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The AMD Radeon HD 6990, otherwise known as Antilles, is a card we have been expecting for some time now. In what’s become a normal AMD fashion, when they first introduced the Radeon HD 6800 series back in October, they also provided a rough timeline for the rest of the high-end members of the family. Barts would be followed by Cayman (6950/6970), which would be followed by the dual-GPU Antilles (6990).

AMD’s original launch schedule at the time was to have the whole stack out the door by the end of 2010 – Antilles would be the last product, likely to catch Christmas before it was too late. What ended up happening however is that Cayman didn’t make it out until the middle of December, which put those original plans on ice. So we ended up closing the year with the 6800 series and the single-GPU members of the 6900 series, but AMD did not launch a replacement for their flagship dual-GPU card, leaving AMD’s product stack in an odd place where their top card was a 5000 series card compared to the 6000 series occupying everything else.

So while we’ve had to wait longer than we anticipated for Antilles/6990, the wait has finally come to an end. Today AMD is launching their new flagship card, retiring the now venerable 5970 and replacing it with a new dual-GPU monster powered by AMD’s recently introduced VLIW4 design. Manufactured on the same 40nm process as the GPUs in the 5970, AMD has had to go to some interesting lengths to improve performance here. And as we’ll see, it’s going to be a doozy in more ways than one.

  AMD Radeon HD 6990 AMD Radeon HD 6970 AMD Radeon HD 6950 AMD Radeon HD 5970
Stream Processors 2x1536 1536 1408 2x1600
Texture Units 2x96 96 88 2x80
ROPs 2x32 32 32 2x32
Core Clock 830MHz 880MHz 800MHz 725MHz
Memory Clock 1.25GHz (5.0GHz data rate) GDDR5 1.375GHz (5.5GHz data rate) GDDR5 1.25GHz (5.0GHz data rate) GDDR5 1.GHz (4GHz data rate) GDDR5
Memory Bus Width 2x 256-bit 256-bit 256-bit 2x256-bit
Frame Buffer 2x2GB 2GB 2GB 2x1GB
FP64 1/4 1/4 1/4 1/5
Transistor Count 2x 2.64B 2.64B 2.64B 2x2.15B
Manufacturing Process TSMC 40nm TSMC 40nm TSMC 40nm TSMC 40nm
Price Point $699 $349 $259 N/A

For the Radeon HD 5970, AMD found themselves in an interesting position: with the 5000 series launching roughly 6 months ahead of NVIDIA’s 400 series of GPUs, they already had a lead in getting products out the door. But furthermore NVIDIA never completely responded to the 5970, foregoing dual-GPU entirely with the 400 series. The 5970 was undisputed king of video cards – no single card was more powerful. Thus given a lack of direct competition, how AMD can follow up on the 5970 is a matter of great interest.

But before we get too far ahead of ourselves, let’s start with the basics. The Radeon HD 6990 is AMD’s new flagship card, based on a pair of Cayman (VLIW4) GPUs mounted on a single PCB. AMD has clocked the GPU at 830MHz and the GDDR5 memory at 1250MHz (5GHz data rate). The card comes with 4GB of RAM, which due to the internal CrossFire setup of the card reduces the effective RAM capacity to 2GB, the same as AMD’s existing 6900 cards.

Starting with the 5970, TDP limits and the laws of physics began limiting what AMD could do with a dual-GPU card; unlike the 4870X2, the 5970 wasn’t clocked quite high enough to match a pair of 5870s. The delta between the 5970 and the 5870 came down to the 5970 being 125MHz slower on the core and 200MHz (800Mhz data rate) slower for its RAM. In practice this reduced 5970 performance to near-5850CF levels. For the 6990 this gap still exists, but it’s much smaller this time. At 830MHz the 6990 is only 50MHz (5.5%) slower than the 6970, while the 5GHz memory takes a bigger hit as it’s 500MHz (9%) slower than the 6970. As a result at stock settings the 6990 is closer to being a dual-GPU 6970 than the 5970 was a dual-GPU 5870; there is one exception we will see however. Meanwhile the 6990’s GPUs are fully enabled, so all 1536 SPs and 32 ROPs per GPU are available, making the only difference between the 6990 and 6970 the clockspeeds.

Compared to the 5970, the official idle TDP is down some thanks to Cayman’s better power management, leading to an idle TDP of 37W. Meanwhile under load we find our first doozy: the card’s TDP at default clocks is 375W (this is not a typo), and like the 5970 AMD has built it to take even more. Whereas the 5970 stayed within PCI-Express specifications at default clocks, the 6990 makes no attempt to do so, and as such at 375W is the most power hungry card to date.

