The GPU: Intel HD 5000 (Haswell GT3)

Hire enough ex-ATIers and you’ll end up really caring about GPU performance apparently. It’s good to see that Apple still views increasing GPU performance as non-negotiable, even at the MacBook Air level. Discrete GPUs are out of the question in the MacBook Air, so all models ship with Intel’s on-die processor graphics. More importantly, all CPU choices integrate the largest GPU offering: Intel’s HD 5000 (aka GT3).

Clock speeds alone prevent the 40 EU GPU implementation from being called an Iris 5100. Given the 15W TDP limit, Intel wouldn’t be able to do the Iris name justice even if it tried.

It’s hilarious that Intel refused to give out die photos for anything other than quad-core Haswell GT2, citing competitive concerns, yet at Apple’s WWDC launch of the new MacBook Airs we got to see the first die shot of a dual-core Haswell GT3. Update: I stand corrected. Intel posted its own shot here.

From the die photo it’s very obvious that like the quad-core Haswells with Iris Pro, the dual-core GT3 parts are over half GPU. Here's the only Haswell die shot Intel PR officially released by comparison, a quad-core GT2 part that's mostly made up of CPU cores:

Similar to the CPU discussion, on the GPU front Haswell has to operate under more serious thermal limits than with Ivy Bridge. Previously the GPU could take the lion’s share of a 17W TDP with 16 EUs, now it has 15W to share with the PCH as well as the CPU and 2.5x the number of EUs to boot. As both chips are built on the same 22nm (P1270) process, power either has to go up or clocks have to come down. Intel rationally chose the latter. What you get from all of this is a much larger GPU, that can deliver similar performance at much lower frequencies. Lower frequencies require lower voltage, which in turn has a dramatic impact on power consumption.

Take the power savings you get from all of this machine width, frequency and voltage tuning and you can actually end up with a GPU that uses less power than before, while still delivering incrementally higher performance. It’s a pretty neat idea. Lower cost GPUs tend to be smaller, but here Intel is trading off die area for power - building a larger GPU so it can be lower power, instead of just being higher performance.

A Historical Look at MacBook Air GPU Performance
  2011 2012 2013
GPU Intel HD 3000 Intel HD 4000 Intel HD 5000
Manufacturing Process 32nm 22nm 22nm
Frequency 350/1150MHz 350/1050MHz 200/1000MHz
Cores 12 16 40
Peak GFLOPS 165.6 GFLOPS 268.8 GFLOPS 640 GFLOPS
TDP 17W 17W 15W

This is an even bigger deal because few of the other OEMs seem interested in paying for the larger die. Acer’s S7 uses Intel’s HD 4400 (Haswell GT2, 20 EUs), as do most of the other Haswell Ultrabooks that have been announced thus far. Armed with a 2011, 2012 and 2013 MacBook Air as well as Acer’s 2nd generation S7, we now have the ability to compare everything from Intel’s HD 3000 (Sandy Bridge) all the way up to HD 5000. It’s important to keep in mind that with the exception of HD 3000, everything here is built on the same 22nm process, and with HD 4400/5000 TDPs actually went down. In other words, post Ivy Bridge, any GPU performance gains were very hard to come by.

I’m splitting up the GPU performance data into three sections. The first is a look at some games/settings that are actually playable on processor graphics. The second is comparison data for laptop Bench. The deltas here are academic at best since nothing slower than Iris Pro can really deliver playable frame rates in our high-end notebook GPU tests. The final section focuses on synthetic performance, which should help characterize the peak theoretical gains you can expect from HD 5000.

All of the gaming tests were run under Boot Camp/Windows 8. I think it’s time to retire the HL2/Portal testing under OS X.

Playable Gaming Performance

There's a surprising number of games that are actually playable on Intel's HD 5000 in the MacBook Air. You have to be ok with the fan spinning quite loudly, but it's possible to get some ultra portable gaming in if you're up for it.

For all of these tests I stuck with 1366 x 768 so I could run comparable data on the only HD 3000 equipped MBA I had, an 11-inch model. I also threw in data from Inte's HD 4400 using the new Haswell equipped Acer S7. I'll start with GRID 2, a brand new racer, running at relatively low quality settings.

GRID 2

GRID 2 is absolutely playable on the new MacBook Air. At 43.1 fps it's 16% faster than last year's HD 4000 model. A 16% gain without increasing TDP on the same manufacturing process is pretty impressive. The gains over the 2011 MBA are substantial. GRID 2 goes from almost playable to fast enough where you can actually turn up some of the quality settings if you wanted to.

Next up is Borderlands 2. Again, a fairly modern title, but one that's really optimized for current generation consoles - making high-end processor graphics more than up for the task. While a higher TDP implementation of Haswell's integrated graphics wouldn't have an issue here, things are a little more difficult with a 15W TDP.

