The Impact of Larger Memory

Apple doubled memory capacity on the new iPad to 1GB, marking the first time in recent history that Apple's flagship product offers a similar amount of memory to the current crop of high-end Android devices. Apple's iOS can do a relatively good job with limited system memory as it will conservatively unload applications from memory in the event that it needs to free up more space. iOS does not support paging to flash, making DRAM size a hard limit for developers looking to really push the platform.

Apple has always been conservative on DRAM sizing because it's a great way of reducing the BOM (Bill of Materials) cost. If Apple can make up for having less DRAM by being more aggressive in software (read: kicking apps out of memory), it's a tradeoff that makes sense. It's really Apple's foray into gaming that has added pressure to increase memory sizes.

With the move to the Retina Display, the amount of memory needed to store a single frame increases by 4x—from 3MB to 12MB. Assuming two buffered frames you're looking at 24MB of RAM just to smoothly display what you're seeing on the screen.

The bigger problem isn't the frame buffer, but rather all of the other data you need (e.g. level data, textures, etc...). The higher the screen resolution, the more important it is to have higher quality assets in your game. Texture compression can go a long way, but at some point there's simply more data to deal with as game complexity increases. It's not just about the increase in resolution either. As GPU horsepower increases, so will the complexity of what game developers try to build.

While the frame buffer size increased thanks to the Retina Display, total system memory increased by a much larger amount. With 1GB of memory, game developers are now less constrained.

A more immediate benefit is apps and web pages will remain resident in memory longer as you open open up and switch to other apps. For example, on the iPad 2 if I open four tabs in Safari (AT, Engadget, Reddit, and Tech Report), open iPhoto, run Infinity Blade 2 and GTA 3, switching between the latter two will always require a full game reload (as in you see the intro and everything before you pick up where you left off). On the new iPad, with the same setup, I can switch between Infinity Blade 2 and GTA 3 and automatically resume where I last left off thanks to the extra DRAM. You can still create a scenario where even 1GB isn't enough, it's just that the limit is now higher than it was on the iPad 2.

A Word on Packaging & Looking Forward GPU Performance
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  • Ammaross - Wednesday, March 28, 2012 - link

    "It has the fastest and best of nearly every component inside and out."

    Except the CPU is the same as in the iPad2, and by far not the "best" by any stretch of the imagination. Hey, what's the problem though? I have this nice shiny new tower, loads of RAM, bluray, SSD, and terabytes of hard drive space. Oh, don't mind that Pentium D processor, it's "good enough," or you must be using it wrong.
    Reply
  • tipoo - Wednesday, March 28, 2012 - link

    What's better that's shipping today? Higher clocked A9s, or quad core ones like the T3? Either would mean less battery life, worse thermal issues, or higher costs. Krait isn't in a shipping product yet. Tegra 3's additional cores still have dubious benefit. These operating systems don't have true multitasking, you basically have one thing running at a time plus some background services like music, and even on desktops after YEARS few applications scale well past four cores outside of the professional space. The next iPad will be out before quad core on tablets becomes useful, that I assure you of. Reply
  • zorxd - Wednesday, March 28, 2012 - link

    I'd gladly trade GPU power for CPU power.
    That GPU is power hungry too, probably more than two extra A9 cores, and the benefit is even more dubious unless you are a hardcore tablet gamer.
    Reply
  • TheJian - Wednesday, March 28, 2012 - link

    LOL, the problem is you'll have to buy that new ipad to take advantage because YOURS doesn't have those cores now. Once apps become available that utilize these cores (trust me their coming, anyone making an app today knows they'll have at least quad cpu and gpu in their phones their programming for next year, heck end of this year), the tegra 3 won't need to be thrown away to multitask. Google just has to put out the next rev of android and these tegra3's etc should become even better (I say etc because everyone else has quad coming at 28nm).

    The writing is on the wall for single/dual. The quad race on phones/tables is moving FAR faster than it did on PC's. After win8 these things will start playing a lot more nicely with our current desktops. Imagine an Intel x86 based quad (hopefully) with someone else's graphics running the same stuff as your desktop without making you cringe over the performance hit.

    I'm not quite sure how you get to Tegra3 costing more, having higher thermals (umm, ipad 3 is hot, not tegra3). The die is less than 1/2 the size of A5x. Seems they could easily slap double the gpus and come out about even with QUAD cpu too. IF NV double the gpus what would the die size be? 162mm or smaller I'd say. They should have went 1920x1200 which would have made it faster than ipad 2 no matter what game etc you ran. Unfortunately the retina screen makes it slower (which is why apple isn't pushing TEGRA ZONE quality graphics in their games for the most part...Just blade?). They could have made this comparison a no brainer if they would have went 1920x1200. I'm still waiting to see how long these last running HOT for a lot of people. I'm not a fan of roasted nuts :) Too bad they didn't put it off for 3 months and die shrink it to at least 32nm or even 40nm would have helped the heat issue, upclock the cpu a bit to make up for 2 core etc. More options to even things out. Translation everything at xmas or later will be better...Just wait if you can no matter what you want. I'm salivating over a galaxy S2 but it's just not quite powerful enough until the shrinks for s3 etc.
    Reply
  • tipoo - Wednesday, March 28, 2012 - link

    I didn't say the Tegra 3 is more expensive or has higher thermals; I said the A5X, with higher clocked cores or more cores would be, and we all know Apple likes comfortable margins. Would I like a quad core A5X? Sure. Would I pay more for it? Nope. Would I switch for reduced battery life and an even hotter chip than what Apple already made? Nope. With the retina display, the choice to put more focus on the GPU made sense, with Android tablets resolution maybe Tegra 3 makes more sense, so you can stop attacking straw man arguments I never made. There are still only a handful of apps that won't run on the first iPad and that's two years old, "only" two cores won't hold you back for a while, plus iOS devs have less variation of specs to deal with so I'm sure compatibility with this iPad will be assured for at least two or three years. If I was buying one today, which I am not, I wouldn't be worried about that.

    Heck, even the 3GS runs most apps still and gets iOS updates.
    Reply
  • pickica - Monday, April 02, 2012 - link

    The New Ipad 2 is probably gonna have a dual A15, which means dual cores will stay. Reply
  • Peter_St - Monday, April 02, 2012 - link

    The problem here is that most people have no idea what they are talking about. It was just few years ago that we all used Dual Core CPUs on our Desktop Computers and we ran way more CPU load intensive applications, and now all of a sudden some marketing bonzo from HTC and Samsung is telling me that I need Quasd Core CPU for Tablets and mobile devices, and 2+ GB of RAM,
    If you really need that hardware to run your mobile OS, then I would recommend you to fire all your OS developers, get a new crew, and start from scratch...
    Reply
  • BSMonitor - Wednesday, March 28, 2012 - link

    If you were to run the same applications a tablet is designed to, then yes, your Pentium D would actually be overkill. Reply
  • PeteH - Wednesday, March 28, 2012 - link

    The point is made in the article is that it would be impossible provide the quad GPUs (necessary to handle that display) AND quad CPUs. Given you can only do one or the other, quad GPUs is the right choice. Reply
  • zorxd - Wednesday, March 28, 2012 - link

    was it also the right choice to NOT upgrade the GPU when going from the iPhone 3GS to iPhone 4? Reply

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