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6970 CFX with P8P67 PRO

post #1 of 11
Thread Starter 
I've just ordered 2 HD6970s but the specs of the P8P67 PRO say that:

2 x PCIe 2.0 x16 (single at x16 or dual at x8/x8 mode)

Does that mean that when my 6970's arrive and I finally install them, they'll only be running x8+x8?
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post #2 of 11
that is correct. If you want 16 x 16 you need a board with the n200 chip on it, ud7, ws revolution, maximus
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post #3 of 11
x16/x8 vs. x8/x8 = a minimal difference in frames per second for gaming.
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post #4 of 11
Thread Starter 
I take it that x8/x8 will cause a performance drop?
Edited by Mobius01 - 3/2/11 at 12:22pm
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post #5 of 11
Quote:
Originally Posted by Mobius01 View Post
I take it that x8/x8 will cause a performance drop?
less than 5% hit.
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post #6 of 11
Thread Starter 
Quote:
Originally Posted by JedixJarf View Post
less than 5% hit.
Yeah, I've just read a review of x16/x16 vs. x8/x8 and according to it, the only performance hit was seen on multi-monitor set-ups:

Quote:
If you are running on a 30" display at 2560x1600 or below, an x8/x8 SLI or CFX configuration will perform the same as a x16/x8 or x16/x16 configuration. The only time that you should even be slightly concerned about running at x8/x8 is when you move up to a multiple display setup. When we pushed to 5760x1200 we saw up to a 7% difference in performance between x8/x8 and x16/x16, in favor of x16/x16, but that was in one game only.

Edited by Mobius01 - 3/4/11 at 11:32am
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post #7 of 11
Thread Starter 
I might wait for the 6990 as it'll only need the single x16 lane.

Not until they release some specs, of course.
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post #8 of 11
Quote:
Originally Posted by Mobius01 View Post
I might wait for the 6990 as it'll only need the single x16 lane.

Not until they release some specs, of course.
That will be two cards doing x8/x8 in a x16 lane. Same thing as you're asking. And to confirm it makes little to zero difference. Hell even x4/x4 is single digit difference to x16/x16. 2x 6970 will be faster than 6990 afaik.
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post #9 of 11
If I'm not wrong, the 6990 will be dual 6950. So 6970 CF > 6990. It might be right or wrong. We still have to wait for the official benchmarks.

-Luxio
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post #10 of 11
Thread Starter 
Good job I didn't cancel my order for 2x 6970s then, lol.
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