WiFi & GPS

The WiFi stack gets an update with the new iPad courtesy of Broadcom's 65nm BCM4330, compared to the BCM4329 used in the previous two iPads. Both 2.4GHz and 5GHz operation are supported, although as I mentioned earlier the carrier-dependent personal hotspot is only available over 2.4GHz.

As with most smartphone/tablet designs the BCM4330 only supports a single spatial stream, for a maximum link speed of 72Mbps. Similar to the iPad 2, Apple hides the WiFi antenna behind the speaker grille at the bottom of the tablet. The cellular antennas (there are now two) are at the top of the tablet, behind the plastic RF window.

WiFi Performance Comparison
Distance from AP 3 feet 20 feet (Different Room) 50 feet (Different Room/Floor) 100 feet (Different Room)
ASUS TF Prime (2.4GHz) 26.9 Mbps 9.85 Mbps 13.5 Mbps 2.20 Mbps
Apple iPad 2 (2.4GHz) 35.1 Mbps 29.9 Mbps 26.9 Mbps 10.6 Mbps
Apple iPad 3 (2.4GHz) 35.1 Mbps 29.9 Mbps 27.9 Mbps 9.98 Mbps
Apple iPad 2 (5GHz) 36.7 Mbps 36.7 Mbps 36.7 Mbps 11.9 Mbps
Apple iPad 3 (5GHz) 36.7 Mbps 36.7 Mbps 36.7 Mbps 11.7 Mbps

With a similar WiFi stack and similar antenna placement, it's no surprise that I noticed very similar WiFi performance to the iPad 2.

The same goes for GPS performance between the new iPad and the iPad 2. Both devices were able to lock and track me driving around in a car with comparable accuracy from what I could tell.

Airplay Support with the new Apple TV

When paired with a second or third generation Apple TV, the iPad supports wireless display mirroring or content streaming to the iPad via AirPlay. In other words, if you have an Apple TV hooked up to your HDTV, you can use your HDTV as a large, mirrored, secondary display for your iPad—wirelessly. The only requirement is that you have a 2nd or 3rd generation Apple TV and that it's on the same network as your iPad. With those requirements met, enabling AirPlay mirroring is simple—just bring up the iOS task switcher, swipe left to right until you see the brightness/playback controls and tap the AirPlay icon.

Mirroring gives you exactly what you'd expect—a complete mirror of everything you see on the local iPad screen. All sounds are also sent over and come out via your TV's speakers—the local speaker remains silent.

The frame rate isn't as high on the remote display, but there's virtually no impact to the performance of the iPad itself. There's noticeable latency of course since the display output is transcoded as a video, sent over WiFi to the Apple TV, decoded and displayed on your TV via HDMI. I measured the AirPlay latency at ms, which is reasonable for browsing the web but too high for any real-time games. If you want to use the iPad to drive your HDTV for gaming you'll need to buy the optional HDMI output dongle.

While AirPlay mirroring on the iPad works at 720p, if you're playing a 1080p movie on the new iPad and you have a 3rd generation Apple TV, the video is also displayed in 1080p rather than downscaled to 720p.

Video playback is an interesting use case for AirPlay and the iPad. If you don't have mirroring enabled, you can actually start playing a movie on the iPad, have it stream to your TV via the Apple TV, and go about using your iPad as if nothing else was happening. Most apps will allow you to stream video in the background without interrupting, however some games (e.g. GTA 3, Infinity Blade 2) and some apps (e.g. iMovie) will insist on streaming their UI to your Apple TV instead.

Although iOS and the iPad don't do a great job of promoting multi-user experiences, using AirPlay to push video to a TV wirelessly is an exception. If you frequently load your iPad up with movies you can use it to keep others entertained while you either get work done or just goof around on your iPad at the same time. It's a great fit for families where people want to do two different things. If you do put a lot of movies on your iPhone/iPad, the 3rd generation Apple TV is probably a must buy for this reason alone.

Gaming Conclusion & Controller Support: An Android Advantage What's Next: 6th gen iPhone, Haswell & Windows 8
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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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