The Apple iPad 2 Review
by Brian Klug, Anand Lal Shimpi & Vivek Gowri on March 19, 2011 8:01 PM ESTHDMI Mirroring
With the iPad we complained that the A4 didn't seem to include any form of digital video output, only analog outputs were supported. The A5 and the iPad 2 both rectify that as Apple now offers a $39 Apple Digital AV adapter that gives you HDMI out directly from the iPad 2.
The Digital AV adapter is a bit clunky and I believe the future of this is clearly in some form of wireless transmission, but for now it plugs directly into the dock connector. Apple had the foresight to build in a second dock connector into the dongle so you can keep your iPad 2 charged while you're mirroring it's display.
With the adapter connected HDMI mirroring just works as you'd expect it to. There's no setting you have to enable, just plug it in to your display and you're good to go. The iPad desktop is upscaled to either fit your display or it'll appear as a box in the center of your panel.
I tried the AV adapter with three different displays: a 720p Pioneer plasma, a 1080p Samung LCD and a 1920 x 1200 Dell PC monitor. With the 720p and 1080p displays I got an upscaled box in the center of the screen
On the 1920 x 1200 Dell panel I got an upscaled image that took up the total height of the screen:
In all cases Apple maintains aspect ratio.
What about functionality? Everything you see on your iPad you see via the HDMI output. If the keyboard appears on your iPad it'll appear on your HDMI display. Personally, I would like to be able to have the iOS keyboard visible on the iPad 2 but not on the image sent over HDMI. Currently it's a pure clone setup...mostly.
If you try to play video while connected to an HDMI you won't get a mirror instead you'll see the video full screen on the external display. This is true for Apple's own video player app as well as 3rd party apps like Netflix. Note that while playing a video you will only see it on the external display, not both.
Audio is passed exclusively via HDMI as well, the internal speaker is shut off.
Battery life takes a significant hit with the HDMI output enabled. While you'll see that our typical usage tests can easily hit 10 hours, over HDMI you can expect battery life closer to 8 hours. It's still not bad but definitely a larger impact than I expected.
HDMI mirroring on the LG Optimus 2X
HDMI mirroring isn't exclusive to Apple, we first saw it appear on LG's Optimus 2X and later on other Tegra 2 devices. While HDMI mirroring turns your iPad into a portable Netflix machine, it also turns it into a semi-dockable PC. The limitations I mentioned earlier still exist. There's no mouse support and multitasking is a pain compared to a full blown PC, but this is just the first step. If all you've got a light usage model and just want a more ergonomic setup at your desk, there's no reason you can't connect to a standard HDMI display and use the iPad 2 as a glorified keyboard/pointing device.
What I would like to see going forward is support for some sort of a pointing cursor within iOS while connected via HDMI - only on the external screen. The same white circle that's used in Apple's demos would work just fine here.
The question I have to ask is whether tablets based on smartphone hardware and OSes are going to become powerful enough to double as portable PCs or are desktop OSes going to become lightweight and efficient enough to run on smartphone class tablet hardware? The latter seems to be Microsoft's strategy with Windows 8. Unify the software and allow it to run on all platforms, while the former is where Apple is presently headed with the iPad. It's clear to me that convergence between desktop and ultra mobile OSes will happen at some point, I'm just unsure which side will lead the merger.
Charging
The iPad 2 uses the same 10W USB wall charger in combination with a 30-pin dock-to-USB cable as the original iPad. The benefit here is any iPad/iPod/iPhone 30-pin dock cable will charge the device (assuming your USB port properly implements the battery charging spec). On the flip side, even with the 10W wall charger you're looking at ~ 4.5 hours to get a full charge on the device. Charging via the PC is even slower - it'll progress at roughly half the rate as you can get via the wall charger. Note that like the original iPad you'll need a USB port that implements the battery charging specification in order to charge from your PC/Mac. All of the new Mac notebooks seem to implement this spec (2010 MacBook Pro, 2011 MacBook Pro, 2010 MacBook Air) and had no problems charging the iPad 2.
The Xoom by comparison avoids this problem. The USB port on the Xoom is only used for syncing, there's a separate dedicated port for the wall charger. As a result you'll get a full charge on the Xoom in 3 hours.
