Notebookcheck

Trekstor Primebook C11 (N3350, HD500) Convertible Review

Mike Wobker, Felicitas Krohn (translated by Stanislav Kokhanyuk), 03/28/2018

Can it be smaller? Trekstor takes the design and hardware of the Primebook C13 and crams it all into an 11-inch case. What we get as a result is the Primeboon C11, which we examine in this review to see whether the same hardware components can offer similar performance in a smaller form-factor.

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Not long ago we reviewed the Primebook C13 from Trekstor. The device offered enough performance to be able to run most simple applications. Now the Primebook C11 hits the market. It comes with identical hardware, but in a smaller form-factor. Just like the bigger brother, it features a slot for an M.2 SSD, which is hidden behind a maintenance hatch, and is powered by an Intel Celeron N3350 with Intel’s integrated HD Graphics 500.

The 11-inch device is somewhat easier to handle than the 13-inch model, which is most noticeable in tablet mode. The glossy Full HD IPS display has a native resolution of 1920x1080 and offers great color space coverage. The touchscreen also works well. This is why there is no need to connect any conventional input devices to the convertible. The keyboard could have been more sturdy, but it fulfills its purpose, anyway.

When making comparisons with other cheap notebooks, we focus, above all, on the price and the size of the competing devices. This is why we compare the Primebook C11 with other 11-inch convertibles that cost less 500 Euros. The competing devices include: The Acer Spin 1 SP111-31-C79E, Lenovo’s Ideapad 120s, the VivoBook E12 E203NA-FD026T from Asus and the Medion Akoya E2228T.  We will go into more detail about the benchmark and test results in the “Verdict” section of this short review.

Trekstor Primebook C11 (Primebook Series)
Graphics adapter
Memory
4096 MB 
, DDR3
Display
11.6 inch 16:9, 1920 x 1080 pixel 190 PPI, capacitive , MS_9003, IPS, glossy: yes
Storage
SanDisk DF4064, 64 GB 
, 50 GB free
Soundcard
RealTek ALC269 @ Intel Apollo Lake SoC - High Definition Audio Controller
Connections
3 USB 3.0 / 3.1 Gen1, 1 HDMI, Card Reader: MicroSD, 1 Fingerprint Reader
Networking
Intel Dual Band Wireless-AC 3165 (a/b/g/n/ac), Bluetooth 4.2
Size
height x width x depth (in mm): 15 x 280 x 190 ( = 0.59 x 11.02 x 7.48 in)
Battery
36.48 Wh, 4.8 mAh Lithium-Polymer
Operating System
Microsoft Windows 10 Home 64 Bit
Camera
Webcam: 2 MP, 720p
Additional features
Speakers: Stereo, Keyboard: Chiclet-syle, Keyboard Light: no, 24 Months Warranty, fanless
Weight
1.16 kg ( = 40.92 oz / 2.56 pounds), Power Supply: 125 g ( = 4.41 oz / 0.28 pounds)
Price
279 Euro
Note: The manufacturer may use components from different suppliers including display panels, drives or memory sticks with similar specifications.

 

