 Chromebook
HD Graphics 520, 6300U, 32 GB eMMC Flash
29435 Points ∼59% +185%
Acer Chromebook R13 CB5-312T-K0YK
PowerVR GX6250, MT8173C, 32 GB eMMC Flash
10139 Points ∼20% -2%
Lenovo IdeaPad MIIX 310-10ICR
HD Graphics (Cherry Trail), Z8350, 64 GB eMMC Flash
6343 Points ∼13% -39%
WebXPRT 2015 - Overall Score (sort by value)
Lenovo Flex 11 Chromebook
PowerVR GX6250, MT8173C, 32 GB eMMC Flash
142 Points ∼19%
Lenovo ThinkPad 13 Chromebook
HD Graphics 520, 6300U, 32 GB eMMC Flash
359 Points ∼48% +153%
Acer Chromebook R13 CB5-312T-K0YK
PowerVR GX6250, MT8173C, 32 GB eMMC Flash
138 Points ∼18% -3%

* ... smaller is better

Max. Load
 33 °C32 °C29.8 °C 
 32.2 °C31.6 °C29.4 °C 
 27.2 °C28 °C28.4 °C 
Maximum: 33 °C
Average: 30.2 °C
30 °C33.8 °C36 °C
29.6 °C33.6 °C33.4 °C
27.6 °C28.4 °C27.8 °C
Maximum: 36 °C
Average: 31.1 °C
Power Supply (max.)  30 °C | Room Temperature 20 °C | Fluke 62 Mini IR Thermometer
dB(A) 0102030405060708090Deep BassMiddle BassHigh BassLower RangeMidsHigher MidsLower HighsMid HighsUpper HighsSuper Highs2035.539.535.52536.135.236.13133.434.233.44035.631.635.65032.63232.66331.834.331.88031.532.231.510030.431.530.412529.728.429.716029.526.929.52003227.23225043.326.443.331557.525.757.540066.12566.150068.824.668.863067.823.767.880071.423.871.4100073.223.173.2125075.82375.8160071.322.771.3200066.122.666.1250068.522.268.5315071.122.171.1400065.82265.8500069.622.269.6630074.32274.3800071.62271.61000062.422.162.41250063.222.163.21600065.922.265.9SPL833583N56.72.456.7median 66.1Lenovo Flex 11 Chromebookmedian 23median 66.1Delta10.11.810.142.735.842.73933.33939.532.639.540.631.340.641.829.941.844.131.144.144.328.244.34528.34545.625.345.647.525.647.551.224.951.254.323.554.359.522.959.560.421.860.463.120.963.16619.96672.719.372.771.318.971.363.218.263.261.918.261.963.117.863.165.317.665.366.417.666.467.317.667.370.517.670.563.817.863.865.917.865.964.717.764.764.617.564.665.117.765.179.130.879.146.11.546.1median 63.8Acer Chromebook R13 CB5-312T-K0YKmedian 18.2median 63.83.92.33.9hearing rangehide median Pink Noise
Lenovo Flex 11 Chromebook audio analysis

(+) | speakers can play relatively loud (83.01 dB)
Bass 100 - 315 Hz
(-) | nearly no bass - on average 29.1% lower than median
(±) | linearity of bass is average (11.6% delta to prev. frequency)
Mids 400 - 2000 Hz
(+) | balanced mids - only 3.9% away from median
(±) | linearity of mids is average (8.7% delta to prev. frequency)
Highs 2 - 16 kHz
(+) | balanced highs - only 4.1% away from median
(±) | linearity of highs is average (10.2% delta to prev. frequency)
Overall 100 - 16.000 Hz
(±) | linearity of overall sound is average (24% difference to median)
Compared to same class
» 80% of all tested devices in this class were better, 5% similar, 16% worse
» The best had a delta of 9%, average was 19%, worst was 41%
Compared to all devices tested
» 62% of all tested devices were better, 8% similar, 30% worse
» The best had a delta of 3%, average was 22%, worst was 53%

Acer Chromebook R13 CB5-312T-K0YK audio analysis

(±) | speaker loudness is average but good (73 dB)
Bass 100 - 315 Hz
(±) | reduced bass - on average 13.2% lower than median
(+) | bass is linear (5.6% delta to prev. frequency)
Mids 400 - 2000 Hz
(+) | balanced mids - only 3.2% away from median
(+) | mids are linear (6.9% delta to prev. frequency)
Highs 2 - 16 kHz
(+) | balanced highs - only 2.5% away from median
(+) | highs are linear (5.5% delta to prev. frequency)
Overall 100 - 16.000 Hz
(+) | overall sound is linear (11.9% difference to median)
Compared to same class
» 0% of all tested devices in this class were better, 33% similar, 67% worse
» The best had a delta of 12%, average was 17%, worst was 25%
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 22%, worst was 53%

