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16x and 8x motherboard CROSSFIRE?

post #1 of 7
Thread Starter 
Will these be noticeable compared to 16x 16x? Do you think I should just buy a new motherboard with 16x 16x with the 890 chipset?

Or is this a bad decision b/c of the new AMD chips coming out etc....?

Thank you, I have crossfire 4890's with the ASUS m4a79xtd EVO.
post #2 of 7
There's almost no difference compared to x16/x16.

Quote:
Our bottom-line on this subject is that there is every reason to be optimistic when opting for two of these accelerators on motherboards with two PCI-Express 2.0 x16 (electrical x8) slots, because the performance penalty between that and PCI-Express 2.0 x16 (electrical x16) is just too small.

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post #3 of 7
From everything I have read you get a negligible difference in real world operation, the only thing you may see more of a penalty from is benchmarks though imo that isn't worth investing in a new board, mine is 8/8 and I cant say I have any issue with its performance
    
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post #4 of 7
A single GTX480 running on an x4 slot lost about 5% of performance running as sole GPU for a gaming rig in that example. Yes, you want a pair of x16 slots for absolute maximum performance, but x8/x8 is perfectly fine and you won't lose anything worth noting.
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post #5 of 7
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post #6 of 7
I've run Tri-fire at 16x/8x/8x with no issues. On my sig rig my GTX465 is running 8x while folding. No issues at all.
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post #7 of 7
Thread Starter 
Thanks for the responses guys, I really appreciate it.
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