The Apple iPad Review (2012)
by Vivek Gowri & Anand Lal Shimpi on March 28, 2012 3:14 PM ESTThe 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.
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ananduser - Thursday, March 29, 2012 - link
Imagination does own the fastest GPU available today. The current Tegra offerings cannot match it but nvidia goes a different way. They will start piling CUDA cores like they do on the desktop GPU front. Say you'll have in the future a better quad core from Imagination and nvidia's GPU will consist of something like 64 CUDA cores.zorxd - Thursday, March 29, 2012 - link
The problem is that you can't plug an iDevice to a computer a transfer files as you would on a USB thumb drive without iTunes. That's a major disadvantage.Also if you excluse Apple's SoC, what company makes better mobile GPU than Nvidia? The Mali 400 MP4 is good too (about on par it seems), but I wouldn't say that Tegra 3 is the bottom of the performance barrel. You seems to forget the major players of Qualcomm and TI.
darkcrayon - Thursday, March 29, 2012 - link
You can however transfer files to any number of apps via WIFI or with cloud solutions without needing iTunes though. I'd call it a "disadvantage" but not a major one.You're right the Tegra 3 isn't, I was speaking more generally considering how the Tegra 2 performed vs. the competition as well. It just seemed out of place to choose a tablet because you "love nVidia GPUs" when nVidia has not necessarily put out a spectacular GPU in any ARM SoC.
merajaan - Wednesday, March 28, 2012 - link
You guys must be commended on this review. You covered all the areas that I wanted to know about and really didn't leave one stone unturned. I applaud the depth and detail and appreciate that you didn't rush your review out for launch day like many other sites. I also appreciate the unbiased nature in which the review was written and your honest viewpoints!Anand Lal Shimpi - Thursday, March 29, 2012 - link
Thank you for the kind words :)Take care,
Anand
repoman27 - Thursday, March 29, 2012 - link
So you've gone and included a lovely example of how the AnandTech icon looks at 72 and 144 dpi... How's about including <link rel="apple-touch-icon" sizes="144x144" href="icon144.png"/> on this site so we can have a proper icon when we add an AnandTech web clip to our home screens?adrien - Thursday, March 29, 2012 - link
Still reading the review (and liking it), I'm wondering about thermals.What was the temperature of the room? Could you try with different room temperatures? (I'm wondering how it'll change when it gets 15°C hotter and how it'll fare with sun shining on it).
Is there CPU or GPU throttling when it starts heating? Do you know the SoC temp?
Thanks. :-)
Anand Lal Shimpi - Thursday, March 29, 2012 - link
The ambient temperature in the room was approximately 23C. An overheating condition will trigger an OS-wide warning, which I believe causes the system to shut down.I unfortunately don't have access to anything that could read the SoC temp.
Testing at different room temperatures is an interesting idea but one that would be difficult to accurately control without some serious equipment. I ran these tests side by side at the same time to avoid issues with a changing ambient temperature.
Take care,
Anand
adrien - Thursday, March 29, 2012 - link
Ok, thanks. With summer approaching (and very quickly in France), I guess we'll see real-world tests for the temperature in a few weeks anyway. ;-)scribby - Thursday, March 29, 2012 - link
Nice review :)I'm also wondering about thermals,
What was the brightness level when measuring the thermals on the new ipad?
Thank you.