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How much does 8x really limit PCI-E

post #1 of 9
Thread Starter 
Hey all

I'm thinking about going for 2 GTX 570s in SLI, but I've also had my eye on Sandy Bridge for a while now. I've read a lot of information about running sli on 8x/8x, but I can never get a clear answer as to which cards will be bottlenecked and which will not.

I realize that I can further splurge on one of the NF200 boards, but is that necessary? Does 8x limit the GTX 570 at all?

Also. Does the NF200 perform below a 16x/16x SLI 1366 socket motherboard would perform with the same cards?

Thanks a lot guys (and gals)
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post #2 of 9
+- 5%
    
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post #3 of 9
I am running dual 5870's in Crossfire (x8/x8) and I do not notice any performance hits. Benchmark wise, my scores are with the rest of the pack.
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post #4 of 9
Thread Starter 
Quote:
Originally Posted by NitrousX View Post
I am running dual 5870's in Crossfire (x8/x8) and I do not notice any performance hits. Benchmark wise, my scores are with the rest of the pack.
Do you think that the GTX 570s would be any different?
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post #5 of 9
The difference in 16x/16x versus 8x/8x is so insignificant that it likely won't matter, in terms of benchmarking and/or gaming performance.

You're fine running them 8x/8x.
    
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post #6 of 9
I was under the impression that the 480 actually noticed a decease in performance when in 8x, I don't think that you'd notice a large enough difference to justify the extra cost for a lucid Hydra or nf200
UNDER $1700!!!
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UNDER $1700!!!
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post #7 of 9
The performance impact is negligable.
    
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post #8 of 9


This was done with a 5870. Lynnfield has a better PCIe controller than X58, so any impact from less bandwidth is made up by a better design.

But you have to remember that Lynnfield's PCIe link is only 250mb/s, which is actually PCIe 1.1 bandwidth, so what you're really looking at is 16x vs 4x, and the difference is almost negligible.

Sandy Bridge's PCIe link is the full 500mb/s, so it effectively has double the bandwidth of Lynnfield, and if Lynnfield hardly shows any impact, Sandy Bridge will show nothing at all.

Given the all around improvements, 8x/8x CF/SLI on SB is probably faster than 16x/16x on X58.
    
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post #9 of 9
Thread Starter 
Would CF 6970s be around the same?
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Light Websurfing
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