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GTX 570/580 and PCI-E 2.0 X8

post #1 of 7
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Thinking about changing my setup a little bit and wondering about GTX 570/580 and the PCI-E 2.0 X8 bandwidth.

I know the PCI-E 2.0 X8 used to be enough for most cards like 5870 and stuff
but

1. Will PCI-E 2.0 X8 effect a single 580?
2. How about two 570 in SLI both in PCI-E 2.0 X8?
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post #2 of 7
you'll be fine with 8x. Even 580's can saturate an 8x slot.

edit for reference: http://www.hardocp.com/article/2010/08/25/gtx_480_sli_pcie_bandwidth_perf_x16x16_vs_x4x4
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post #3 of 7
Kind of confused, but the answer is, no, not really.

Minimal loss if any.
    
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post #4 of 7
It will affect it but it will not be worth even thinking about, x8/x8 is perfectly acceptable for even dual 590s.
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post #5 of 7
Both of my 580s are running at x8 off the CPU and it's working perfectly.
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post #6 of 7
Whether it is single card or SLI, x8 brings about 2% performance loss for GTX480 which is just similar to GTX570/GTX580. Therefore, it is only minimal impact .

http://www.techpowerup.com/reviews/NVIDIA/GTX_480_PCI-Express_Scaling/24.html

http://www.tomshardware.com/reviews/pcie-geforce-gtx-480-x16-x8-x4,2696-16.html
post #7 of 7
Quote:
Originally Posted by windfire;15193848 
Whether it is single card or SLI, x8 brings about 2% performance loss for GTX480 which is just similar to GTX570/GTX580. Therefore, it is only minimal impact .

http://www.techpowerup.com/reviews/NVIDIA/GTX_480_PCI-Express_Scaling/24.html

http://www.tomshardware.com/reviews/pcie-geforce-gtx-480-x16-x8-x4,2696-16.html

x8/x8 is a completely different animal than x16/x16 off the X58 chipset with LGA 1366. The PCI-e link with X58 was not present on the CPU and therefore had to be connected to the CPU which created a bit of lag.

If you compare a single GPU running x16 on SB and a single GPU running on X58 @ x16 the SB should pull ahead because of little to no latency.

I went from X58 with two 580s to Z68 with the same cards and saw little to no difference between the x8/x8 off SB and x16/x16 on X58 probably not even 2%.
Edited by blackbalt89 - 10/6/11 at 9:57am
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