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X4/x4 SLI Offers > 80% performance of x16/x16 SLI
Sep 3, 2010, 6:15 AM
I'm kind of surprised.
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?
Sep 3, 2010
Sep 3, 2010, 7:31 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.
Sep 3, 2010, 8:11 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.
Pci-e 3.0 x16/pci-e 1.1 x16 on gpuz?
Is the x8 mode in 750i SLI a great performance hit?
X16 vs. 2.0
X16 vs dual x8?
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Sep 3, 2010, 8:42 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.
Sep 3, 2010, 11:06 AM
The PCI-E x4 lanes may have been PCI-E 1.0/1.1 which would probably bottleneck the cards then.
Sep 3, 2010, 1:08 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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