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MagyarTrekstor Yourbook C11B (N3350, eMMC, FHD) Convertible Review
The Trekstor Yourbook C11B is an 11.6-inch convertible that the company has designed primarily for students. Correspondingly, the device comes with subscriptions to learning applications and services like MS Office 365 Personal. The C11B is powered by an Intel Apollo Lake processor that is not particularly powerful and is the sister model to the Trekstor Primebook C11, a device that we have already reviewed.
We have chosen to compare the C11B against the Lenovo Yoga 330-11IGM, the Medion Akoya E2228T, the Dell Chromebook 11 3181 2-in-1 and the ASUS VivoBook Flip 12 TP203NAH.
Case & Connectivity
Our test device is completely black, but Trekstor also sells a pink version should you prefer more distinctive-looking laptops. Trekstor has designed the C11B using a mixture of metal and plastic. The display lid and bottom case are metal, while the rest of the device is made of plastic. Our test device is well-built with no manufacturing flaws or uneven gaps between materials. Moreover, the device is sturdy and withstood our attempts to bend or twist it. The bottom case could be stiffer, but overall the C11B is a robust device for the money. The battery is not replaceable without removing the entire bottom case though.
The C11B has a surprisingly good selection of ports considering its price. There are two USB 3.1 Type-A ports and a USB 3.1 Gen 1 Type-C port, which supports charging, data transfer and video output. The Type-C port is not Thunderbolt 3, but this would be redundant in such an underpowered device. Trekstor has included a micro HDMI port too along with a headphone jack, a charging port and a microSD-card slot. Effectively, the C11B has two video outputs and two charging ports; you cannot charge the device faster with two power supplies though.
Trekstor has equipped the C11B with a USB 2.0 microSD-card slot, which is in line with our comparison devices. Our test device achieved a maximum transfer speed of 25.8 MB/s when copying large blocks of data with our 64 GB Toshiba Exceria Pro M501 microSDXC reference card, which puts it second bottom in our comparison table.
Our test device has an Intel Dual Band Wireless-AC 3165 Wi-Fi card, which supports IEEE 802.11 a/b/g/n/ac Wi-Fi standards, the latter of which we do not always see in devices at this price. The device only has a 1x1 MIMO antenna, which puts it on par with our comparison devices in our iperf3 Client Wi-Fi tests.
Trekstor preinstalls the C11B with Windows 10 Home with S mode enabled, which restricts users to only installing programs from the Microsoft Store. S-mode can be deactivated though, the instructions for which Microsoft lists on its FAQ pages.
Our test device came with plenty of software preinstalled to help students with their studies. Trekstor includes a one-year license for MS Office 365 Personal, Sofatutor.com, Klett digital textbooks, Pons online dictionary and an Intel software suite. Our test device also had a German-language manual in the book that describes how to install and activate the various software packages for which Trekstor includes licences.