Size Comparison

Left side: one USB 3.1 Type-C port, Micro-HDMI, one USB 3.1 port
Left side: one USB 3.1 Type-C port, Micro-HDMI, one USB 3.1 port
Right side: power button, Micro SD card reader, one USB 3.1 port, headphone/microphone combo jack, DC power socket
Right side: power button, Micro SD card reader, one USB 3.1 port, headphone/microphone combo jack, DC power socket
SDCardreader Transfer Speed
average JPG Copy Test (av. of 3 runs)
Average of class Subnotebook
  (8 - 186, n=97)
60.6 MB/s ∼100% +171%
Lenovo Ideapad 120s-11IAP
  (Toshiba Exceria Pro M401)
59.88 MB/s ∼99% +167%
Asus VivoBook E12 E203NA-FD026T
  (Toshiba Exceria Pro M501 microSDXC 64GB)
24 MB/s ∼40% +7%
Trekstor Primebook C13
  (Toshiba Exceria Pro M501 microSDXC 64GB)
22.7 MB/s ∼37% +1%
Trekstor Primebook C11
  (Toshiba Exceria Pro M501 microSDXC 64GB)
22.4 MB/s ∼37%
Medion Akoya E2228T-MD61250
  (Toshiba Exceria Pro M501 microSDXC 64GB)
21.8 MB/s ∼36% -3%
maximum AS SSD Seq Read Test (1GB)
Lenovo Ideapad 120s-11IAP
  (Toshiba Exceria Pro M401)
85.86 MB/s ∼100% +319%
Average of class Subnotebook
  (17.7 - 251, n=98)
79.9 MB/s ∼93% +290%
Asus VivoBook E12 E203NA-FD026T
  (Toshiba Exceria Pro M501 microSDXC 64GB)
39.5 MB/s ∼46% +93%
Trekstor Primebook C13
  (Toshiba Exceria Pro M501 microSDXC 64GB)
35.2 MB/s ∼41% +72%
Medion Akoya E2228T-MD61250
  (Toshiba Exceria Pro M501 microSDXC 64GB)
30.2 MB/s ∼35% +47%
Trekstor Primebook C11
  (Toshiba Exceria Pro M501 microSDXC 64GB)
20.5 MB/s ∼24%
Networking
iperf3 Client (receive) TCP 1 m 4M x10
Average of class Subnotebook
  (71 - 950, n=85)
525 MBit/s ∼100% +70%
Lenovo Ideapad 120s-11IAP
Qualcomm Atheros QCA9377 Wireless Network Adapter
348 MBit/s ∼66% +13%
Acer Spin 1 SP111-31-C79E
Qualcomm Atheros QCA9377 Wireless Network Adapter
338 MBit/s ∼64% +9%
Asus VivoBook E12 E203NA-FD026T
Qualcomm Atheros QCA9377 Wireless Network Adapter
318 MBit/s ∼61% +3%
Trekstor Primebook C13
Intel Dual Band Wireless-AC 3165
314 MBit/s ∼60% +2%
Trekstor Primebook C11
Intel Dual Band Wireless-AC 3165
309 MBit/s ∼59%
Medion Akoya E2228T-MD61250
Intel Dual Band Wireless-AC 3165
297 MBit/s ∼57% -4%
iperf3 Client (transmit) TCP 1 m 4M x10
Average of class Subnotebook
  (72 - 949, n=85)
518 MBit/s ∼100% +154%
Trekstor Primebook C13
Intel Dual Band Wireless-AC 3165
345 MBit/s ∼67% +69%
Asus VivoBook E12 E203NA-FD026T
Qualcomm Atheros QCA9377 Wireless Network Adapter
341 MBit/s ∼66% +67%
Lenovo Ideapad 120s-11IAP
Qualcomm Atheros QCA9377 Wireless Network Adapter
330 MBit/s ∼64% +62%
Medion Akoya E2228T-MD61250
Intel Dual Band Wireless-AC 3165
271 MBit/s ∼52% +33%
Acer Spin 1 SP111-31-C79E
Qualcomm Atheros QCA9377 Wireless Network Adapter
214 MBit/s ∼41% +5%
Trekstor Primebook C11
Intel Dual Band Wireless-AC 3165
204 MBit/s ∼39%

Display - a lot of colors flicker on the Primebook C11

240
cd/m²
259
cd/m²
247
cd/m²
268
cd/m²
272
cd/m²
255
cd/m²
237
cd/m²
244
cd/m²
219
cd/m²
Distribution of brightness
X-Rite i1Pro 2
Maximum: 272 cd/m² Average: 249 cd/m² Minimum: 23.5 cd/m²
Brightness Distribution: 81 %
Center on Battery: 284 cd/m²
Contrast: 618:1 (Black: 0.44 cd/m²)
ΔE Color 6.36 | 0.4-29.43 Ø6.2
ΔE Greyscale 7.15 | 0.64-98 Ø6.5
93% sRGB (Argyll 3D) 60% AdobeRGB 1998 (Argyll 3D)
Gamma: 2.47

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Trekstor Primebook C11
MS_9003, IPS, 1920x1080, 11.6
Trekstor Primebook C13
PBTB133F006-A, IPS, 1920x1080, 13.3
Lenovo Ideapad 120s-11IAP
AU Optronics AUO-B116XTN02.5 , TN LED, 1366x768, 11.6
Acer Spin 1 SP111-31-C79E
AU Optronics B116HAN05.0, IPS, 1920x1080, 11.6
Asus VivoBook E12 E203NA-FD026T
AU Optronics B116XTN02.2, TN LED, 1366x768, 11.6
Medion Akoya E2228T-MD61250
Chi Mei N116HSE-EJ1, IPS, 1920x1080, 11.6
Average of class Subnotebook
 
