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Crossfire question

Last response: in Graphics & Displays
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So i got a 7770 vapor X Sapphire and i want a second card to crossfire, i been checking some benchmarks and i see that it can outperform the 6870 in most of the cases, from my point of view is like playing with a new toy at a very competitive price, i think it will be fun , my question is should i crossfire even if my pci express in my mobo is 16x-4x mode, or it will be a pain in the ass.

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ideally you would like 8x/8x. by doing 16x/4x i would think the 4x would lose about ~6% performance on a 4x slot

look at the 7970 for example when under 4x as a standalone card:


@above, i agree it doesnt outperform the 6870, but with the 12.11 changes, it definately now surpasses the 6850 and is probably somewhere between the 2 in performance, at a lower power consumption(albeit smaller bus)
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dudewitbow said:
ideally you would like 8x/8x. by doing 16x/4x i would think the 4x would lose about ~6% performance on a 4x slot

look at the 7970 for example when under 4x as a standalone card:
http://tpucdn.com/reviews/Intel/Ivy_Bridge_PCI-Express_Scaling/images/perfrel.gif

@above, i agree it doesnt outperform the 6870, but with the 12.11 changes, it definately now surpasses the 6850 and is probably somewhere between the 2 in performance, at a lower power consumption(albeit smaller bus)

you beat me to it, i was going for that benchmark, saw your post and stopped.

what i was going to add was "how much of a difference is ~6%?"

if you use 60 fps then 6% would be 3.6 fps less or 56.4.

noticeable?

Guys, you're mistaking the 7770 and the 7770 Vapor-X which is a good ~15-20% faster than a reference 7770. The Vapor-X, with current drivers, might be able to edge out the 6870. I guarantee that two 7770s in CF beat a 6870 greatly in almost all gaming performance comparisons.

garrettk4 said:
@blazorthon look at amuffins link it has graphs with the 7770 vapor x being out performed by the 6870...


Look at the driver version in that link. Honestly, I don't think that the Vapor-X will edge out the 6870 overall, but with current drivers, it can in some games.
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