Connectivity
| SD Card Reader | |
| average JPG Copy Test (av. of 3 runs) | |
| Average of class Convertible (17.7 - 209, n=36, last 2 years) | |
| Lenovo Yoga 330-11IGM (Toshiba Exceria Pro SDXC 64 GB UHS-II) | |
| Asus VivoBook E12 E203NA-FD026T (Toshiba Exceria Pro M501 microSDXC 64GB) | |
| Trekstor Primebook C11 (Toshiba Exceria Pro M501 microSDXC 64GB) | |
| Medion Akoya E2228T-MD61250 (Toshiba Exceria Pro M501 microSDXC 64GB) | |
| Dell Chromebook 11 3181 2-in-1 (Toshiba Exceria Pro M501 UHS-II) | |
| maximum AS SSD Seq Read Test (1GB) | |
| Average of class Convertible (22.6 - 263, n=35, last 2 years) | |
| Lenovo Yoga 330-11IGM (Toshiba Exceria Pro SDXC 64 GB UHS-II) | |
| Asus VivoBook E12 E203NA-FD026T (Toshiba Exceria Pro M501 microSDXC 64GB) | |
| Medion Akoya E2228T-MD61250 (Toshiba Exceria Pro M501 microSDXC 64GB) | |
| Trekstor Yourbook C11B (Toshiba Exceria Pro M501 microSDXC 64GB) | |
| Trekstor Primebook C11 (Toshiba Exceria Pro M501 microSDXC 64GB) | |
| Networking | |
| iperf3 transmit AX12 | |
| Asus VivoBook E12 E203NA-FD026T | |
| Asus VivoBook Flip 12 TP203NAH-BP049T | |
| Trekstor Yourbook C11B | |
| Lenovo Yoga 330-11IGM | |
| Medion Akoya E2228T-MD61250 | |
| Trekstor Primebook C11 | |
| iperf3 receive AX12 | |
| Asus VivoBook Flip 12 TP203NAH-BP049T | |
| Asus VivoBook E12 E203NA-FD026T | |
| Trekstor Primebook C11 | |
| Trekstor Yourbook C11B | |
| Lenovo Yoga 330-11IGM | |
| Medion Akoya E2228T-MD61250 | |
Input Devices
Our test device has an unlit chiclet QWERTZ keyboard that has slightly roughened keys. The keys have a short stroke and a clear pressure point that feels ok to type on, but they are a little too mushy for our liking. Moreover, the keyboard deck gives way slightly when typing. Overall, the keyboard’s shortcomings did not prove annoying during testing and the keyboard is decent considering the C11B’s price.
The multi-touch trackpad measures around 10.5 x 6 cm, within which Trekstor has integrated a fingerprint sensor. The sensor sits in the top left-hand corner of the trackpad, but it does not interfere with making multi-touch gestures. The trackpad has a smooth finish that is easy to use, while its two mouse buttons have a short stroke and a clear pressure point.
Display
The C11B has an 11.6-inch touchscreen display that operates at a 1920x1080 native resolution. Our test device has an average maximum brightness of 266.7 cd/m² according to X-Rite i1Pro 2, which is too dark for our liking. However, it is brighter than many of our comparison devices and should be bright enough for indoor use. Our test device also has an impressively low 0.28 cd/m² black value and a comparatively high 1,086:1 contrast ratio.
Unfortunately, our test device uses pulse-width modulation (PWM) to regulate display brightness, which causes the display to flicker at 200 Hz when at and below 20% brightness. This is a relatively low PWM frequency that will likely cause eye strain or headaches for those who are PWM sensitive.
| |||||||||||||||||||||||||
Brightness Distribution: 77 %
Center on Battery: 307 cd/m²
Contrast: 1086:1 (Black: 0.28 cd/m²)
ΔE Color 7.28 | 0.5-29.43 Ø5, calibrated: 1.89
ΔE Greyscale 8.34 | 0.57-98 Ø5.3
92% sRGB (Argyll 1.6.3 3D)