Screen
4%
-47%
18%
-23%
32%
-12%
Brightness middle
272
201
-26%
266.2
-2%
251
-8%
253
-7%
504
85%
262 (111 - 677, n=599)
-4%
Brightness
249
207
-17%
251
1%
247
-1%
234
-6%
497
100%
Brightness Distribution
81
88
9%
90
11%
86
6%
87
7%
86
6%
Black Level *
0.44
0.22
50%
0.67
-52%
0.21
52%
0.33
25%
0.52
-18%
0.794 (0.08 - 3.31, n=625)
-80%
Contrast
618
914
48%
397
-36%
1195
93%
767
24%
969
57%
Colorchecker DeltaE2000 *
6.36
6.6
-4%
12.4
-95%
4.27
33%
10.84
-70%
4.48
30%
5.79 (0.4 - 13.2, n=241)
9%
Colorchecker DeltaE2000 max. *
11.06
12.39
-12%
24.5
-122%
11
1%
17.48
-58%
9.38
15%
10.5 (1.4 - 30.5, n=140)
5%
Greyscale DeltaE2000 *
7.15
7.73
-8%
14.4
-101%
3.77
47%
11.86
-66%
1.63
77%
6.17 (0.8 - 14.5, n=242)
14%
Gamma
2.47 89%
2.46 89%
2.16 102%
2.26 97%
2.72 81%
2.41 91%
2.33 94% (1.33 - 3.83, n=242)
CCT
8664 75%
7864 83%
19436 33%
6524 100%
12882 50%
6715 97%
8493 77% (5531 - 22973, n=242)
Color Space (Percent of AdobeRGB 1998)
60
61
2%
37
-38%
47
-22%
36
-40%
51
-15%
51.2 (34 - 85.1, n=218)
-15%
Color Space (Percent of sRGB)
93
93
0%
59
-37%
72
-23%
57
-39%
77
-17%
80.6 (39 - 100, n=149)
-13%

* ... 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 (25.6 ms).
       Response Time 50% Grey to 80% Grey
41 ms ... rise ↗ and fall ↘ combined↗ 20 ms rise
↘ 21 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. » 49 % of all devices are better.
This means that the measured response time is similar to the average of all tested devices (41 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 200 Hz ≤ 20 % brightness setting

The display backlight flickers at 200 Hz (Likely utilizing PWM) Flickering detected at a brightness setting of 20 % and below. There should be no flickering or PWM above this brightness setting.

The frequency of 200 Hz is relatively low, so sensitive users will likely notice flickering and experience eyestrain at the stated brightness setting and below.

In comparison: 53 % of all tested devices do not use PWM to dim the display. If PWM was detected, an average of 8933 (minimum: 43 - maximum: 142900) Hz was measured.

sRGB - 93 %
sRGB - 93 %
AdobeRGB - 60 %
AdobeRGB - 60 %

Performance - Trekstor does not live up to the expectations

Processor

Cinebench R15
CPU Single 64Bit
Average of class Subnotebook
  (20 - 171, n=233)
111 Points ∼51% +158%
Acer Spin 1 SP111-31-C79E
Intel Celeron N3450
48 Points ∼22% +12%
Asus VivoBook E12 E203NA-FD026T
Intel Celeron N3350
48 Points ∼22% +12%
Lenovo Ideapad 120s-11IAP
Intel Celeron N3350
46 Points ∼21% +7%
Trekstor Primebook C13
Intel Celeron N3350
45 Points ∼21% +5%
Average Intel HD Graphics 500
  (36 - 48, n=13)
44.9 Points ∼21% +4%
Trekstor Primebook C11
Intel Celeron N3350
43 Points ∼20%
Medion Akoya E2228T-MD61250
Intel Atom x5-Z8350
28 Points ∼13% -35%
CPU Multi 64Bit
Average of class Subnotebook
  (32 - 721, n=240)
306 Points ∼7% +278%
Acer Spin 1 SP111-31-C79E
Intel Celeron N3450
135 Points ∼3% +67%
Average Intel HD Graphics 500
  (81 - 167, n=13)
114 Points ∼3% +41%
Medion Akoya E2228T-MD61250
Intel Atom x5-Z8350
97 Points ∼2% +20%
Asus VivoBook E12 E203NA-FD026T
Intel Celeron N3350
92 Points ∼2% +14%
Trekstor Primebook C13
Intel Celeron N3350
88 Points ∼2% +9%
Lenovo Ideapad 120s-11IAP
Intel Celeron N3350
85 Points ∼2% +5%
Trekstor Primebook C11
Intel Celeron N3350
81 Points ∼2%
Cinebench R15 CPU Single 64Bit
43 Points
Cinebench R15 CPU Multi 64Bit
81 Points
Cinebench R15 OpenGL 64Bit
10.74 fps
Cinebench R15 Ref. Match 64Bit
97.8 %
Help

