X4/x4 SLI Offers > 80% performance of x16/x16 SLI

I'm kind of surprised.

http://www.hardocp.com/article/2010/08/25/gtx_480_sli_pcie_bandwidth_perf_x16x16_vs_x4x4/

This was released a week ago...

GTX 480s in SLI x4/x4 mode show more than 80% performance overall compared to GTX 480 SLI x16/x16, and most of the time it's 90% or higher.

PCI-E 2.0 x4/x4 is the same as PCI-E 1.1 x8/x8, so older motherboard users won't have much performance loss either it seems.

Seems like those who intend to buy a x16/x4 PCI-E 2.0 board shouldn't be too discouraged if they want to CrossFireX or SLI for that matter (x16/x4 boards generally aren't SLI certified though).

Be careful with P55 motherboards - the x4 slot is PCI-E 1.1 and offers half the bandwidth, which I would say would impact on performance.

What do you guys think?
5 answers Last reply
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  1. Thanks for the link, it seems that PCI-E 2.0 really makes a difference in CF performance,because dual x16/x8 performed much better than x16x4 with PCI-E 1.0 cards.
  2. Welcome Maziar. This means I can go for a GTX 470 or something high end later on this year and next year adding another in CFX or SLI should work quite well. :)
  3. Does CF still perform horribly at x4, is this just an SLI thing? I could have sworn (like Maziar said) I saw benchmarks where x4 with CF had really bad performance.
  4. The PCI-E x4 lanes may have been PCI-E 1.0/1.1 which would probably bottleneck the cards then.
  5. The x4/x4 setup seems to affect the minimum framerates more than anything but even so that's only on "some" titles, interesting results nonetheless.
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