60% AdobeRGB 1998 (Argyll 1.6.3 3D)
65.7% AdobeRGB 1998 (Argyll 2.2.0 3D)
92.5% sRGB (Argyll 2.2.0 3D)
64.4% Display P3 (Argyll 2.2.0 3D)
Gamma: 2.33
| Trekstor Yourbook C11B IPS, 1920x1080, 11.60 | Trekstor Primebook C11 IPS, 1920x1080, 11.60 | Lenovo Yoga 330-11IGM TN LED, 1366x768, 11.60 | Medion Akoya E2228T-MD61250 IPS, 1920x1080, 11.60 | Asus VivoBook E12 E203NA-FD026T TN LED, 1366x768, 11.60 | Dell Chromebook 11 3181 2-in-1 IPS, 1366x768, 11.60 | Asus VivoBook Flip 12 TP203NAH-BP049T IPS, 1366x768, 11.60 | |
|---|---|---|---|---|---|---|---|
| Display | 1% | -36% | -13% | -40% | -30% | ||
| Display P3 Coverage | 64.4 | 64.9 1% | 40.42 -37% | 59.3 -8% | 37.95 -41% | 44.23 -31% | |
| sRGB Coverage | 92.5 | 92.8 0% | 60.8 -34% | 77.3 -16% | 57.1 -38% | 66.3 -28% | |
| AdobeRGB 1998 Coverage | 65.7 | 66.2 1% | 41.76 -36% | 56.5 -14% | 39.21 -40% | 45.73 -30% | |
| Response Times | 1% | 12% | 20% | 34% | -8% | 15% | |
| Response Time Grey 50% / Grey 80% * | 42 ? | 41 ? 2% | 50 ? -19% | 30 ? 29% | 41 ? 2% | 52.8 ? -26% | 39 ? 7% |
| Response Time Black / White * | 32 ? | 32 ? -0% | 14 ? 56% | 22 ? 31% | 11 ? 66% | 28.8 ? 10% | 25 ? 22% |
| PWM Frequency | 200 ? | 200 ? 0% | 200 ? 0% | 200 ? 0% | |||
| Screen | -7% | -44% | 18% | -27% | 9% | 15% | |
| Brightness middle | 304 | 272 -11% | 224 -26% | 504 66% | 253 -17% | 213 -30% | 253 -17% |
| Brightness | 267 | 249 -7% | 213 -20% | 497 86% | 234 -12% | 218 -18% | 245 -8% |
| Brightness Distribution | 77 | 81 5% | 80 4% | 86 12% | 87 13% | 94 22% | 65 -16% |
| Black Level * | 0.28 | 0.44 -57% | 0.52 -86% | 0.52 -86% | 0.33 -18% | 0.21 25% | 0.17 39% |
| Contrast | 1086 | 618 -43% | 431 -60% | 969 -11% | 767 -29% | 1014 -7% | 1488 37% |
| Colorchecker dE 2000 * | 7.28 | 6.36 13% | 11.64 -60% | 4.48 38% | 10.84 -49% | 3.52 52% | 3.17 56% |
| Colorchecker dE 2000 max. * | 12.65 | 11.06 13% | 20.8 -64% | 9.38 26% | 17.48 -38% | 18.36 -45% | 8.13 36% |
| Colorchecker dE 2000 calibrated * | 1.89 | ||||||
| Greyscale dE 2000 * | 8.34 | 7.15 14% | 13.4 -61% | 1.63 80% | 11.86 -42% | 2.6 69% | 2 76% |
| Gamma | 2.33 94% | 2.47 89% | 2.57 86% | 2.41 91% | 2.72 81% | 2.283 96% | 2.43 91% |
| CCT | 9038 72% | 8664 75% | 15186 43% | 6715 97% | 12882 50% | 6861 95% | 6850 95% |
| Color Space (Percent of AdobeRGB 1998) | 60 | 60 0% | 38 -37% | 51 -15% | 36 -40% | 42 -30% | |
| Color Space (Percent of sRGB) | 92 | 93 1% | 61 -34% | 77 -16% | 57 -38% | 66 -28% | |
| Total Average (Program / Settings) | -2% /
-4% | -23% /
-32% | 8% /
13% | -11% /
-21% | 1% /
5% | 0% /
6% |
* ... smaller is better
Screen Flickering / PWM (Pulse-Width Modulation)
| Screen flickering / PWM detected | 200 Hz | ≤ 20 % brightness setting |  |
The display backlight flickers at 200 Hz (worst case, e.g., 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 17903 (minimum: 5 - maximum: 3846000) Hz was measured. | |||
Our test device had a DeltaE 2000 ColorChecker deviation of 7.28 out of the box, which is noticeably higher than the ideal value of 3. The display also had a blue tint to it too. Calibrating the display worked wonders though and caused the ColorChecker deviation to drop to 1.89, while it also removed the blue tint and produced more balanced greyscale reproduction.
