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post #681 of 3024
A 8x slot will be fine! Your cards probably wont use enough band width to notice the difference
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post #682 of 3024
x8-x8 vs x16-x16, difference? Close to 0.

I run both 6970's @x8 and get better performance than people with 1366 motherboards @x16

You won't lose performance
    
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post #683 of 3024
I am running x16/x16 and it looks like this:


The temps on the bottom card (sapphire) are manageable, as it has room to "breathe". However top card (XFX) obviously has issues dissipating the heat with that small gap. Would I be able to run x16 and x8? Or would that mess everything up
post #684 of 3024
You cold run x8-x8 fine

At most you will maybe lose 1fps... AT MOST

So I wouldn't worry, put it a slot lower to get it to breath
    
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post #685 of 3024
the differences between x8 and x16 are a small margin AT MOST. I agree with kcuestag lower it a slot and give that top card room to breathe.
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post #686 of 3024
Ohhhh I got it. If i drop the 2nd card down to x8, it will automatically bring the top x16 card down to x8 match. So GPUz will show x8 on both. Yea I will very likely be shifting this when I rebuild into my 650D that shipped a couple days ago, and I will test in-game performance. It would seem from the above posts I won't see too much difference... If anything the better temps on the GPUs w/o ramping fans will actually offset the minor performance loss. (I can just OC them more anyways )
Edited by nerdybeat - 4/24/11 at 1:04pm
post #687 of 3024
You could lose at most 1fps...

Performance loss is less than 1%
    
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post #688 of 3024
thanks guys, + rep
post #689 of 3024
No problem, glad to help any time

Let us know how it goes
    
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post #690 of 3024

Here you go fellow Xfire users.


PCI-E 16x compared to 8x with two GTX580's.
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