Introducing the Radeon HD 6990M

The battle for graphics supremacy has been going for well over a decade now, with several casualties of war along the way (RIP 3dfx, Trident, S3, etc.). The primary competitors continue to be NVIDIA and AMD, and with NVIDIA having recently reclaimed the single GPU performance crown on both desktops and laptops with their GTX 580/580M, it’s time for AMD to respond. We’re not presenting any details for next generation desktop parts at present, and in fact the HD 6990M isn’t much of a surprise, but either way AMD is ready to release the details of their next mobile GPU.

We recently covered the mobile GPU landscape, with a discussion of the various performance levels and price segments. The price/performance ratio is actually pretty similar between AMD and NVIDIA mobile GPUs (at least until we hit the top-tier models), and both have a decent number of design wins with notebook ODMs. The current mobile performance crown goes to NVIDIA’s recently launched GTX 580M, but along with the performance crown comes a hefty price and performance bill that needs to be paid. AMD’s top mobile part prior to today’s announcement is the 6970M, which is basically a lower clocked version of the desktop Barts core with some of the Stream processors disabled (essentially a mobile HD 6850). Our testing has shown the 6970M to offer just slightly less performance on average compared to the GTX 485M, but interestingly enough NVIDIA managed to use less power in low/idle loads than AMD. Of course, even the HD 6970M is a trimmed Barts core, and there’s still the desktop 6950/6970 Cayman core that has yet to see a mobile variant, which brings us to today’s announcement.

If you were hoping to see a truly crazy mobile GPU running off the Cayman architecture, we’re unfortunately not getting that. Unlike the desktop 6990, we’re also not talking about a dual-GPU in a single card solution. Instead, the HD 6990M will be a full Barts core, with all 1120 shaders enabled. (The closest desktop equivalent is the HD 6870, which comes clocked at 900MHz, 25% higher than the 6990M.) Besides the now-standard DX11 support that AMD has been shipping since the first HD 5000 parts, 6990M also includes HD3D (stereoscopic 3D), OpenCL 1.1, and DirectCompute 11 support. AMD groups many of the features under the umbrella of "AMD App Acceleration", though there's technically nothing new here as all the 5000M and 6000M DX11 parts use the same drivers and support nearly the same features.

Looking at the mobile parts, the shader count gives the 6990M an immediate 17% boost in performance relative to the 6970M, and with a slightly higher cores clock as well (715MHz on the 6990M vs. 680MHz on the 6970M), we’re looking at up to 23% higher performance than the 6970M. Both the 6970M and 6990M continue to feature 3600MHz GDDR5 memory, although the 6990M comes with 2GB instead of 1GB. AMD also enabled OverDrive up to 740MHz for the 6990M if you want to try some quick overclocking. Here’s how performance between the AMD parts stacks up, according to AMD’s internal testing (using a desktop 3.4GHz Phenom II CPU):

On the other side of the fence, NVIDIA’s GTX 580M has the same number of CUDA cores as the GTX 485M (384 cores), but with an 8% increase in clock speed. (The closets desktop equivalent is the GTX 560 Ti, which comes clocked 37% higher than the 580M.) Our earlier testing of the 485M and 6970M resulted in nearly identical average gaming performance across eight tested games, with both sides winning a few titles. In theory, then, HD 6990M should retake the mobile performance crown given the greater increase in compute and clock speeds relative to the second-tier parts. The following slide uses simulated performance (e.g. a downclocked desktop GTX 560 Ti GPU running at mobile speeds and with only 1GB GDDR5, again with a 3.4GHz Phenom II CPU), so take these results with a grain of salt:

Both the AMD and NVIDIA parts should be plenty fast for 1080p mobile gaming, so the real question is more likely to be who offers the best overall value. Sure, value in a gaming notebook is something of an oxymoron, but unless you absolutely need CUDA/PhysX support on the NVIDIA side or are looking at Bitcoin mining on the AMD side, performance is going to be close enough that pricing will sway the vote. Availability of the 6990M starts today, with the Alienware M18x coming in both single and CrossFire configurations. Clevo will also support the HD 6990M in their P170HM, P150HM, and X7200 notebooks, which means we’ll see whitebooks from the usual suspects like Eurocom, AVADirect, and others. Here's AMD's complete high-end mobile GPU lineup:

AMD Mobility Radeon 6800M and 6900M Lineup
  Radeon HD 6990M Radeon HD 6970M Radeon HD 6950M Radeon HD 6870M Radeon HD 6850M Radeon HD 6830M
Model Name (Code Name) Blackcomb Pro (Barts) Blackcomb Pro (Barts) Blackcomb Pro (Barts) Granville Pro (Juniper) Granville Pro (Juniper) Granville Pro (Juniper)
Stream Processors 1120 960 960 800 800 800
Texture Units 56 48 48 40 40 40
ROPs 32 32 32 16 16 16
Core Clock 715MHz 680MHz 580MHz 675MHz 625MHz 575MHz
Memory Clock 900MHz (3.6GHz) GDDR5 900MHz (3.6GHz) GDDR5 900MHz (3.6GHz) GDDR5 1000MHz (4.0GHz) GDDR5 1000MHz (4.0GHz) GDDR5 900MHz (3.6GHz) GDDR5
Memory Bus Width 256-bit 256-bit 256-bit 128-bit 128-bit 128-bit
Memory Bandwidth 115.2GB/s 115.2GB/s 115.2GB/s 64GB/s 64GB/s 57.6GB/s

As we've noted in the past, the 6000M consists of parts from both the Evergreen and Northern Islands series of graphics chips. For many users, the difference between the two isn't all that important, but Northern Islands does upgrade the video engine to UVD3 where Evergreen is UVD2.2. Also worth remembering is that the 6800M parts are really just renamed 5800M parts with slightly altered clocks in some cases, so they're not as attractive as the 6900M parts. Finally, the 6800M parts can come with either GDDR5 or DDR3, the latter being significantly slower and thus less desirable. Our table only uses the specs from GDDR5 variants, so if you're shopping for a 6800M make sure you get a GDDR5 model.

Outside of their newest mobile GPU, we also asked AMD about the current state of their switchable graphics on Intel platforms. AMD says they should have some partners releasing laptops with application based switching (e.g. similar to NVIDIA’s Optimus), but that will likely be with lower performance GPUs. In contrast, NVIDIA is touting Optimus support on certain GTX 580M configurations, though as always it’s up to the notebook vendors to utilize the feature. We haven’t had a chance to get hands on time with any form of AMD switchable graphics for some time, so the jury is still out. We hope to have an appropriate laptop for testing in the not-too-distant future, at which time we’ll be able to provide a better answer on which solution is the overall winner.

As for the question of who actually takes home the mobile gaming performance crown, we hope to have both GTX 580M and HD 6990M notebooks for testing in the coming weeks. On paper and using our previous 6970M and GTX 485M results, it looks like the 6990M should come out on top, but with various driver updates in the past several months we’re not ready to declare an official winner. If you’re looking for more than a few slides and potentially biased game selections, stay tuned: we’ll provide our usual in-depth look at real-world performance as soon as we can get hardware into our labs. Our money is still going to be on whoever can come in at a lower price point, and if recent history is any indication, that will likely be AMD with the 6990M. Update: Alienware now has both the GTX 580M SLI and HD 6990M CrossFire configurations available on their web site; at present, the SLI setup costs $700 more than the CrossFire configuration, which makes the 6990 an easy recommendation.

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  • neothe0ne - Tuesday, July 12, 2011 - link

    considering that current muxless Radeon 6000M cards for Sandy Bridge laptops from Dell, HP, and Lenovo among others, are unable to use the Radeon to perform any OpenGL work. At all.
  • kurosawa79 - Tuesday, July 12, 2011 - link

    Jarred - notice you mention dynamic switching for AMD's mobile GPUs. I'd like to you give you an idea of how that works and should you want to review the current implementation you should grab a HP DV6-6100 Sandybridge series laptop to test for yourself.