We have included our calibrated ICC profile in the box above our comparison table should you wish to use it with your device. However, please ensure that the display in your C11B carries the same model number as the one in our test device; ODMs and OEMs regularly use multiple displays from different manufacturers for the same laptop model. Otherwise, our ICC profile may worsen the colour accuracy of your device’s display. It is easy to switch back to original settings within Windows, but we would not want you to waste your time unnecessarily.
Display 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 0.1 (minimum) to 240 (maximum) ms. » 84 % of all devices are better. This means that the measured response time is worse than the average of all tested devices (21.5 ms). | ||
| ↔ Response Time 50% Grey to 80% Grey | ||
| 42 ms ... rise ↗ and fall ↘ combined | ↗ 21 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 0.2 (minimum) to 636 (maximum) ms. » 63 % of all devices are better. This means that the measured response time is worse than the average of all tested devices (33.7 ms). | ||
The C11B has strong viewing angles thanks to its IPS display, hence the screen is readable from practically any position. However, using the C11B outdoors is almost impossible. The display simply is not bright enough to read the screen outside even on a cloudy day.
Performance
The C11B is specifically aimed at students, while its processor is only powerful enough for simple office and Internet applications. Trekstor currently sells the C11B for around 350 Euros (~$400/£305). There are no other variants besides the pink version.
Processor
Trekstor has equipped the C11B with an Intel Celeron N3350 Apollo Lake dual-core processor. The 14 nm chip has a 6 W thermal design power (TDP), which is low enough to be passively cooled. The N3350 has a 1.1 GHz clock speed that can increase up to 2.3 GHz across both cores and 2.4 GHz during single-core tasks. The processor does not support Intel Hyper-Threading or Turbo Boost technologies. The CPU in our test device constantly averaged 2.2-2.3 GHz during testing on both battery and mains power.
We checked whether how well the C11B maintained its initial CPU performance by subjecting it to a loop of the Cinebench R15 multi-core benchmark that lasted around 30 minutes. As the below graph demonstrates, our test device performed consistently throughout the looped benchmark and did not thermal throttle. The data for the C11B is coloured red.
| Cinebench R15 | |
| CPU Single 64Bit | |
| Average of class Convertible (68.6 - 287, n=66, last 2 years) | |
| Lenovo Yoga 330-11IGM | |
| Asus VivoBook E12 E203NA-FD026T | |
| Trekstor Yourbook C11B | |
| Average Intel Celeron N3350 (43 - 48, n=9) | |
| Trekstor Primebook C11 | |
| Medion Akoya E2228T-MD61250 | |
| CPU Multi 64Bit | |
| Average of class Convertible (110.1 - 2889, n=68, last 2 years) | |
| Lenovo Yoga 330-11IGM | |
| Medion Akoya E2228T-MD61250 | |
| Asus VivoBook E12 E203NA-FD026T | |
| Average Intel Celeron N3350 (81 - 92, n=9) | |
| Trekstor Yourbook C11B | |
| Trekstor Primebook C11 | |
| Cinebench R10 | |
| Rendering Single 32Bit | |
| Average of class Convertible (6243 - 10510, n=6, last 2 years) | |
| Lenovo Yoga 330-11IGM | |