Super Street Fighter IV: Arcade Edition

We see a marginal improvement over the HD 4000, we're clearly thermally bound at this point. What's interesting is the HD 4400 on the S7 is actually quicker here. The difference could be cooling or how Apple decides to scale back on GPU frequency when faced with thermal limits. A quick look at Haswell's power reporting confirms that while running my Borderlands 2 test the GPU was already exceeding the PL1 (Power Limit 1) of 15W: 

 

Remember, with Sandy Bridge Intel introduced Turbo Boost 2.0 that effectively allowed for two separate power limits - one equal to the processor's TDP (PL1) and one higher than the processor's TDP (PL2) that could be hit as long as the die temperature doesn't get too high.

Despite the sub 30fps frame rate in this benchmark, Borderlands 2 was definitely playable on the HD 5000. It wasn't always smooth but if you need your single player fix, it'll suffice.

I've had a few requests to bring back our Minecraft benchmark. We ditched it from our higher end GPU reviews since it's no longer stressful enough, but for 15W TDP iGPUs it's perfect.

Minecraft

Once again we see almost a 17% increase over Intel's HD 4000. The HD 4400 comparison is also very impressive with a 12% increase in performance vs. what most MBA competitors will be using.

When I was a kid all I wanted was a console that could play arcade quality ports of Street Fighter II and Mortal Kombat II. These days, even the latest Street Fighter title has no issue playing on free graphics:

Borderlands 2

16% seems to be the magic number as that's exactly how much faster HD 5000 is compared to HD 4000. Given the lower TDP this year, that's a pretty reasonable gain. Looking at the sheer number of transistors that had to be used to get there however gives you good insight into just how hard it is to improve performance without a corresponding process node shrink.

 

CPU Performance More GPU Performance Numbers
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  • xTRICKYxx - Monday, June 24, 2013 - link

    It should be 1680x1050 Reply
  • KPOM - Thursday, June 27, 2013 - link

    Scaling is an issue. Apple won't change the resolution until it can go "Retina" and quadruple it. OS X wasn't designed to scale at 150% like Windows Metro. No sense making a halfway move when the output won't look good. That's probably why Windows 7 notebooks stayed at 1366x768 for so long. Windows 7 itself could scale but most Desktop applications can't. Reply
  • spronkey - Monday, June 24, 2013 - link

    To be honest, unless you go to *really* high res (i.e. "retina"), 1600x900 isn't really a large improvement on 1440x900, and anything higher than that becomes a little difficult to read without scaling, and ends up looking nasty. I personally think 1440x900 is a nice Mid-DPI resolution for these 13" machines. Reply
  • darwinosx - Monday, June 24, 2013 - link

    It is for pretty much everyone as unless you go all the way to retina you get tidy text and icons. Reply
  • axien86 - Monday, June 24, 2013 - link


    Not only that, but reading that Anand got the objectively better Samsung display instead of the LG display by luck of the "lottery" is one lottery that many buyers do not win.

    Secondly, Anand describes Haswell THERMAL LIMITING and how it reduces performance, but how about simple measurements of important factors like CPU, GPU, keyboard and chassis temperature under load?

    At other Mac forums, users with the new Macbook Air 2013 are finding many 3D games along with Flash/HD Youtube causes loud and irritating fan noise along with rapid dramatic rise in temperature.

    No review of a ultralight laptop is complete without a complete noise and temperature analysis.
    Reply
  • Synaesthesia - Monday, June 24, 2013 - link

    Anand's reviews are the best. The 2012 and previous models had no issues with fan noise and heat generation, nor thermal limiting. The 2013 models with Haswell have much lower power consumption and heat generation will necessarily be much lower, so I'm sure it's great too, and that thermal limiting doesn't kick in at all. Reply
  • Synaesthesia - Monday, June 24, 2013 - link

    Quoted from article: "For example, the fan was never audible on the 2013 MBA while running this test compared to running at a very noticeable volume on the 2012 Core i7 model. The same goes for temperatures. The i7 2012 model tends to run about 5% warmer along the bottom of the chassis compared to the 2013 i5." Reply
  • ddriver - Monday, June 24, 2013 - link

    They are far too biased, but then again, so are you probably, if you find them "the best" you simply are on the same direction of bias. Reply
  • darwinosx - Monday, June 24, 2013 - link

    They are not biased and you don't understand the meaning of the word. Reply
  • MonkeyPaw - Monday, June 24, 2013 - link

    Just a thought, but how about stating your concerns via constructive criticism or in the form of a question. Crying bias while continuing to visit (and therefore, support) any website just doesn't make much sense since you will be dismissed as a troll by the very people you are hoping to influence. Reply

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