System Performance

PCMark 8 - Home Score Accelerated v2
Average of class Subnotebook
  (1027 - 4182, n=201)
2991 Points ∼100% +91%
Asus VivoBook E12 E203NA-FD026T
HD Graphics 500, N3350, 32 GB eMMC Flash
1816 Points ∼61% +16%
Lenovo Ideapad 120s-11IAP
HD Graphics 500, N3350, 64 GB eMMC Flash
1810 Points ∼61% +16%
Average Intel Celeron N3350, Intel HD Graphics 500
  (1564 - 1816, n=7)
1700 Points ∼57% +9%
Trekstor Primebook C13
HD Graphics 500, N3350, SanDisk DF4064
1629 Points ∼54% +4%
Trekstor Primebook C11
HD Graphics 500, N3350, SanDisk DF4064
1564 Points ∼52%
Acer Spin 1 SP111-31-C79E
HD Graphics 500, N3450, Toshiba MQ01ABF050
1530 Points ∼51% -2%
Medion Akoya E2228T-MD61250
HD Graphics 400 (Braswell), Z8350, 64 GB eMMC Flash
1303 Points ∼44% -17%
PCMark 8 Home Score Accelerated v2
1564 points
Help

Storage Devices

Trekstor Primebook C11
HD Graphics 500, N3350, SanDisk DF4064
Trekstor Primebook C13
HD Graphics 500, N3350, SanDisk DF4064
Acer Spin 1 SP111-31-C79E
HD Graphics 500, N3450, Toshiba MQ01ABF050
Asus VivoBook E12 E203NA-FD026T
HD Graphics 500, N3350, 32 GB eMMC Flash
Medion Akoya E2228T-MD61250
HD Graphics 400 (Braswell), Z8350, 64 GB eMMC Flash
Average SanDisk DF4064
 
CrystalDiskMark 3.0
-4%
-71%
3%
-29%
-2%
Write 4k QD32
14.19
13.83
-3%
1.043
-93%
24.63
74%
14.57
3%
14 (13.8 - 14.2, n=2)
-1%
Read 4k QD32
32.66
32.26
-1%
1.003
-97%
29.66
-9%
14.76
-55%
32.5 (32.3 - 32.7, n=2)
0%
Write 4k
8.721
9.903
14%
1.037
-88%
10.17
17%
11.3
30%
9.31 (8.72 - 9.9, n=2)
7%
Read 4k
9.175
5.212
-43%
0.482
-95%
8.963
-2%
10.74
17%
7.19 (5.21 - 9.18, n=2)
-22%
Write 512
85.28
85.93
1%
45.28
-47%
43.83
-49%
34.28
-60%
85.6 (85.3 - 85.9, n=2)
0%
Read 512
205.4
207.2
1%
35.89
-83%
238.1
16%
101.3
-51%
206 (205 - 207, n=2)
0%
Write Seq
111.2
113.8
2%
107.3
-4%
78.35
-30%
41.38
-63%
113 (111 - 114, n=2)
2%
Read Seq
265.4
265.4
0%
109.1
-59%
276.6
4%
119.3
-55%
265 (265 - 265, n=2)
0%
SanDisk DF4064
Sequential Read: 265.4 MB/s
Sequential Write: 111.2 MB/s
512K Read: 205.4 MB/s
512K Write: 85.28 MB/s
4K Read: 9.175 MB/s
4K Write: 8.721 MB/s
4K QD32 Read: 32.66 MB/s
4K QD32 Write: 14.19 MB/s

Graphics Card

3DMark 11 - 1280x720 Performance GPU
Average of class Subnotebook
  (230 - 4494, n=321)
1167 Points ∼100% +119%
Trekstor Primebook C13
Intel HD Graphics 500, Intel Celeron N3350
543 Points ∼47% +2%
Trekstor Primebook C11
Intel HD Graphics 500, Intel Celeron N3350
534 Points ∼46%
Asus VivoBook E12 E203NA-FD026T
Intel HD Graphics 500, Intel Celeron N3350
497 Points ∼43% -7%
Average Intel HD Graphics 500
  (368 - 584, n=10)
485 Points ∼42% -9%
Lenovo Ideapad 120s-11IAP
Intel HD Graphics 500, Intel Celeron N3350
482 Points ∼41% -10%
Acer Spin 1 SP111-31-C79E
Intel HD Graphics 500, Intel Celeron N3450
368 Points ∼32% -31%
Medion Akoya E2228T-MD61250
Intel HD Graphics 400 (Braswell), Intel Atom x5-Z8350
292 Points ∼25% -45%
3DMark 11 Performance
589 points
Help