| Average Intel Celeron N3350 (1458 - 1917, n=5) | |
| Trekstor Yourbook C11B | |
| Asus VivoBook E12 E203NA-FD026T | |
| Medion Akoya E2228T-MD61250 | |
| Rendering Multiple CPUs 32Bit | |
| Average of class Convertible (19430 - 53525, n=6, last 2 years) | |
| Lenovo Yoga 330-11IGM | |
| Medion Akoya E2228T-MD61250 | |
| Asus VivoBook E12 E203NA-FD026T | |
| Average Intel Celeron N3350 (1775 - 2787, n=5) | |
| Trekstor Yourbook C11B | |
| Geekbench 3 | |
| 32 Bit Multi-Core Score | |
| Lenovo Yoga 330-11IGM | |
| Trekstor Yourbook C11B | |
| Average Intel Celeron N3350 (2409 - 2526, n=2) | |
| Asus VivoBook E12 E203NA-FD026T | |
| Medion Akoya E2228T-MD61250 | |
| 32 Bit Single-Core Score | |
| Lenovo Yoga 330-11IGM | |
| Asus VivoBook E12 E203NA-FD026T | |
| Average Intel Celeron N3350 (1314 - 1341, n=2) | |
| Trekstor Yourbook C11B | |
| Medion Akoya E2228T-MD61250 | |
| Geekbench 4.0 | |
| 64 Bit Multi-Core Score | |
| Lenovo Yoga 330-11IGM | |
| Trekstor Yourbook C11B | |
| Average Intel Celeron N3350 (2529 - 2648, n=3) | |
| Asus VivoBook E12 E203NA-FD026T | |
| Medion Akoya E2228T-MD61250 | |
| 64 Bit Single-Core Score | |
| Lenovo Yoga 330-11IGM | |
| Asus VivoBook E12 E203NA-FD026T | |
| Average Intel Celeron N3350 (1464 - 1510, n=3) | |
| Trekstor Yourbook C11B | |
| Medion Akoya E2228T-MD61250 | |
| Geekbench 4.4 | |
| 64 Bit Multi-Core Score | |
| Average of class Convertible (3462 - 30452, n=7, last 2 years) | |
| Lenovo Yoga 330-11IGM | |
| Trekstor Yourbook C11B | |
| Average Intel Celeron N3350 (2427 - 2731, n=4) | |
| Asus VivoBook E12 E203NA-FD026T | |
| Medion Akoya E2228T-MD61250 | |
| 64 Bit Single-Core Score | |
| Average of class Convertible (1989 - 6801, n=7, last 2 years) | |
| Lenovo Yoga 330-11IGM | |
| Asus VivoBook E12 E203NA-FD026T | |
| Trekstor Yourbook C11B | |
| Average Intel Celeron N3350 (1374 - 1529, n=4) | |
| Medion Akoya E2228T-MD61250 | |
| Mozilla Kraken 1.1 - Total | |
| Dell Chromebook 11 3181 2-in-1 (Version 69.0.3497.100) | |
| Trekstor Yourbook C11B (Edge 42) | |
| Average Intel Celeron N3350 (3108 - 4230, n=9) | |
| Average of class Convertible (472 - 3989, n=66, last 2 years) | |
| Octane V2 - Total Score | |
| Average of class Convertible (70338 - 92146, n=14, last 2 years) | |
| Average Intel Celeron N3350 (8457 - 11461, n=6) | |
| Trekstor Yourbook C11B (Edge 42) | |
| Dell Chromebook 11 3181 2-in-1 (Version 69.0.3497.100) | |
| JetStream 1.1 - Total Score | |
| Average of class Convertible (338 - 443, n=4, last 2 years) | |
| Lenovo Yoga 330-11IGM (Edge 42) | |
| Asus VivoBook E12 E203NA-FD026T (Edge 41) | |
| Trekstor Yourbook C11B (Edge 42) | |
| Average Intel Celeron N3350 (49.9 - 79.1, n=9) | |
| Dell Chromebook 11 3181 2-in-1 (Version 69.0.3497.100) | |
| Medion Akoya E2228T-MD61250 (Edge 41) | |
* ... smaller is better
System Performance
Our test device performed smoothly and felt snappy throughout testing. We encountered no problems either, while the N3350 proved powerful enough for simple office and Internet applications. We would recommend refraining from opening more than two web-browser windows though as doing so tends to slow the system down considerably. PCMark scores on par for the average of N3350-powered devices that we have already tested.
