Apple's iPad - The AnandTech Review
by Anand Lal Shimpi, Brian Klug & Vivek Gowri on April 7, 2010 9:39 PM EST- Posted in
- Smartphones
- Mac
- Apple
- iPad
- Mobile
The Silicon - Meet the A4
Before the first iPad was ever unboxed, photos had already leaked of its dissection. Admittedly, I was relieved as it meant I didn’t have to risk destroying mine to figure out how to get inside the chassis. Why was getting inside Apple’s new tablet such a big deal? Because it’s using Apple’s brand new SoC.
It’s called the A4 because it is the 4th generation SoC designed by Apple. That would make the silicon in the iPhone 3GS the A3, the A2 would be what’s in the iPhone and perhaps A1 was an older iPod chip? Either way, the A4 was the first we heard of Apple’s naming system.
For months leading up to the iPad announcement everyone assumed that Apple’s acquisition of PA Semi meant that the company was going to ditch Samsung and come forth with its own killer SoC. Would it be an out-of-order Cortex A9 design? Or would it be truly custom, similar to what Marvell or Qualcomm have done with their Armada and Snapdragon lines?
As with everything involving the iPad, rumors of the device’s silicon ran rampant. But the idea of Apple doing their own microprocessor architecture for the iPad was disappointing to me. To understand why, we have to look at Apple COO, Tim Cook’s recent statements on why Apple has been successful:
“We are the most focused company that I know of or have read of or have any knowledge of. We say no to good ideas every day. We say no to great ideas in order to keep the amount of things we focus on very small in number so that we can put enormous energy behind the ones we do choose.”
Tim was talking about products there, but I believe his statement is applicable to the A4 as well. Apple is not a microprocessor company, nor does Apple want to toss its hat in with the likes of Intel, NVIDIA, Qualcomm and TI as an SoC maker. History has shown us that the only way to be a successful microprocessor company is to be able to subsidize the high cost of designing a powerful architecture over an extremely large install base. That’s why x86 survived, and it’s why the ARM business model works.
Designing high performance SoCs just for use in the iPad and iPhone just doesn’t make sense. In the short term, perhaps, but in the long run it would mean that Apple would have to grow the microprocessor side of its business considerably. That means tons of engineers, more resources that aren’t product focused, and honestly re-inventing the wheel a lot.
The fact that the A4 appears to be little more than a 45nm, 1GHz Cortex A8 paired with a PowerVR SGX GPU tells me that Apple isn’t off its rocker. I don’t exactly know what Apple is doing with all of these CPU and GPU engineers in house, but licensing tech from the companies who have experience in building the architectures is still on the menu.
The A4 is a typical smartphone SoC. It’s got CPU, GPU and DRAM all on a single package. It also appears to be the same size as your typical smartphone SoC, meaning there’s a good chance we’ll see this thing in the next iPhone. The A4 has 256MB of on-package DRAM, just like the current iPhone 3GS SoC. Remember that memory is used for the OS, all applications as well as video memory. It’s a testament to just how lightweight the iPhone OS is.
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zodiacfml - Thursday, April 8, 2010 - link
Another quality review, useful as trying the device myself.I'm not buying Apple products but you touched on features that it should have.
One is the ability to stand on its own to function as a picture frame, movie screen, and reader while someone is eating or something else.
Support for mouse device and keyboard when it can already stand on its own.
Support for uploading media such as video and photos from either flash cards or directly from cameras. it is such a good device to use with cameras.
one more thing, they could get the intel atom cpu once it gets to a smaller process to improve size and energy efficiency.
Spivonious - Thursday, April 8, 2010 - link
Anand, I love your writing and have read the site since the GeoCities days, but please learn the difference between "lay" and "lie".crimson117 - Thursday, April 8, 2010 - link
My biggest pet peeve with the iPhone UI is the lack of an indicator for when an app is visible but busy processing something and not currently accessible.The default Notepad app on the iPhone 3G is a great example - as soon as you tap the icon, the yellow Notepad interface pops right up. However, it actually takes several seconds to finish loading until you can tap to edit a note or tap the (+) sign to start a new note. There's no indicator at all of when the loading is complete - you have to keep tapping periodically until it finally works.
The same is true for resizing a web page using multitouch - there's no indicator that your input has been received but it's going to take a few moments to make it happen.
In Windows 7 when an app is "thinking" and thus you can't interact with it, your mouse pointer becomes a a little circle (aka an hourglass). If an app is ever extremely busy thinking, the app may even gray out to indicate that even Windows can't get it to respond at that time.
The iPhone's lack of this feature just smells of Apple trying to make the device appear on the surface to be more responsive than it really is. Perhaps you'll question whether you tapped correctly, and won't realize that the device is just slower than you expect it to be.
archcommus - Thursday, April 8, 2010 - link
This article, like your others, despite being 22 (!) pages long, is a quick, refreshing read. It feels more like you're talking about your experiences and less like you're writing an article as a journalist (which can make some other long reviews a little boring). Also seemed pretty unbiased and highlighted the good and bad. Another solid article, thanks.Mumrik - Thursday, April 8, 2010 - link
Hehe, this isn't a big deal - it's just amusing:"Although there's no mute button, holding the volume down rocker for 2 seconds mutes the device instantly."
Nope. Sounds to me like it takes about two seconds to mute the device :)
AstroGuardian - Thursday, April 8, 2010 - link
Good one. My thought exactly...leospagnol - Thursday, April 8, 2010 - link
I'm planning to buy one of them when I travel to US next month. THe Eee 1001P is $ 280.00, and the iPad $499.00 at least. I usually read more than I write during classes and I have wifi available during class. I'll probably buy the Eee, but wich do you think suits this task best?Mumrik - Thursday, April 8, 2010 - link
Imagine the iPad lying flat on your desk and then imagine the position you would have to sit in all lecture long if you wanted to be able to write.Then imagine how much of the time you'd have to look down at what you were writing because you didn't have the physical response of a keyboard to make touch typing easy.
Now imagine not being able to multitask.
It would not be a difficult choice for me - Anand said it himself - the iPad is generally not a laptop substitute.
videogames101 - Thursday, April 8, 2010 - link
I love the M3, great episode there.Good to know I can watch it on the iPad, lol.
AstroGuardian - Thursday, April 8, 2010 - link
As far as i remember, this was not mentioned in the review (the overheating problem):http://www.dailytech.com/article.aspx?newsid=18075
Personally i don't think it's worth commenting. It's not just the iPad but all other electronic devices will overheat when put out on the sun. And i wouldn't call it overheating but more like misuse.