System Performance

One of the highlights of the Pixel C is the fact that it is powered by NVIDIA's Tegra X1 SoC. This technically isn't the first time that X1 has shown up in an Android device since it powers the SHIELD Android TV, but it's the first time it has been used in a mobile device. This implementation of Tegra X1 has four Cortex A57 cores with a peak frequency of 1.91GHz, along with four Cortex A53 cores. There are a few things that need to be mentioned about how Tegra X1 differs from other SoCs with eight cores. The first is the fact that in theory, Tegra X1 uses cluster migration rather than Heterogeneous Multi-processing. The reason I said in theory is because the implementation in the Pixel C is really only using the A57 cluster and scaling the frequency as low as 51MHz and as high as 1.91GHz.

In any case, all of our benchmarks should trigger the A57 cores in a mobile device that pairs A53 and A57 cores, so the discussion of the A53 cores being disabled is more relevant from a power consumption standpoint than a performance one. To analyze the general performance of the Pixel C I've run it through our standard JavaScript tests, along with PCMark and BaseMark OS II.

Kraken 1.1 (Chrome/Safari/IE)

Google Octane v2  (Chrome/Safari/IE)

WebXPRT 2015 (Chrome/Safari/IE)

Unfortunately, the Pixel C doesn't make a very strong showing in our JavaScript benchmarks. I can't help but feel that this is the result of a rushed Android build, as there are regressions compared to the Nexus 9 in Octane and Kraken, and in all cases the score just isn't that impressive. JavaScript performance is definitely something Google will have to work on in the future, as the gap between the performance of iOS and Android devices is growing fairly large.

Basemark OS II 2.0 - System

Basemark OS II 2.0 - Memory

Basemark OS II 2.0 - Graphics

Basemark OS II 2.0 - Web

Basemark OS II 2.0 - Overall

The Pixel C only achieves decent results in BaseMark OS II. The NAND memory score definitely drags down the overall rating, with the web score being lower than expected, and the system score being shocking low. The stand out score is in the graphics test, with the Pixel C only coming second to Apple's iPad Pro, and beating out the next best Android device, which is also NVIDIA-powered, by a huge margin. Unfortunately, high as it may be, Tegra X1's graphics performance just isn't enough to carry the Pixel C here.

PCMark - Web Browsing

PCMark - Video Playback

PCMark - Writing

PCMark - Photo Editing

PCMark - Work Performance Overall

PCMark paints a different picture than BaseMark OS II, and highlights how performance can be highly variable based on workload, software, and whether an app is run as a native binary or through ART. In PCMark the Pixel C performs exceptionally well, with the exception of the writing test which seems to have been impacted by some change made to ART on Google's devices when moving to Marshmallow. Putting that aside, we see quite high and often chart topping scores in the remaining tests, resulting in a final score that only sits below the Huawei Mate 8.

Characterizing the Pixel C's performance is difficult. PCMark paints a very good picture, and I'm tempted to lean toward it as it is representative of the tasks that users will perform on a daily basis. There's a bit more discussion to be had about the Pixel C's general performance, and that'll come a bit later in the software section of the review. What I can say is that Tegra X1 certainly is fast as far as raw speed goes, but there's more to be said about the Pixel C's performance when you consider the role of both hardware and software.

Intro and Design System Performance Cont'd and NAND Performance
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  • mmrezaie - Monday, January 25, 2016 - link

    Even my Nexus 5X is having numerous problems. It gets slow when I push it by taking three pictures in a minute, or when all of sudden I go from email app to google map. It is in a sad state. Reply
  • Maxpower2727 - Monday, January 25, 2016 - link

    Interesting. My Nexus 5x has no such issues. Reply
  • grayson_carr - Thursday, January 28, 2016 - link

    Mine doesn't either. He probably doesn't even have a Nexus 5X. Reply
  • hans_ober - Monday, January 25, 2016 - link

    Throttling graphs? Power measurements? Reply
  • JoshHo - Monday, January 25, 2016 - link

    These weren't possible because the units crashed or otherwise exhibited behavior that made it impossible to do proper testing. Reply
  • testbug00 - Tuesday, January 26, 2016 - link

    Ah, got to love how well Nvidia designs it's SoCs. You cannot use the small cluster, although I think their devboars might, and likely they cause the other problems in measurement.

    Ask Intel if they can tear into the Pixel C and try to isolate power numbers like they did long ago?
    Reply
  • osxandwindows - Monday, January 25, 2016 - link

    This can't compete with the iPad pro or surface.
    There are no tablet apps for android, simple as that.
    Sorry, google.
    But android is not really meant for tablets.
    Its more meant for phones.
    Reply
  • osxandwindows - Monday, January 25, 2016 - link

    Look at samsung, for example.
    They gave up on android and went with windows.
    Reply
  • Maxpower2727 - Monday, January 25, 2016 - link

    Is that why they're still making so many Android tablets? Reply
  • osxandwindows - Monday, January 25, 2016 - link

    No I meant the pro tablets from samsung. Reply

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