| PCMark 8 Home Score Accelerated v2 | 1700 points | |
| PCMark 8 Creative Score Accelerated v2 | 1814 points | |
| PCMark 8 Work Score Accelerated v2 | 2370 points | |
| PCMark 10 Score | 1208 points | |
Help | ||
| PCMark 8 - Home Score Accelerated v2 | |
| Average of class Convertible (4404 - 5830, n=3, last 2 years) | |
| Lenovo Yoga 330-11IGM | |
| Asus VivoBook Flip 12 TP203NAH-BP049T | |
| Asus VivoBook E12 E203NA-FD026T | |
| Trekstor Yourbook C11B | |
| Average Intel Celeron N3350, Intel HD Graphics 500 (1462 - 1816, n=8) | |
| Trekstor Primebook C11 | |
| Medion Akoya E2228T-MD61250 | |
Storage Devices
Trekstor has preinstalled a 64 GB eMMC drive, of which 41 GB is free to use out of the box. The remaining space is taken up by Windows 10 and the Recovery partition. The transfer rates are slower than many of our comparison devices but are above the average of those devices that we have tested that are equipped with 64 GB of eMMC.
Fortunately, it is comparatively easy to remove the M.2-2242 SSD should you wish to use a larger drive than the default one. Trekstor has incorporated a maintenance cover on the underside of the device for easy SSD replacement, which is secured by a single Phillips head screw. You could also expand the memory with a microSD card.
| Trekstor Yourbook C11B 64 GB eMMC Flash | Trekstor Primebook C11 SanDisk DF4064 | Lenovo Yoga 330-11IGM 128 GB eMMC Flash | Medion Akoya E2228T-MD61250 64 GB eMMC Flash | Asus VivoBook E12 E203NA-FD026T 32 GB eMMC Flash | Asus VivoBook Flip 12 TP203NAH-BP049T Seagate Mobile HDD 1TB ST1000LM035 | Average 64 GB eMMC Flash | Average of class Convertible | |
|---|---|---|---|---|---|---|---|---|
| CrystalDiskMark 3.0 | 17% | 32% | -15% | 17% | -73% | -4% | 1984% | |
| Read Seq | 261.1 | 265.4 2% | 293.4 12% | 119.3 -54% | 276.6 6% | 53.9 -79% | 145.5 ? -44% | 2313 ? 786% |
| Write Seq | 117.6 | 111.2 -5% | 91.9 -22% | 41.38 -65% | 78.3 -33% | 66.4 -44% | 60.7 ? -48% | 3482 ? 2861% |
| Read 512 | 203.8 | 205.4 1% | 239.6 18% | 101.3 -50% | 238.1 17% | 22.62 -89% | 127.2 ? -38% | 1510 ? 641% |
| Write 512 | 59 | 85.3 45% | 76.3 29% | 34.28 -42% | 43.83 -26% | 67.3 14% | 49.3 ? -16% | 2590 ? 4290% |
| Read 4k | 5.325 | 9.175 72% | 13.66 157% | 10.74 102% | 8.963 68% | 0.378 -93% | 12.2 ? 129% | 58.9 ? 1006% |
| Write 4k | 9.04 | 8.721 -4% | 12.58 39% | 11.3 25% | 10.17 13% | 0.263 -97% | 9.29 ? 3% | 160.2 ? 1672% |
| Read 4k QD32 | 28.67 | 32.66 14% | 36.75 28% | 14.76 -49% | 29.66 3% | 0.998 -97% | 24.8 ? -13% | 381 ? 1229% |
| Write 4k QD32 | 12.9 | 14.19 10% | 12.47 -3% | 14.57 13% | 24.63 91% | 0.518 -96% | 12.1 ? -6% | 450 ? 3388% |
Graphics Card
The N3350 integrates an Intel HD Graphics 500 GPU, which handles graphics. The GPU supports DirectX 12 and can clock up to 650 MHz. 3DMark benchmark results are at an expected level for this GPU, while it can also decode H.264, HEVC, H.265, VP8 and VP9 videos, which helps to free up the CPU.
