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Trimming CPU power consumption to something in the 16 Watts range, possibly by deactivating Turbo Mode, would’ve significantly extended battery life.
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Torchlight illustrates how much Surface Pro would benefit from software profiles to control power consumption. We saw regular evidence of throttling at this point power consumption would peak at 33 to 35 Watts, drop back to 24 Watts, then peak again. When we increased detail levels to high and set the tablet to 1920 x 1080, fps fell by two thirds while power consumption sharply increased. At 1440 x 900 with details set to minimum, Surface Pro maintains a frame rate of nearly 100 frames per second (fps) and draws just 24 Watts. One of the interesting characteristics of Torchlight is the relationship between frame rate and power consumption. Surface Pro was tested at 1440 x 900 with details set to minimum levels and at 1920 x 1080 with details and antialiasing turned all the way up. We tested Torchlight on both the Ativ and Surface Pro, but the Ativ wasn’t able to maintain an acceptable frame rate – even with updated video drivers. The system has no stability problems and the fan is tuned to keep the chip at or below 80 degrees C. The Surface Pro’s fan – silent for the majority of our tests – kicks into overdrive on this test and when running Torchlight. The Clover Trail tablet can’t run the OpenGL test, so those results are omitted. System responsiveness during this test is basically nil.Īs for device power consumption, the comparison breaks down like this.Ĭinebench is also one of the few tests that really push the Core i5 3317U’s power consumption. Atom’s 4 to 7 Watt power consumption is dwarfed by Surface Pro’s 27 Watts in multi-threaded mode/20 Watts single-threaded, but it takes roughly two weeks to finish the single-threaded scene. CinebenchĬinebench is an excellent example of how the more powerful Core i5-3317U CPU can save total battery power by finishing tasks more quickly. The Surface Pro draws more power than the other tablets, thanks in part to the high-density screen. Installing the K-Lite codec pack and switching to Media Player Classic with hardware acceleration enabled fixed the stuttering problem, but it drew more power. The Ativ 500T consumed about 5 Watts while decoding with PowerDVD, but the video stuttered on a regular basis.
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The Ativ comes with PowerDVD’s Cyberlink suite – by default, MKV and MP4 file playback is handled by this utility. Before we dive into the results, we need to discuss the importance of playback software.
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Video playbackįor these tests, we used a 6.75GB MP4 movie encode (H.264 1920 x 800, 7.6Mbps). Real compatibility with MKV files remains a pipe dream for RT users, though the appearance of PressPlay gives us hope that a proper solution will present itself. It draws more power than Clover Trail, and takes more than twice as long to perform the same task. Surface RT performs remarkably poorly here. The video output couldn’t play back smoothly on any platform, but benchmarks available across all three platforms are few and far between. We decided to test the file conversion and power consumption using a 8.75GB MKV file as a baseline.
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Files that played flawlessly via Media Player Classic on Surface Pro and the Samsung Ativ stuttered when opened using PressPlay. The bad news? Files have to be converted every time you view them, there’s no option to save in the converted format, and the playback stutters.
Batterybar pro review windows#
There’s an app available from the Windows Store ( PressPlay) that converts MKV files into a format that the tablet can play. If you’ve been considering a Surface RT but don’t want to re-encode a library of MKV files, we’ve got good news for you. Surface Pro’s throughput-to-watt ratio is correspondingly lower, at 3.08. Surface Pro is twice as fast as the Ativ, thanks to USB 3.0, but that speed comes at a cost – file copying draws 18 Watts of power, nearly 2.5 times as much as Clover Trail. RT complements its poor performance with high power draw its MB/s throughput-to-power consumption ratio is 1.39 compared to the Samsung’s 3.8. Throughput is limited to 12.5MB/sec, less than half of Clover Trail’s. Surface RT’s copy performance is terrible.
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Copy speeds were tested three times, with a reboot between each. In the next test I copied an 8GB video file from a 16GB USB 3.0-capable thumb drive. Surface Pro supports USB 3.0, while the Ativ and RT models are limited to USB 2.0. Surface Pro also has a maximum brightness of 400 nits, but its display consumes more at minimum brightness than the others do at maximum.ġ2 Watts, however, isn’t enough to explain the dramatic battery life difference.