The SoC: TI's OMAP 4460

The launch platform for Ice Cream Sandwich was TI's OMAP 4460. Unlike previous Android releases however, it seems that other SoCs will see their ICS ports done in a much quicker manner. It took a very long time for Honeycomb to be ported to other SoCs, whereas a number of companies have already demonstrated ICS running on their hardware (e.g. Intel, NVIDIA). If this is the case going forward, the launch vehicle for a new Android version may not mean what it used to.

The OMAP 4460 is a fairly standard, yet full featured dual-core ARM Cortex A9 SoC. You get two A9 cores complete with MPE (NEON support), behind a shared 1MB L2 cache. The SoC features two 32-bit LPDDR2 memory channels as well. The GPU is provided by Imagination Technologies in the form of a PowerVR SGX 540.

Max clocks for the OMAP 4460 are 1.5GHz for the CPUs and 384MHz for the GPU. As with all SoCs, all final clocks are OEM customizable to hit their desired point on the performance/battery life curve. Google and Samsung settled on 1.2GHz for the cores and 307MHz for the GPU, both exactly 80% of the OMAP 4460's max frequencies. Sprint recently announced its Galaxy Nexus would run at 1.5GHz. It's quite possible that we'll see a jump in GPU clocks there as well since the two may run in lockstep.

From a CPU standpoint the 4460 is competitive with pretty much everything else on the market (A5, Exynos, Tegra 2, Snapdragon S3). The 4460 does have more memory bandwidth than Tegra 2, Tegra 3 and Snapdragon, but it's comparable to Apple's A5 and Samsung's Exynos 4210. It's the GPU that's a bit dated at this point; the PowerVR SGX 540 typically delivers Tegra 2-class performance. A quick look at GLBenchmark and Basemark results echoes our findings:

GLBenchmark 2.1 - Egypt - Offscreen (720p)
 
GLBenchmark 2.1 - Pro - Offscreen (720p)
 
RightWare Basemark ES 2.0 V1 - Taiji
 
RightWare Basemark ES 2.0 V1 - Hoverjet

At 720p, which happens to be the GN's native resolution, the OMAP 4460 is much faster than Tegra 2. It's also important to note just how much faster Tegra 3's GPU is by comparison.

I understand why Google didn't wait for a Krait based SoC, however I don't believe the OMAP 4460 was the best bet given the launch timeframe of the Galaxy Nexus. Based on performance alone, Google should have picked Tegra 3 as the launch platform for ICS. GPU performance is much better than the SGX 540 and there's comparable CPU performance. It's possible that Google needed the memory bandwidth offered by OMAP 4, but we'll find out for sure soon enough as the first Tegra 3 device (ASUS' TF Prime) is slated to get ICS this week.

I'm also less concerned about power consumption being an issue since NVIDIA added full power gating to all of the cores in Tegra 3. With a conservative enough power profile Google could have guaranteed battery life similar to OMAP 4460 out of Tegra 3.

I get the feeling that Google wasn't very pleased with NVIDIA after Honeycomb and chose to work with TI this time around for reasons other than absolute performance. If it weren't for the fact that Tegra 3 and other SoCs appear to be getting ICS in fairly short form I'd be more upset over this decision. To be honest, the choice of SoC simply hurts the Galaxy Nexus as a phone. If I were you, I'd wait for a Krait based device.

The Galaxy Nexus - Hardware and Aesthetics Camera - Stills and Video
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  • zorxd - Thursday, January 19, 2012 - link

    And what exactly is more efficient? Reply
  • c4v3man - Thursday, January 19, 2012 - link

    Their implimention of pseudo-multitasking as opposed to the much more flexible multitasking in Android. Reply
  • erple2 - Friday, January 20, 2012 - link

    Bingo!

    Since the iOS can't do "true" multitasking, primarily as a design decision on Apple's part to greatly improve battery life (seen the battery life numbers on WebOS? They're pretty terrible), the requirements for memory are generally quite a bit lower than for Android.

    You could argue all day as to which one is better, and still not come up with a clear winner. This is strictly due to the phone form factor. Given the limitations on usable screen size (can't display 2 apps at once reliably), and that you have to rely on battery life, the argument of which is "better" is more difficult to make. These all disappear when power is no longer a serious concern (desktop), nor physical screen display (notebook through desktop).
    Reply
  • zorxd - Friday, January 20, 2012 - link

    yeah and DOS is better because it works fine with only 1MB RAM. Reply
  • OCedHrt - Friday, January 20, 2012 - link

    Which is fine due to fast app switching. Reply
  • trob6969 - Wednesday, January 18, 2012 - link

    You didn't have to sacrifice GPU performqnce for a 4.3 inch 720p HD display. You could have done what i did and got an htc rezound. I downloaded Dead space, which is probably one of the most GPU demanding games for a phone, and gameplay is FLAWLESS on it! ZERO choppiness throughout the game. My rezound plays this game just as smoothly as my playstation 3. That says a lot about a phone's performance. Reply
  • metafor - Wednesday, January 18, 2012 - link

    Note that with the increased clockspeed to the SGX540, the OMAP4460 matches the GPU performance of a Snapdragon S3 (used in the Rezound).

    Both chips perform similarly with the CPU clock at 1.2GHz (compare Sensation 4G to GN, for example).
    Reply
  • dwang - Wednesday, January 18, 2012 - link

    Deadspace runs perfectly fine on the galaxy nexus. No choppiness or slowdown. Reply
  • Zoomer - Thursday, January 19, 2012 - link

    TI probably didn't anticipate the move to such high resolutions. The 540 was probably chosen as a good enough solution, given the power reqs are well.

    This is where Apple's hardware-software codesign wins out.
    Reply
  • Johnmcl7 - Wednesday, January 18, 2012 - link

    That reasoning that microSD cards are too slow seems to only apply to some of the cheap phones which pretty only use micro SD storage, for a phone like the Nexus it doesn't matter as you say because the micro SD card is for storage rather than applications. I don't really understand why the Nexus doesn't get a harder time for the lack of microSD storage given the relatively low onboard storage and high spec which means it can play back high resolution video which needs quite a bit of space. It's one of the main reasons I went for the Note instead which has the better camera, faster GPU and the micro SD storage allowing me to add 32GB very cheaply (and more down the line when 64GB cards come down in price) which is pretty necessary as the high resolution video recording and other features chew through space very quickly.

    John
    Reply

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