Emissions & Energy Management - battery: Primetime with Primebook

Temperature

Max. Load
 32.7 °C
91 F
29.6 °C
85 F
28.3 °C
83 F
 
 33.4 °C
92 F
30.6 °C
87 F
29.1 °C
84 F
 
 30.7 °C
87 F
30.3 °C
87 F
29.6 °C
85 F
 
Maximum: 33.4 °C = 92 F
Average: 30.5 °C = 87 F
29.8 °C
86 F
31 °C
88 F
33.3 °C
92 F
29.9 °C
86 F
31.2 °C
88 F
33.7 °C
93 F
29.7 °C
85 F
30.8 °C
87 F
32.8 °C
91 F
Maximum: 33.7 °C = 93 F
Average: 31.4 °C = 89 F
Power Supply (max.)  42.2 °C = 108 F | Room Temperature 23.6 °C = 74 F | FIRT 550-Pocket
(+) The average temperature for the upper side under maximal load is 30.5 °C / 87 F, compared to the average of 30.7 °C / 87 F for the devices in the class Subnotebook.
(+) The maximum temperature on the upper side is 33.4 °C / 92 F, compared to the average of 35.9 °C / 97 F, ranging from 22 to 57 °C for the class Subnotebook.
(+) The bottom heats up to a maximum of 33.7 °C / 93 F, compared to the average of 40.3 °C / 105 F
(+) In idle usage, the average temperature for the upper side is 26.3 °C / 79 F, compared to the device average of 30.7 °C / 87 F.
(+) The palmrests and touchpad are cooler than skin temperature with a maximum of 30.7 °C / 87.3 F and are therefore cool to the touch.
(±) The average temperature of the palmrest area of similar devices was 28.7 °C / 83.7 F (-2 °C / -3.6 F).
Heat distribution at idle - topside
Heat distribution at idle - topside
Heat distribution at idle - bottom side
Heat distribution at idle - bottom side
Heat distribution under load - topside
Heat distribution under load - topside
Heat distribution under load - bottom side
Heat distribution under load - bottom side

Speakers

dB(A) 0102030405060708090Deep BassMiddle BassHigh BassLower RangeMidsHigher MidsLower HighsMid HighsUpper HighsSuper Highs2032.430.932.4253432.1343133.333.733.34031.429.331.45032.530.632.56329.927.229.98027.127.227.110028.125.128.112529.324.629.316030.32330.320028.622.728.625026.122.426.131536.221.636.240048.520.348.550052.518.852.563059.218.559.280059.817.859.8100067.817.767.8125066.617.766.6160066.317.766.3200064.817.364.8250065.817.765.8315066.317.866.3400067.218.167.2500068.218.268.2630071.418.571.4800073.718.573.71000066.918.666.91250059.418.559.41600052.518.752.5SPL79.530.479.5N42.91.442.9median 59.8median 18.5median 59.8Delta11.92.211.935.335.132.931.831.83236.535.132.428.93328.936.328.848.32761.52752.924.860.92462.822.763.32269.521.267.82174.82075.919.472.718.97117.770.117.86917.671.817.668.117.671.417.673.717.670.417.571.617.671.617.669.617.459.717.583.630.662.51.5median 69.6median 17.84.62.4hearing rangehide median Pink NoiseTrekstor Primebook C11Apple MacBook 12 (Early 2016) 1.1 GHz
Trekstor Primebook C11 audio analysis

(±) | speaker loudness is average but good (73.67 dB)
Bass 100 - 315 Hz
(-) | nearly no bass - on average 30% lower than median
(±) | linearity of bass is average (7.2% delta to prev. frequency)
Mids 400 - 2000 Hz
(±) | higher mids - on average 5.7% higher than median
(±) | linearity of mids is average (10.5% delta to prev. frequency)
Highs 2 - 16 kHz
(±) | higher highs - on average 8.7% higher than median
(+) | highs are linear (5.4% delta to prev. frequency)
Overall 100 - 16.000 Hz
(-) | overall sound is not linear (31% difference to median)
Compared to same class
» 88% of all tested devices in this class were better, 4% similar, 8% worse
» The best had a delta of 8%, average was 19%, worst was 50%
Compared to all devices tested
» 90% of all tested devices were better, 4% similar, 7% worse
» The best had a delta of 3%, average was 21%, worst was 53%

