AMD Radeon HD 6970 & 6950 Debut: Enter Cayman - HotHardware

AMD Radeon HD 6970 & 6950 Debut: Enter Cayman

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We have been hearing rumblings about the products we’ll be showing you today, which are based on AMD’s next-gen “Cayman” GPU, for months now. In fact, back in October we were able to leak a tiny bit of official information in our coverage of the AMD Radeon HD 6800 series, but there’s been rampant discussion, spy images, and other leaks from all around the web for ages. And why not? It has been almost 15 months since AMD launched the Radeon HD 5870, which remains the company’s fastest single-GPU. That’s a freakin’ eternity in Internet time.

As many of you may be aware, Cayman is the codename given to AMD’s newest flagship GPU, which will power the Radeon HD 6900 series (Antilles, aka the Radeon HD 6990, will uses a pair of Cayman GPUs when it arrives sometime next year). Cayman is the successor to the Cypress XT that was employed on the Radeon HD 5800 series, and while it does leverage many of the technologies from that generation, Cayman is a new chip that embraces a fresh core architecture designed to increase efficiency, performance and feature-set.

Cayman does not, however, employ a new manufacturing process. AMD’s typical M.O. is to release a chip using a given process, revise that chip at some point during its life-cycle to enhance performance and/or power, and then release a totally new chip built using a more advanced process 12 – 16 months later. This time around though, TSMC, AMD’s GPU foundry partner (for now) simply isn’t ready with their next-gen 28nm process, so Cayman, like Cypress, is built at 40nm. Because of this, Cayman is actually the largest graphics core that AMD has built to date.

Initially, the Cayman GPU will power two graphics cards, the Radeon HD 6970 and the Radeon HD 6950. And wouldn’t you know it; we have a pair of each in house and have been testing them with a completely revamped test-bed for a few days now. Take a moment to peruse the specs and soak up the first couple of pics of the new Radeon HD 6900 series cards below.  Then we’ll dive into the particulars and check out their performance.


Feast Your Eyes On The Radeon HD 6970

AMD Radeon HD 6970 and Radeon HD 6950
Specifications & Features



And Here's The Radeon HD 6950

As you can see in the two images above, the new Radeon HD 6970 and 6950 look virtually identical from the front, save for their model number decals. We suspect that those specifications may leave some of you scratching your heads, though. If the Radeon HD 6970 is supposed to be an upgrade over the 5870, why does it have a lower total number of stream processors? The Radeon HD 6970 has 1536 ALUs versus 1600 in the Radeon HD 5870, and the 6950 has “only” 1408 ALUs. Well, the answer to that question lies in AMD's new "VLIW4" architecture, which we’ll explain a little later.

Disregarding the shader counts for a moment, you can see the Radeon HD 6970 offers compute performance in the neighborhood of 2.7TFLOPs (single precisions) and 675GFLOPs (double-precision) and the Radeon HD 6950 offers 2.25TFLOPs / 564GFLOPs. The 6970's GPU is clocked at 880MHz and the 6950's at 800MHz. The Radon HD 6970 sports 96 texture units while the 6950 offers 88 (up from 80 in the 5870) and each has 32 ROPs. Both cards are also outfitted with 2GB of GDDR5 memory that utilize a 256-bit interface. The memory speed on the 6970 tops out at 5.5Gbps (1375MHz), while the 6950 hums along at 5.0Gbps (1250MHz). That puts memory bandwidth in the 175GB/s and 160GB/s ranges for the Radeon HD 6970 and 6850, respectively, which is a big step up from the 153GB/s of the 5870. Max board power is 250W for the 6970 and 200W for the 6950, and both have the same digital video output configuration.

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hehe i didn't click the picture to get the article :) my bad. much closer performance this time around, but most games still seem to favor nvidia cards, however, the crossfire beat the sli...i guess it will just come down to your favorite of the 2 companies and whether or not u are running single card, 2-4 sli/crossfire.

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MMcCutcheon:

testing them? where are the benchmarks! :) now if ati could get their drivers worked out..

Did you bother to read the article?

 

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MMcCutcheon:

hehe i didn't click the picture to get the article :) my bad. much closer performance this time around, but most games still seem to favor nvidia cards, however, the crossfire beat the sli...i guess it will just come down to your favorite of the 2 companies and whether or not u are running single card, 2-4 sli/crossfire.

Exactly...

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Very Disappointed , I expected the 6970 to Obliterate the 580, bummerTongue Tied ...But based on what it "turned out to be", its performance and the fact that we are approaching the last days of the holiday shopping season, a more reasonable price would set it in favor of many people and reviews.

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They're selling already at NewEgg. (And at a good price point too)

(got to go read the review now)

Edit: Not really anything Earth shattering with these card's release. They look good, but not enough to change my mind. Updated drivers could improve their performance, but the same could be said for the NVIDIA cards too. If either ATI or NVIDIA had a clear performance advantage across the board, it would make it an easier job to choose between them. I think that we have to keep in mind that both company's offerings are at a very high performance level to start and either choice is a good one that exceeds what today's games can dish out.

I still feel comfortable with my prior conclusions, two GTX570's will do well for me and give me good performance until I have a chance to build yet again. (CUDA & Phys-X capabilities being the deciding factor, and I'm not too interested in three screen gaming so far)

So I guess it's time to quit pondering and waiting, and start actually buying the rest of my parts. Smile

Thanks for the excellent review guys,..........

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Fantastic review, love looking at new tech.

Some what unrelated question, can i put a 6850 and 6870 togather in crossfire? And how bad will it be bottle necked?

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Great review!  I have been waiting for this since they were announced.  I am still having a hard time deciding between Nvidia and AMD.  In the past I always bought Nvidia, but I am really liking what I see from AMD lately.  I think I may just have to give them a shot in the PC I'm building at the moment.  As always you guys are the first ones I found with this review.  I'm not seeing any reason to check any other sites, you guys rock!

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@fat, to my understanding, you can crossfire them, but the performance of the faster card will be throttled down to that of the slow one.

Somehow I knew these wouldn't beat out the nvidia 500 series. But I really like the price point of the 6950. Plus, the cf scaling is awesome. Can't wait to see all the manufactures OC models.

Oh yeah love those backplates. Really didn't expect to see that on their 6950, especially at 300

Long cards, though. No love for my storm scout ( I could make it work :P )

Great Review, Dave

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humm looks like I'll go with the 570GTX this time around for upgrades. Now all i have to do is wait a bit for the $

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That Crossfire performance is remarkable.  Nvidia usually always offered better 2 card scaling.  No more I suppose.

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