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Why can't SLI be read as a single card?

post #1 of 12
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Curious about this one. A 4870x2 card is a single card, hence read as a single card, no sli, etc...

But two 4870's in sli is read as an sli config and the game must support sli to use both cards.

That said, couldn't motherboard or gpu manufacturers make it so the 2 cards are simply read as a joint gpu where you don't need sli profiles, etc..

I would imagine they wouldn't have to spend all that time optimizing sli profiles, etc..

Or am I missing the plot on this one...
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post #2 of 12
I don't know, but I'm pretty sure the fact that there's two GPUs on one PCB has something to do with it
    
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post #3 of 12
You mean Crossfire.


It is because where the linking of the two GPU cores occurs... on the motherboard and within the OS drivers.
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post #4 of 12
A 4870X2 is read as Crossfire - they are two separate GPU's and need to be addressed like that to be properly utilized. X2's have the same scaling issues, driver issues, usage issues as two separate cards because that is exactly what they are, two GPU's on a single PCB.
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post #5 of 12
For starters SLi is Nvdia and ATI/AMD is Crossfire also a 4870X2 is seen as two seperate GPU's so ye....
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post #6 of 12
If it's an AMD/ATI card then it's CrossFire, not SLi.

The dual GPU cards have an onboard bridging circuit for the two GPU's. The mobo sees them as a single card, but the drivers still have to address the onboard circuit to split up the workload and achieve the full dual GPU capability. Even though the dual GPU cards are seen as one card by the system, the drivers and application profiles still play a major role, and there will be some games that don't use both GPU's.
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post #7 of 12
4870x2 is read as a crossfire setup, 2 seperate cards, crossfire profiles, clock each card seperately, ect,. Same with all the 'x2's.

Edit - Only difference is it automatically switches in/out of crossfire mode depending on 2d/3d application, and also can't run crossfire for a windowed application.
Edited by Darren9 - 4/25/11 at 9:42am
Not SLi any more
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Not SLi any more
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post #8 of 12
I was under the impression that you need to enable crossfire to get full usage out of your 4870X2.
 
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post #9 of 12
Quote:
Originally Posted by Darren9 View Post
4870x2 is read as a crossfire setup, 2 seperate cards, crossfire profiles, clock each card seperately, ect,. Same with all the 'x2's.
AFAIK the 5970 and 6990 are seen as 1 card.
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post #10 of 12
Quote:
Originally Posted by onoz View Post
I was under the impression that you need to enable crossfire to get full usage out of your 4870X2.

It's usually automatic so people dont even think that it's being seen as crossfire.
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