    The one major issue right now is that there is absolutely no OpenGL support on these muxless GPUs from AMD. Not sure why they'd make such a decision but with no manual switching on these setup, us 6100 series owners cannot force the dGPU to switch on to accelerate OpenGL apps. AMD thinks that utilizing the Intel IGP solutions on-board should suffice for OpenGL. I'm not sure which planet they are on. Any CAD program will run horribly; Adobe products will run horribly; any OpenGL games will run horribly on the IGP. As I say, pls review AMD's Switchable Graphics and test it for yourself to see how crippled OpenGL is on these machines.

    Problem is AMD wont acknowledge the problems and nor will HP. Perhaps when you talk to AMD you can highlight this failure to them, i.e. sending a product to market on a mass consumer notebook that's half baked.

    The problem is very well documented on these pages for HP DV6/7 series laptops with the muxless 6 series AMD cards:

    And even on HP's sales page for the DV6, the problem is highlighted by many users and their ratings have plummeted - yet no response. I guess noone cares that AMD Switchable Graphics is a joke at AMD or HP:

    And guess what, its not just a problem with HP laptops, but an industry wide problem as evidenced by these laptops complaints from Dell and Lenovo customers.


  • khimera2000 - Tuesday, July 12, 2011 - link

    There are issues with Intel and Nvidia optimus switching technology. It does not work right, and there are some programs that refuse to switch. The odd thing is Dell hasn't given out a fix. the last video driver update was a loong time ago. I still cant watch flash in fool screen...

    On that note I would say the common denominator is whats boning us over. If dynamic switching was ever to work right the company would have to own both the Integrated video card, and at least the connection to the discreet card.

    Without this there is no way to guarantee compatibility, not to mention that AMD might not even have an urge to fix a issue with its biggest rival. I would see them fixing the issues there having with Fusion's dual GPU set up first.
  • kurosawa79 - Tuesday, July 12, 2011 - link

    Well that's pretty hopeless for the thousands of laptop owners with 6 series switching problems. HP have plenty of RMA's to mull over as they decide on their GPU suppliers for the next revision of their higher -end laptops. You say Optimus doesnt work but at least OpenGL works on it fine.
  • Althernai - Tuesday, July 12, 2011 - link

    Optimus has a few glitches, but its problems are nowhere near the scope of AMD's switchable graphics where an entire class of applications is simply not supported. And incidentally, this has little to do with Intel; AMD's own APUs are advertised to have the same problem:

    "With AMD Dynamic Switchable Graphics technology, full enablement of all discrete graphics video and display features may not be supported on all systems (e.g. OpenGL applications will run on the integrated GPU or the APU as the case may be)."
  • JarredWalton - Tuesday, July 12, 2011 - link

    khimera, I'd be curious to know what specific programs you have that you can't get to switch over to the dGPU. Also, have you tried manually specifying the GPU to use? I have not noticed many problems with Optimus, but if you can give me additional items to test next time I review an Optimus enabled laptop, I'll happily do so.

    Right now, I'd say you have some driver or system specific glitch, as I can tell you that full screen Flash video is something I have used on dozens of Optimus laptops without a problem. What laptop are you using, and what driver version? Anyway, Dell is part of NVIDIA's Verde driver program (all OEMs are participating now, AFAIK), so you can just get the latest 275.33 driver and it should install and work:
  • sidneyleejohnson - Tuesday, July 12, 2011 - link

    I wonder what check notebook is doing wrong in simulating the 6990M?
  • JarredWalton - Tuesday, July 12, 2011 - link

    They list a core speed of 680 and a shader speed of 715, but that's incorrect: both should be 715. Assuming they have the right RAM clocks, the only real issue with simulating performance is the platform. A desktop GPU running in a desktop simply isn't the same as a notebook GPU running on a notebook platform, though it's probably close enough.
  • sidneyleejohnson - Tuesday, July 12, 2011 - link

    check notebook seems to have updated their numbers. They look much more in line with the amd data now.
  • The0ne - Tuesday, July 12, 2011 - link

    Definitely waiting on the 580M and 6990M reviews from you, since I won't be paying for either one for my M17x :D If the 6990M is fast enough it'll be a consideration for another gaming laptop.

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