| 3DMark 11 Performance | 620 points | |
| 3DMark Ice Storm Standard Score | 25262 points | |
| 3DMark Cloud Gate Standard Score | 2280 points | |
| 3DMark Fire Strike Score | 401 points | |
Help | ||
| 3DMark 11 - 1280x720 Performance GPU | |
| Average of class Convertible (471 - 40768, n=66, last 2 years) | |
| Lenovo Yoga 330-11IGM | |
| Asus VivoBook Flip 12 TP203NAH-BP049T | |
| Trekstor Yourbook C11B | |
| Trekstor Primebook C11 | |
| Asus VivoBook E12 E203NA-FD026T | |
| Average Intel HD Graphics 500 (368 - 584, n=11) | |
| Medion Akoya E2228T-MD61250 | |
Gaming Performance
The C11B is a budget device that can only play old games at low resolutions and graphics. We have included a comparison table below, which demonstrates the extent of the C11B’s gaming capabilities. Only StarCraft 2 ran at playable frame rates of the 17 games that we benchmarked on our test device. Overall, the C11B should handle simple or casual games that are downloadable from the Microsoft Store.
| low | med. | high | ultra | QHD | |
| StarCraft 2 (2010) | 54.5 | 14.1 | |||
| Diablo III (2012) | 22 | 13.6 | |||
| Counter-Strike: GO (2012) | 16.6 | 14 | |||
| BioShock Infinite (2013) | 24.3 | 11 | 9.7 | 2.7 | |
| Middle-earth: Shadow of Mordor (2014) | 17.7 | ||||
| Dota 2 Reborn (2015) | 22.1 | 15.3 | |||
| Rainbow Six Siege (2015) | 15.5 | ||||
| Overwatch (2016) | 15.9 | ||||
| For Honor (2017) | 8.7 | ||||
| Prey (2017) | 4.9 | ||||
| Team Fortress 2 (2017) | 18.2 | 17.2 | |||
| Middle-earth: Shadow of War (2017) | 10 | ||||
| Far Cry 5 (2018) | 1 | 1 | |||
| The Crew 2 (2018) | 5.5 | ||||
| F1 2018 (2018) | 12 | ||||
| Shadow of the Tomb Raider (2018) | 3 | ||||
| Assassin´s Creed Odyssey (2018) | 2 |
Emissions & Energy
Fan Noise
The C11B has a fanless design and no mechanical drive, which allowed it to work silently throughout testing.
Temperature
Our test device performed equally well in our one hour combined Prime95 and FurMark stress test on battery or on mains power. The CPU initially clocks up to 2.3 GHz across both cores but drops to 1.9 GHz after a few seconds. The clock speed then drops again to 1.7-1.8 GHz as the stress test progresses. Likewise, the GPU starts the stress test at around 600-650 MHz but drops to 300-350 MHz by the end of the hour. The CPU and GPU cannot maintain their peak clock speeds as they share the same 6 W TDP.
The C11B heats up too much for our liking under load. Our stress test causes surface temperatures to reach a maximum of 49 °C on one area of the top case, while a third of the device reaches or gets near to 40 °C. Your experience should vary though as our stress tests are extreme scenarios that will not occur in daily use. We conduct our stress tests to verify that our test devices are stable under sustained load. Conversely, surface temperatures do not exceed 30 °C when the C11B is idling.
(-) The maximum temperature on the upper side is 49 °C / 120 F, compared to the average of 35.3 °C / 96 F, ranging from 19.6 to 55.7 °C for the class Convertible.
(±) The bottom heats up to a maximum of 41.4 °C / 107 F, compared to the average of 36.7 °C / 98 F
(+) In idle usage, the average temperature for the upper side is 25.9 °C / 79 F, compared to the device average of 30.2 °C / 86 F.
(-) The palmrests and touchpad can get very hot to the touch with a maximum of 45.8 °C / 114.4 F.
(-) The average temperature of the palmrest area of similar devices was 28.1 °C / 82.6 F (-17.7 °C / -31.8 F).
Speakers
The C11B has stereo speakers that sit behind the grille above the keyboard. The speakers produce a rather thin sound that lacks bass as would be expected for a device at this price. We would recommend using headphones or external speakers for a better listening experience.
