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.

Comments Locked


View All Comments

  • HDx264 - Tuesday, July 12, 2011 - link

    Is it possible to swap this in place of the 6970m in the 2011 Core i7 iMac?
  • Kaboose - Tuesday, July 12, 2011 - link

    I would be worried about power and thermals.
  • khimera2000 - Tuesday, July 12, 2011 - link

    I doubt this would be an option. They would need to use an MXM slot (i think that's what its called.) and that takes space that they don't really have in there preferred form factor.

    A lot of companies solder there video cards onto there boards, if its not soldered on, and your lucky enough to find a standard mxm slot then you would have to make sure that you have the right class of MXM, which i beleave there's 4 but again not positive. Once you find out you have the slot you will then have to find the card which is always more expensive then what you can get through a vendor built option. after that you would have to deal with all the small issues that love to pop up with the change, like fans not working right, thermals being off, loss of battery life, termination of your warranty, you get the idea.

    so, the short is ya... it is possible, but is it worth it to do? I would say hell no. No guaranteeing that it will work, no way of knowing if it will melt something in your system, and no way to know if the copper from your old video card is working right on your new one.
  • Kristian Vättö - Tuesday, July 12, 2011 - link

    iMacs use MXM slots. The bigger issue with iMacs and Macs in general is that they use different ROM (designed for EFI) so PC cards won't work out-of-the-box.
  • ramvoo - Tuesday, July 12, 2011 - link

    Just a Question here. Doesn't the Mac bios have to support the 6990M??
  • quiksilvr - Tuesday, July 12, 2011 - link

    Not necessarily. It's up to the video card makers to give supporting drivers.
  • sirsoffrito - Tuesday, July 12, 2011 - link

    Sure, AMD would have that option of making drivers for Mac OS X, however, doesn't Apple usually handle that stuff? Anything AMD does would be aftermarket. Plus, why put the time and money into development when the user base is likely small? I wouldn't expect Apple to do it either. They don't like you running unsupported hardware. It's in the EULA.
  • Stuka87 - Tuesday, July 12, 2011 - link

    AMD handles the drivers for MacOS X OEM cards, although they work closely with Apple on them.

    Although I should note that I have not worked directly with ATI/AMD for a few years now. So its possible this has changed.

    As for the EFI/BIOS thing, most shipping laptops these days use EFI. I know my Precision M4600 for work does, and I believe HP is also using EFI for all their laptops.
  • Penti - Tuesday, July 12, 2011 - link

    Yes, but that doesn't mean the discrete graphics accelerators are using a compatible firmware. EFI on Windows PCs handle ordinary VGA BIOS just fine. So also does other platforms like PowerPC for the most time. So they do need to release a EFI firmware for the mac, which might or might not include a firmware update for the mac internal own EFI-firmware. Remember on mobile components display etc is attached directly to the GPU through LVDS or eDP interfaces. So it need to output the correct settings for the screen and such. Needs to be initialized by the Macs EFI firmware for you to get a picture.

    There have been third party graphics on the mac platform by nVidia that hasn't been sold as an option but available retail just as the drivers from PNY/Nvidia directly, not via Apple software updates. Also CUDA-support is fully third party, as well as elementals support. Doesn't mean they have fully control of or full support over the graphics stack however, but they do over the drivers. However nvidia's workstation graphic drivers have been horrible for OS X. But it's fully possible to do a release outside of Apple's channels for the Mac Pro, companies like Lacie even support USB3 which isn't yet a feature of the OS, on Macs. However it wouldn't be as easy and would not practically be doable to release a MXM-card for the iMacs. They could design a compatible PCB-card and EFI-firmware but without Apple support who would install and support it? nVidia wouldn't be conducting such homebrew DIY activities. MXM doesn't even work like that for ordinary PCs built by the same manufacturer. Look at hobbyists like to see how a pain it is on ordinary Clevo, Compal, Asus and Quanta etc built laptops it really is. Many different types, heatsink problems, fan problems, power problems, driver problems as many cards has their own OEM drivers, many bios incompatibilities etc.

    Neither do I really see the attraction on spending €450 for HD6970M on a laptop that costs €1000-1500 itself. For an unsupported solution you need to modify the cooling, possibly modify the graphics drives to install and so on. It's imply not really meant to be replaceable and every manufacturer pretty much has their own parts. You can get a complete laptop with HD6970M for €1300 (1500 USD) any way for that matters. If you stay away from the Alienwares it doesn't cost that much not to merit a complete upgrade and replacement of the machine if you really need the graphics.

    Size, power, connections/ports and cooling need to be standardized more as well as VBIOS features for MXM to be really upgradeable. It simply won't happen. Kinda bad for the iMac though. Will only work with Apple spare parts. Which can sometimes be an upgrade like from 5670M to 5750M. Or 6970M for your 2011 27" iMac, with 6770M originally. But it would be cheaper to buy it with 6970M from the beginning. When it becomes dated it becomes dated.
  • dragonsqrrl - Tuesday, July 12, 2011 - link

    "Besides the now-standard DX11 support that AMD has been shipping since the first HD 5000 parts, 6990M also includes with HD3D (stereoscopic 3D) and OpenCL 4.1 support."

    Don't you mean OpenGL 4.1?

Log in

Don't have an account? Sign up now