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post #21 of 29
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Now I think i'll just go with one 6990 and thats it.
   
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post #22 of 29
Great tri-monitor review with 6990 CrossfireX today.

http://www.guru3d.com/article/triple...d-radeon-6990/

Sorry if that was already posted.

Many games just don't scale well past 2 GPU's yet.

I would get two 6950's and save a ton of money.
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post #23 of 29
Quote:
Originally Posted by ezveedub View Post
If you have a motherboard with only two PCI video slots, the 6990 + 6970 will trifire as 3 GPUs. If you're happy with only 2 cards, then the two 6970 are fine. For me, I want to watercool, so two 6970 waterblocks will be more than a single 6990 waterblock. It all depends on what you're setting up. The 6990 stock is just a tad slower than the crossfire 6970, barely anything IMO
but how come nobody talks about the fact that crossfire isn't compatible
with every game out there? whereas a 6990 will get those performance
benefits in every game guaranteeed
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post #24 of 29
Quote:
Originally Posted by Tralala View Post
but how come nobody talks about the fact that crossfire isn't compatible
with every game out there? whereas a 6990 will get those performance
benefits in every game guaranteeed
Dude, do you realize the 6990 is crossfired? It's got an internal cfx bridge.
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post #25 of 29
Thread Starter 
Quote:
Originally Posted by compudaze View Post
Great tri-monitor review with 6990 CrossfireX today.

http://www.guru3d.com/article/triple...d-radeon-6990/

Sorry if that was already posted.

Many games just don't scale well past 2 GPU's yet.

I would get two 6950's and save a ton of money.
maybe i'll get it, not really sure now.
   
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post #26 of 29
Thread Starter 
what CPU speed do i need to oc to for a 6990 or 2 6970s to not bottleneck?
   
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post #27 of 29
Quote:
Originally Posted by InterestedThirdParty View Post
really i heard that the 6990s are actually very quiet and only somewhat hot(what card wouldn't be).
Yes, but he was referring to an overclocked version. At stock, the 6990 is slower than a 6970, but it can easily be overclocked to equal the 6970's.
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post #28 of 29
Quote:
Originally Posted by compudaze View Post
Great tri-monitor review with 6990 CrossfireX today.

http://www.guru3d.com/article/triple...d-radeon-6990/
Many games just don't scale well past 2 GPU's yet.
Not entirely true. I would say some games don't scale well past 3 GPUs.

4 GPUs scaling is bad, that's true, particularly when using 4 GPUs on 2 cards, like 2 X 6990 or 2 X 590.

But don't confuse this with Tri-Fire. Tri-Fire (6990+6970) scales pretty well, and is the ''sweet spot'' for multi-GPU.

But since you can do this ONLY with AMD, alot of people don't know this, because with Nvidia, it's 3 card for Tri-SLI. But with AMD 6xxx serie, 3 GPUs on 2 cards is scaling really well actually.

And often, Tri-Fire is better then 2 X 6990 or 2 X 590.
Edited by Levesque - 4/1/11 at 5:15pm
    
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post #29 of 29
Quote:
Originally Posted by Levesque View Post
Not entirely true. I would say some games don't scale well past 3 GPUs.

4 GPUs scaling is bad, that's true, particularly when using 4 GPUs on 2 cards, like 2 X 6990 or 2 X 590.

But don't confuse this with Tri-Fire. Tri-Fire (6990+6970) scales pretty well, and is the ''sweet spot'' for multi-GPU.

But since you can do this ONLY with AMD, alot of people don't know this, because with Nvidia, it's 3 card for Tri-SLI. But with AMD 6xxx serie, 3 GPUs on 2 cards is scaling really well actually.

And often, Tri-Fire is better then 2 X 6990 or 2 X 590.
Tri-Fire does seem to work well if you have a resolution to take advantage of it.

http://www.tomshardware.com/reviews/...g,2865-10.html
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