AMD will be launching the 6990 at $699. Officially this is $100 more expensive than the 5970 at its launch, however the 5970 was virtually never available at this price until very late in the card’s lifetime. $700 does end up being much closer to both the 5970’s historical price and its price relative to AMD’s top single-GPU part (5870), which was $700 and approximately twice the cost respectively. With a more stable supply of GPUs and stronger pressure from NVIDIA we’d expect prices to stick closer to their MSRP this time around, but at the top there’s not a lot of pressure to keep prices from rising. Meanwhile AMD has not provided any hard numbers for availability, but $700 cards are not high volume products. We’d expect availability to be a non-issue.

With the launch of the 6990 AMD’s high-end product stack is fully fleshed out. At the top will be the 6990, followed by the 6970, the 6950 2GB, and the 6950 1GB. The astute among you will notice that the average price of the 6970 is less than half that of the 6990, and as a result a 6970 CrossFire setup is cheaper than the 6990. At the lowest price we’ve seen for the 6970, we could pick up 2 of them for $640, which will put the 6990 in an interesting predicament of being a bit more expensive and a bit slower than the 6970 in CrossFire.

March 2011 Video Card MSRPs
NVIDIA Price AMD
  $700 Radeon HD 6990
$480  
$350  
  $320-$340 Radeon HD 6970
  $249-269 Radeon HD 6950 2GB
 
$230-$250 Radeon HD 6950 1GB
GeForce GTX 560 Ti
$249  
  $219 Radeon HD 6870
$160-170 Radeon HD 6850

 

Meet The 6990
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  • Figaro56 - Tuesday, March 08, 2011 - link

    Just be prepared to upgrade your GPU every year. If you think they are going to stop leap frogging performance you are not being realistic. Reply
  • san1s - Tuesday, March 08, 2011 - link

    "AMD even went so far as to suggest that reviewers not directly disassemble their 6990"
    The next picture: The card disassembled
    haha
    Reply
  • Ryan Smith - Tuesday, March 08, 2011 - link

    To AMD's credit, they were good sports offered to take any pictures we needed. So all of those disassembled shots came from them. They were really adamant about it being a bad idea to take these things apart if you intended to use them in the future. Reply
  • strikeback03 - Tuesday, March 08, 2011 - link

    I was looking for a comment on whether you did all your testing before disassembling or whether you got some of their super paste to reassemble. Reply
  • 7Enigma - Tuesday, March 08, 2011 - link

    My problem with the shot is the poor application of thermal paste from the picture. In a card of this magnitude having a perfect coating of thermal compound is critical. And knowing marketing if that is the shot they SHOW, how good do you really think the application is on one purchased in retail channels? Reply
  • iwod - Tuesday, March 08, 2011 - link

    I haven't been following CrossFire / SLI or these Single Card Dual GPU closely. ( Which to me are the same as two card anyway )

    Do they still need drivers to have a specific profile of the game to take advantage? I.e an Unknown Game to the Drivers will gain 0 benefits from the 2nd GPU?

    If that is so, then they are not even worth a look.
    Reply
  • Figaro56 - Tuesday, March 08, 2011 - link

    Most of the big games support SLI and CrossfireX today. For example, I play Battlefield BC2 myself and using 2 video cards blows the doors of a single card and is well worth the investment, especially if you have a 2560x1600 resolution monitor like I do. For 2 ATI cards in Crossfire you install a separate crossfire profiles pack in addition to the catalyst drivers. The profiles pack supports all the game crossfire optimization. The AI mode in the catalyst drivers exploits the game profile pack setting for crossfire so you want that enabled.

    A dual GPU HD 6990 is essentially crossfire on a single card, but for some reason it doesn't perform as well as dual single GPU cards in crossfire. Go figure.

    If you play old games that don't support SLI or Crossfire then YES there is 0 gain. If you have not tried any of the new games what are you waiting for? It doesn't suck you know?!
    Reply
  • cactusdog - Tuesday, March 08, 2011 - link

    I agree, unless you have eyefinity and one slot, paying a premium for heat and noise doesnt make sense. For most people with 1 screen a 6970 or 580 is more than enough. Reply
  • Samus - Tuesday, March 08, 2011 - link

    i'd be shocked if they sold even one of these without it being returned at some point. the noise levels are astonishing. at full blast the thing doesn't even meet federal vehicle emissions noise regulations without being classified as a motorcycle! Reply
  • MadAd - Tuesday, March 08, 2011 - link

    8%? where do we buy tubes of this phase change material? do they sell it like arctic silver? Reply

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