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Dual x8 vs x8/x4

post #1 of 9
Thread Starter 
So I just recently ordered my new sound card (Xonar ST) and realized with my two 580s, it simply won't fit if both cards use the first two PCI-E slots that are x8/x8 in SLI. So my only other option is to use the second card on the third PCI-E slot which is only capable of x4. I was just wondering if there will be any noticeable performance difference between two 580s at x8/x8 and two at x8/x4.
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post #2 of 9
just put the soundcard in the first PCI slot

so it would be like:

PCIe 1x (empty)
PCIe 16x @8x (580 #1)
PCIe 1x (empty covered by 580)
PCI (soundcard)
PCIe 16x @ 8x (580 2)
PCI (empty, covered by 580)
PCIe 16x @4x (empty)
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post #3 of 9
Thread Starter 
Trust me, there's no way a sound card will fit in the PCI slot between the first two PCI-E slots. Not with two 580s.
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post #4 of 9
I trust you, but why not?
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post #5 of 9
Thread Starter 
I'm pretty sure putting the sound card there will touch the fans on the 580. The PCI slot is dangerously close to the card.

Anyway, can someone please answer my original question?
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post #6 of 9
The Lightning is a dual slot card, isn't it? If it is, the sound card will in fact fit in the PCI slot, because it should conform to the standard sizing of PCI cards. Just make sure you lift up the 580 as you're tightening the screws, make sure it doesn't drop.

And yes, you will see a performance drop with 4x and a 580. Will you notice it? Maybe. But it will be there.
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post #7 of 9
on top of being a 4x slot, it has to go through the PCH, so it will also gain quite a bit of latency there.

I would try and see if you can fit the soundcard between the other cards first. If it doesn't work, then it's new motherboard huntin' time
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post #8 of 9
I would sell sound card and buy titanium HD but i bet u can put sound card into pci 1 (on right side of white pci-e x16)
Edited by LukaTCE - 10/11/11 at 12:12am
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post #9 of 9
There will be a noticeable performance drop if you put it in the 4x slot. We have the same motherboard and my X-Fi soundcard is placed in the PCI slot right under the first GTX 570 no problem.
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