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Azethoth - Monday, March 21, 2011 - link
No! 22 seconds is not fast enough. That is 20 seconds wasted each time you do that in a day.benonemusic - Monday, March 21, 2011 - link
Excellent writing and content as usual. As a longtime reader (this is my first post) with an editorial eye, I had a suggestion for future articles such as this with multiple authors but in which the main review is written in the first person singular. It was slightly disorienting to see three authors (Brian, Anand, Vivek) but then much of the article written with "I" (presumably Anand), you might want to avoid listing all three authors as "ands" in that case. One idea would be make the first author the one who is speaking in the first person voice (presumably Anand in the case) and the other two to be listed as "with." If the review is written as "we" then having all three of the authors as "ands" makes sense. There are multiple solutions. You can simply keep the "ands" and then indicate who the "I" is in the first instance. You could obviously say "one of us" in the first instance and indicate "Anand" in parentheses. And so on. Sorry for going on this long, but I'm big on bylines. Keep up the great work with the articles!embeddedGPU - Monday, March 21, 2011 - link
Can you clarify the floating point precision for your GPU GFLOPS figures ? You mention 20-/32-bit for nVidia, but I think the SGX is only 16-bit precision. If so, it's not a totally fair comparison...wellortech - Monday, March 21, 2011 - link
"If you fell in love with the original iPad, the iPad 2 is a significant upgrade."Really? Since when is thinner and a crappy camera a significant upgrade?
mcnabney - Monday, March 21, 2011 - link
You guys missed noticing something when documenting the huge step forward with the iPad2 GPU power.We now have iOS fragmentation.
The entire iPad1 generation was obsoleted in the graphics department. Now developers have to choose between writing for the iPad1 or iPad2. There is far too large of a gulf between the two platforms. To benefit from the GPU advancement, the massive installed base of the iPad1 will have to be written-off.
kmmatney - Monday, March 21, 2011 - link
I don't think this is true. First, we are only talking about 2 models, and second, they can just enable more graphics features for iPad 2. I can see where some truly advanced games might only be written for the iPad 2 in the future, but there is really no way to avoid that.Azethoth - Monday, March 21, 2011 - link
There always was and always will be iOS fragmentation since the 2nd iDevice shipped.As for what it means in a practical sense: check out Infinity Blade on multiple devices (iPhone and iPad). See, not a big deal, content providers are used to scaling artwork and design.
Furthermore, iOS will suffer less from this than Android (fewer device specs). It is one of the aspects of the competition at this form factor that makes me think that Apple will do better than it does at the PC level. (Not that Apple PC profits are not insanely good for their industry: over 50% of entire industry by some accounting).
araczynski - Monday, March 21, 2011 - link
if you're after a notebook/pc replacement, you're kidding yourself with any tablet.if you're after a gaming device, you're golden :) especially if you think gaming on phone sized screens (this includes psp/ds/etc) is plain stupid.
mine is filled to the brim with games, no room for audio/video/etc, just pure games.
i love it, my daughter loves it, even my technophobe wife loves it.
its for entertainment, nothing more.
Azethoth - Monday, March 21, 2011 - link
It is for more than entertainment:You can amuse your cat with it as well!
coolio68 - Monday, March 21, 2011 - link
Great review Anand,regarding this comment though:'The real competition for the SGX 543MP2 will be NVIDIA's Kal-El. That part is expected to ship on time and will feature a boost in core count: from 8 to 12. The ratio of pixel to vertex shader cores is not known at this point but I'm guessing it won't be balanced anymore. NVIDIA is promising 3x the GPU performance out of Kal-El so I suspect that we'll see an increase in throughput per core.'
Worth bearing in mind a couple of things:
SGX 543MP can already incorporate 2 to 16 cores
The even higher performance SGX 554MP cores have also been announced in December
Power VR Series 6 (Rogue), the next-generation, can scale from 210 GFLOPS to 8 TFLOPS , and is already licensed by the usual suspects.
The A9600 chip announced by ST-E at MWC ,containing Rogue, is sampling in H2 2011.
Nvidia are gonna have their work cut out methinks, but the competition is great for the industry and consumers.