Power Consumption
Off / Standbydarklight 0.3 / 1.3 Watt
Idledarkmidlight 1.5 / 5.4 / 5.5 Watt
Load midlight 6.3 / 7.9 Watt
 color bar
Key: min: dark, med: mid, max: light        Metrahit Energy
Lenovo Flex 11 Chromebook
MT8173C, PowerVR GX6250, 32 GB eMMC Flash, IPS, 1366x768, 11.6
Lenovo ThinkPad 13 Chromebook
6300U, HD Graphics 520, 32 GB eMMC Flash, IPS, 1920x1080, 13.3
Acer Chromebook R13 CB5-312T-K0YK
MT8173C, PowerVR GX6250, 32 GB eMMC Flash, IPS, 1920x1080, 13.3
Lenovo IdeaPad MIIX 310-10ICR
Z8350, HD Graphics (Cherry Trail), 64 GB eMMC Flash, IPS, 1280x800, 10.1
Power Consumption
-11%
-65%
-102%
Idle Minimum *
1.5
0.77
49%
3.8
-153%
5.14
-243%
Idle Average *
5.4
5.11
5%
6.2
-15%
7.6
-41%
Idle Maximum *
5.5
5.88
-7%
6.6
-20%
8.28
-51%
Load Average *
6.3
7.43
-18%
11
-75%
11.33
-80%
Load Maximum *
7.9
14.73
-86%
12.7
-61%
15.36
-94%

* ... smaller is better

Battery Runtime
WiFi Surfing v1.3
12h 44min
Lenovo Flex 11 Chromebook
MT8173C, PowerVR GX6250, 45 Wh
Asus Transformer Book T100HA-C4-GR
Z8500, HD Graphics (Cherry Trail), 30 Wh
Lenovo ThinkPad 13 Chromebook
6300U, HD Graphics 520, 42 Wh
Acer Chromebook R13 CB5-312T-K0YK
MT8173C, PowerVR GX6250, 53.9 Wh
Lenovo IdeaPad MIIX 310-10ICR
Z8350, HD Graphics (Cherry Trail), 33 Wh
Battery Runtime
-29%
-30%
1%
-16%
Reader / Idle
1460
1249
WiFi v1.3
764
541
-29%
536
-30%
773
1%
643
-16%
Load
246
170

Pros

+ 非常廉价
+ 尽管采用塑料机身,但相对坚固
+ 防溅水设计
+ 长电池续航
+ IPS触控屏幕
+ 安静

Cons

- 键盘键程短反馈弱
- 集成触控版按键使用感受差
- 作为11.6寸机型相对笨重
- 接口配备较少
- 外观不吸引人
- Chrome操作系统相比其他操作系统受限制较多
In review: Lenovo Flex 11 Chromebook. Test model provided by Lenovo US
In review: Lenovo Flex 11 Chromebook. Test model provided by Lenovo US

联想这次挽起了袖子,希望凭Flex 11 Chromebook在教育市场中一争高下。在它279美元的价钱背后的是所有用户可能期待的常见功能。它采用了低成本(同时绝不优雅)的ABS/碳素塑料机身,它提供了不错的坚固度,搭配橡胶边角也可以对坠落等意外情况提供一定的保护。它搭配了一块防溅水键盘和触控板,利用独立水流通道为内部组件提供保护。由于采用简洁的Chrome OS,它在运行中响应迅速,同时big.LITTLE芯片组和大容量电池的搭配带来了很长的续航时间。在这些之上,它的屏幕品质也十分不错(除了较低的分辨率),同时支持触控。

Flex 11 Chromebook在对教育市场的冲击中使出了一套强力组合拳:简洁可靠的性能表现,坚固的机身,长电池续航,和亲易近人的定价。不过,它的输入设备和连接性缺让人略感遗憾;外观设计也不是它的优势所在。

当然,由于价位不足300美元,它也有不少妥协之处。首先——我们知道你可能已经听厌了,不过我们不得不指出来——Chrome OS依然不能算是一个像是Windows一样得到广泛支持的全功能操作系统。对于安卓应用的支持会带来不小改善,不过依然离完整个人电脑体验很远。除此之外,它的输入设备最多只能算是一般。它的键盘键程短、反馈弱,而触控版的搭配按键可以说是我们用过最差的之一。作为一台11.6寸机型,它的重量和尺寸也都较大,不过可能大部分青少年可以接受这个限制。最后,它只提供了最基本的接口,仅两个USB接口(其中一个是C型接口,同时作为充电接口)和一个用于视频输出的HDMI接口。

不过,从整体上来看,Flex 11是一台十分值得推荐给需要此类设备且可以接受它的弱点的用户的设备。它没有特别的亮点,但是提供了完整的表现和较高的性价比。

注:本文是基于完整评测的缩减版本,阅读完整的英文评测,请点击这里。 

Lenovo Flex 11 Chromebook - 06/26/2017 v6
Steve Schardein

Chassis
61 /  98 → 62%
Keyboard
64%
Pointing Device
80%
Connectivity
39 / 80 → 49%
Weight
71 / 78 → 84%
Battery
96%
Display
80%
Games Performance
0 / 68 → 
Application Performance
59 / 87 → 68%
Temperature
95 / 91 → 100%
Noise
100%
Audio
60 / 91 → 66%
Camera
60 / 85 → 71%
Average
72%
80%
Subnotebook - Weighted Average

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> Notebookcheck中文版(NBC中国) > 评测 > 联想 Flex 11 Chromebook简短评测
Steve Schardein, 2017-07- 1 (Update: 2017-07- 1)