Battery Life

Performance isn’t the only benefit that comes with Tegra 4 – NVIDIA and Microsoft also enjoy a smaller/lower power process: TSMC’s 28nm HPL. Of course four high-clocked Cortex A15 cores drives max power consumption higher than on Tegra 3, but idle power consumption and power efficiency at lower clock speeds should be better. As with most present day mobile devices, the move from Surface to Surface 2 comes with an increase in dynamic range of power consumption. I put Surface 2 (as well as Surface RT) through our 2013 tablet/smartphone web browsing battery life test and came away with around 8 hours of use on a single charge. That’s definitely not the lowest power that we’ve seen, but it is an improvement over the 6.8 hours Surface RT managed in the same test.

Web Browsing Battery Life (WiFi)

As with all modern Tegra SoCs there’s one extra “companion” core designed to be used for lower power/performance operation. Unlike under Android, there’s no hot plugging of CPU cores under Windows RT – there are always four Cortex A15s presented to the OS/scheduler, regardless of whether or not the companion core is active. Microsoft tells me the companion core is used on Surface 2 (unlike its predecessor), however specifics are tough to come by. Microsoft claims the companion core is used during full screen video playback. The only thing I can think of is that the hardware migrates the companion core in under certain circumstances, taking the place of one of the four A15s, and software specifically sets processor affinity in this case. I tried confirming whether or not this was the case by playing a movie and inspecting the process under task manager, unfortunately I came up empty handed. The video playback process wasn’t set to run on any one core in particular, it was allowed to run on all four exposed cores.

Video Playback Battery Life (720p, 4Mbps HP H.264)

However it’s used, the impact seems to work relatively well. Surface 2 managed just over 10 hours of battery life in our video playback test. It’s not the best we’ve seen in this test, but it’s definitely competitive with other flagship devices.


Surface 2 ships with Windows RT 8.1, and similarly absorbs all of the improvements that 8.1 brought to x86 machines as well. A number of ARM specific optimizations are under the hood, which should help improve both performance and power consumption.

The biggest issue with Surface 2 remains on the software front. Developer support for Windows Store applications is no where near where I thought it would be by now. There are some big ones (Netflix, Facebook), but there’s still no good Twitter client, no amazing IM client, and of course you don’t get good integration of Google services anywhere (outside of leveraging Mail for Gmail access).

Without opening up classic desktop APIs to developers, we won’t see alternative web browsers like Chrome or Firefox on Windows RT 8.1 either. Although IE11 does a relatively good job on the touch front, I find that heavy multitasking with IE11 on Surface 2 can result in a lot of hangs and crashes within tabs or the application itself. I can understand Microsoft’s hesitation on this front (better control over the platform if you don’t open it up), but I can’t see a future where Windows RT is successful and Microsoft doesn’t allow developers to access both sides of the platform.

SoC, CPU & Performance Final Words
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  • Silellak - Monday, October 21, 2013 - link

    "But is Google's ecosystem really the best cross-platform choice? The way I see it is everything that MS has is available on Windows/iOS/Android."

    Everything except their browser, which is the thing I used the most every day on OSX, Windows 7, and Ubuntu. Kind of a gaping hole for me.
  • Klimax - Tuesday, October 22, 2013 - link

    Talk to Google, because IIRC browsers are exempt from certain restrictions on API.
  • Wolfpup - Thursday, October 31, 2013 - link

    Skydrive no longer works with Windows, so I wouldn't say it works everywhere.
  • Check101 - Monday, October 21, 2013 - link

    Only reason I take Google Drive over SkyDrive is being able to work with group members on a document simultaneously and have a chatbox and edit in real time. SkyDrive's collaboration and sharing options are much fewer. Otherwise, I just use Gmail and Google Calendar, and even those aren't that good. :P
  • A5 - Monday, October 21, 2013 - link

    Because MS sells the group stuff as Sharepoint, which is part of Office.
  • RannXeroxx - Sunday, November 24, 2013 - link

    You can live edit with Office Web App and it even allows users of full Office to join in the editing. Just login to a SkyDrive account and have at it. And using your account you can message via skype, facebook, or MS messager.
  • trane - Monday, October 21, 2013 - link

    Completely agreed. I was a Google user myself, but after switching to Microsoft, their ecosystem for the basic stuff is simply far suprior. Office, Outlook, Skype, Skydrive, Bing apps, Xbox Music simply fulfill my needs far better than anything from Google or Apple.

    The only thing that Google does better is Maps - and that has apps like Gmaps, and of course, Google Maps website works fine in IE11. If you are a Gmail user, the Windows 8.1 Mail app is pretty good too, but of course, works best with an Outlook account. And arguably, photos with Google+, but who uses Google+ anyway?
  • EnzoFX - Monday, October 21, 2013 - link

    Interesting. I've found every service I use of theirs is subpar.
  • Papaspud - Monday, October 21, 2013 - link

    You will find what you seek...........
  • RannXeroxx - Friday, November 29, 2013 - link

    In what way is either or MS Office Web Apps "sub-par" to Gmail or Google Docs? I do love me some Google Voice, that service just rules but not sure how much longer Google will offer that for free.

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