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

Last response: in Graphics & Displays
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a b U Graphics card
a b V Motherboard
September 3, 2010 6:15:39 AM

I'm kind of surprised.

http://www.hardocp.com/article/2010/08/25/gtx_480_sli_p...

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?
a c 169 U Graphics card
a c 136 V Motherboard
September 3, 2010 7:31:12 AM

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.
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a b U Graphics card
a b V Motherboard
September 3, 2010 8:11:43 AM

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. :) 
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a c 153 U Graphics card
September 3, 2010 8:42:07 AM

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.
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a b U Graphics card
a b V Motherboard
September 3, 2010 11:06:35 AM

The PCI-E x4 lanes may have been PCI-E 1.0/1.1 which would probably bottleneck the cards then.
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a c 272 U Graphics card
a b V Motherboard
September 3, 2010 1:08:42 PM

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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