Apple MacBook 12 (Early 2016) 1.1 GHz audio analysis

(+) | speakers can play relatively loud (83.6 dB)
Bass 100 - 315 Hz
(±) | reduced bass - on average 11.3% lower than median
(±) | linearity of bass is average (14.2% delta to prev. frequency)
Mids 400 - 2000 Hz
(+) | balanced mids - only 2.4% away from median
(+) | mids are linear (5.5% delta to prev. frequency)
Highs 2 - 16 kHz
(+) | balanced highs - only 2% away from median
(+) | highs are linear (4.5% delta to prev. frequency)
Overall 100 - 16.000 Hz
(+) | overall sound is linear (9.3% difference to median)
Compared to same class
» 2% of all tested devices in this class were better, 2% similar, 96% worse
» The best had a delta of 8%, average was 19%, worst was 50%
Compared to all devices tested
» 2% of all tested devices were better, 1% similar, 98% worse
» The best had a delta of 3%, average was 21%, worst was 53%

Frequency diagram in comparison (checkboxes can be checked and unchecked!)

Energy Consumption

Power Consumption
Off / Standbydarklight 0.3 / 0.35 Watt
Idledarkmidlight 4 / 7.1 / 7.8 Watt
Load midlight 17.2 / 17.9 Watt
 color bar
Key: min: dark, med: mid, max: light        Metrahit Energy
Battery Runtime
NBC WiFi Websurfing Battery Test 1.3
7h 34min

Pros

+ slim design
+ good color space coverage
+ maintenance hatch for an SSD
+ USB-Type-C port

Cons

- reflective display surface
- not much storage space

Verdict - Trekstor shrinks the C13 down to C11

Our review device was provided to use curtesy of: notebooksbilliger.de
Our review device was provided to use curtesy of: notebooksbilliger.de

In our review, the Primebook C11 always remains close to the bigger brother Primebook C13. However, the performance does not entirely live up to our expectations. Here, the system performance is comparable to other similarly-equipped devices. However, other manufacturers can offer even more performance for 280 Euros. In terms of the ports, the Primebook C11 is limited to the bare minimum, which should not be understood as criticism by any means. Besides a separate DC power socket, our review device also features a USB Type-C port, which can be used to charge the laptop with the 40-watt AC adapter.

The display of the Primebook C11 is really worth a look for photo enthusiasts. Because the screen manages to cover over 90 % of the sRGB color space, the images should be rendered accurately. Our review device offers enough performance for simple image editing. However, it is not going to be able to handle any more demanding applications. Our review device uses PWM for brightness control. Because, it comes with a comparatively low frequency of 300 Hz (20 % brightness), it can cause problems for users with susceptible eyes. 

In terms of battery life, the Primebook C11 beats the bigger model and takes a spot in the middle of our comparison chart. While the Primebook C11 does not feature a user-replaceable battery, it does offer a slot for an M.2 SSD. This slot is located behind a maintenance hatch. It is easy to open and it takes SSDs with a length of 52 mm. 

Buyers of the Primebook C11 get a convertible that cannot realize its full potential, but which still offers a solid system performance. The good display and easily upgradable internal storage constitute a good reason to buy. However, prospective buyers should not forget that the Primebook C11 cannot run demanding applications and that it is only fit for office work and Internet browsing.

Trekstor Primebook C11 - 03/24/2018 v6
Mike Wobker

Chassis
89 /  98 → 91%
Keyboard
67%
Pointing Device
58%
Connectivity
35 / 80 → 44%
Weight
73 / 35-78 → 89%
Battery
90%
Display
79%
Games Performance
50 / 68 → 74%
Application Performance
46 / 87 → 52%
Temperature
94 / 91 → 100%
Noise
100%
Audio
44 / 91 → 48%
Camera
33 / 85 → 39%
Average
66%
78%
Subnotebook - Weighted Average

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> Notebook / Laptop Reviews and News > Reviews > Trekstor Primebook C11 (N3350, HD500) Convertible Review
Mike Wobker, 2018-03-28 (Update: 2018-05-15)