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Can AMD GPU's go triple ? - Page 2

post #11 of 24
Quote:
Originally Posted by Le_Loup View Post
How so ? (i'm new to this sli/xfire concepts)

6990
6990
6970
6990

? But single output? (Mb i'm wrong in perception)

- Le_Loup
Thats right, the HD6990 functions as one card, but it has 2 GPU's on it. So its 2 cards glued together to work on one, so quadfire requires only 2 6990's, and tri is a 6990 + some other 69XX card.
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post #12 of 24
Quote:
Originally Posted by Smoblikat View Post
Thats right, the HD6990 functions as one card, but it has 2 GPU's on it. So its 2 cards glued together to work on one, so quadfire requires only 2 6990's, and tri is a 6990 + some other 69XX card.
Glued isn't the right term. They co-exist on a single card and share a bus and have access to their own ram and, if I am not mistaken, talk to each other on the same card as well while interfaced with the rest of the machine via the PCIe slot.

There is a bridge chip on the card itself to allow on-card crossfire but can easily be disabled via CCC. Same is for the 590.


Anyways as long as a card has 2 SLI (nvidia) or crossfire (ATI/AMD) slots on it, you are good to go ^_^
 
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post #13 of 24
Yep, check my sig rig.
I have a 4870x2 and a 4890 in tri-fire.
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post #14 of 24
I have tri-fire in my system with a single 6990 + a 6970. Works a treat!
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post #15 of 24
Quote:
Originally Posted by Erick View Post
Actually, with the hd6990 you can only use 2 physical cards but its not crossfire its quad-fire, since each 6990 has 2 gpu cores, meaning, 2 HD6990 = quad-fire.

2GTX590 = quad-sli

Showdown:

2HD6950/70 = crossfire
3HD6950/70, or 1HD6990 and 1 HD6950/70 = tri-fire
4HD6950/70, or 2HD6990, or 1HD 6990 and 2HD 6950/70 = quad-fire

2GTX580 = sli
3GTX580, or 1GTX590 and 1 GTX580 = tri-sli
4GTX580, or 2GTX580 and 1 GTX590 or 2GTX590 = quad-sli
You can't mix the 590 with any other card. 590 will not work with 580.
    
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post #16 of 24
You can implement a single 6970 with a single 6990; or two 6970s with solitary 6990, & finally a pair of 6990s. It's a very flexible technology, and the intense re-architecture of crossfire has provided phenomenal scaling up to it's maximum iteration (quadfire).
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post #17 of 24
Quote:
Originally Posted by djriful View Post
An exception to HD 6990. You can only Crossfire it not Trifire or Quadfire.
In his defense, I believe what he meant is you can't have four 6990s hooked up together. Which is true, just not worded clearly.
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post #18 of 24
Quote:
Originally Posted by Anthraxinsoup View Post
You can't mix the 590 with any other card. 590 will not work with 580.
Why so? 590 just has 2 580 cores, so it should be good. If I am wrong then I am not totally wrong because you can definitely do it with Lucid's Hydra.
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post #19 of 24
Quote:
Originally Posted by johhu12 View Post
Why so? 590 just has 2 580 cores, so it should be good. If I am wrong then I am not totally wrong because you can definitely do it with Lucid's Hydra.
Lucid Hydra sucks, and scales horribad, and you can do any match with Lucid ontop of that. Also, nVidia doesn't allow it, that's why. They have no reasons.
    
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post #20 of 24
Quote:
Originally Posted by Anthraxinsoup View Post
Lucid Hydra sucks, and scales horribad, and you can do any match with Lucid ontop of that. Also, nVidia doesn't allow it, that's why. They have no reasons.
There's a thread over at xtremesystems testing Lucid on a Asus Crosshair 4 Extreme with 2 Nvidia cards and Lucid produced better results and higher scaling then using the SLI hack.

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