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Simple question regarding Multi GPU

post #1 of 7
Thread Starter 
Can i have in a system two 680 GPU connected and running in SLI, and a lower card, for instance a 650TI doing only the physics ?
I mean a separate SLI subsystem, comprised of the 680s and a mini card doing the physics, like the 650ti ?
post #2 of 7
Yes.
post #3 of 7
Assuming you meant PhysX, then yes.

But before you take that step, I'd try to find as many tests as possible because if your PhysX card is too slow to keep up with the other cards, your performance will actually drop.
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post #4 of 7
Two GTX 680s should be able to handle both graphics and Physx without too much trouble. I doubt it would be worth adding a third card to the mix.
post #5 of 7
I tried a similar thing.. with a 9500GT a while back.. yeah the PhysX got better but the performance went down and noise jumped. really.
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post #6 of 7
Thread Starter 
Crap. I though something along the lines of 650ti 660ti along a SLI of titans, but that makes even little sense, doesnt it ?
post #7 of 7
660ti would be more than enough, but 650ti might be a tad slow as it's really a LOT slower card ... if it were me, if I was going to go with a separate card for physX I'd look for like a used GTX460, should be able to find a cheap one of those somewhere (a 768MB model would be perfect, as they should be really cheap & memory doesn't matter) & that'd be the perfect amount of power for what you're talking about.

Personally I like having a separate physX card for an SLI rig. Reason being, physX only runs on one GPU, but two cards in SLI have to run at the same speed, so what happens is you get a 'double hit' from the physX load ... one card gets slowed down due to the actual work of the physX, and then the other has to slow down an equal amount, just because. It makes for really sub-par SLI scaling on PhysX games.
Edited by brettjv - 2/2/13 at 8:40am
    
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