Trekstor Yourbook C11B audio analysis
(-) | not very loud speakers (68.5 dB)
Bass 100 - 315 Hz
(-) | nearly no bass - on average 27% lower than median
(+) | bass is linear (6.8% delta to prev. frequency)
Mids 400 - 2000 Hz
(±) | higher mids - on average 6.8% higher than median
(±) | linearity of mids is average (12.6% delta to prev. frequency)
Highs 2 - 16 kHz
(±) | higher highs - on average 8.9% higher than median
(+) | highs are linear (6.9% delta to prev. frequency)
Overall 100 - 16.000 Hz
(-) | overall sound is not linear (35.9% difference to median)
Compared to same class
» 94% of all tested devices in this class were better, 1% similar, 5% worse
» The best had a delta of 6%, average was 21%, worst was 57%
Compared to all devices tested
» 93% of all tested devices were better, 1% similar, 7% worse
» The best had a delta of 4%, average was 25%, worst was 134%
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 (10.2% difference to median)
Compared to same class
» 5% of all tested devices in this class were better, 2% similar, 93% worse
» The best had a delta of 5%, average was 19%, worst was 53%
Compared to all devices tested
» 3% of all tested devices were better, 1% similar, 96% worse
» The best had a delta of 4%, average was 25%, worst was 134%
Power Consumption
The C11B is a relatively power-efficient device. Our test device consumes a maximum of 7 W at idle, while the system drew a maximum of 24.7 W during our stress test. Trekstor includes a 24 W power supply in the box, which should be powerful enough to charge the device even when you are pushing it hard.
| Off / Standby |   0.5 / 0.39 Watt |
| Idle |  3.2 / 6.1 / 7 Watt |
| Load |
/ 24.7 Watt |
    
| |
Battery Life
The C11B has a 36.48 Wh battery, which lasted for 8 h 22 m in our Wi-Fi battery life test, during which we run a script that simulates the load required to render websites. We conducted this test by setting the Windows 10 Power mode to “Balanced”, disabling energy-saving features and setting the display to approximately 150 cd/m². The C11B has above-average battery life that is also better than most of our comparison devices.
| Battery Runtime - WiFi Websurfing | |
| Dell Chromebook 11 3181 2-in-1 | |
| Average of class Convertible (329 - 876, n=64, last 2 years) | |
| Lenovo Yoga 330-11IGM | |
| Trekstor Yourbook C11B | |
| Asus VivoBook E12 E203NA-FD026T | |
| Medion Akoya E2228T-MD61250 | |
| Trekstor Primebook C11 | |
| Asus VivoBook Flip 12 TP203NAH-BP049T | |
Pros
Cons
Verdict
The Trekstor Yourbook C11B is an 11.6-inch convertible that is suited for students who primarily use MS Office and browse the Internet. The Celeron N3350 is not a powerful CPU but the system feels snappy if you do not push it too hard. The integrated GPU also frees up CPU resources by decoding videos, so the C11B can handle video-streaming services like Amazon Video or Netflix too.
The Trekstor Yourbook C11B is an affordable writing and surfing convertible that is suitable for light use.
The C11B has just 64 GB of eMMC storage out of the box, but Trekstor makes it easy to swap out the M.2-2242 SSD should you need more storage. You could also add a microSD card for more storage if you are not feeling as adventurous.
The keyboard is good overall, but its lack of backlighting is disappointing. The C11B has decent battery life too, while its IPS touchscreen has a strong contrast ratio and viewing angles. We would have preferred a brighter display though for using the device outside. Positively, Trekstor has included a USB Type-C port for data, power or video.
The C11B also scores well for its included software licenses. Trekstor has included a one-year subscription to MS Office 365 Personal and Sofatutor.com, the latter of which usually costs as much as the C11B for a year’s license. Trekstor also sells the Primebook C11 for around 300 Euros ($343/£261) should you not need the software that is included with the C11B. In short, the Yourbook C11B is a solid budget convertible for students that comes with useful software.
Trekstor Yourbook C11B
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09/26/2019 v7
Sascha Mölck
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