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Asus P5B Deluxe - Supports Crossfire?

post #1 of 11
Thread Starter 
I was just on the Asus website downloading linux drivers and I saw the FAQ section and started reading through it and I found this one:

Q) Can P5B Deluxe series motherboard support CrossFire? Since it comes with dual PCI-ex16 slots.

A) Yes, but only with ATI Catalyst 6.9 or later driver.

I thought the P5B had a 16x slot and a 4x slot?
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post #2 of 11
They're both x16 when running one card, but when they run in SLI I believe it runs x16 + x4/x2 (just checked manual).
post #3 of 11
Thread Starter 
But what is the point of them both running at x16 with one card in. That means they won't both be x16 in crossfire.

I thought only P975X worked in Crossfire.
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post #4 of 11
I don't know :\\ placement perhaps? lol.

I wasn't aware the P5B Deluxe could handle CF either.

In the manual though, it clearly states the black PCI-e x16 can only go to x4 :\\.

I might just switch ports with my GTS just to see if it still runs x16.
post #5 of 11
Yeah, it does support crossfire. But not dual-16. The second one is x8, so I was lead to believe.
    
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post #6 of 11
k, I've concluded one runs at x16 and the other x4, regardless of the amount of a single gpu or dual. I think the only reason the x4 is labeled x16 is for the slot type.
post #7 of 11
Thread Starter 
That is a bit cheeky of Asus then. From the FAQ on their website you would assume they would both be at x16.

....not that I will be doing Crossfire anyway.
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post #8 of 11
Even if the second one is x8 we have seen from the 8 series card's that full x16 on both is not needed.
post #9 of 11
Quote:
Originally Posted by JohnRogers View Post
Yeah, it does support crossfire. But not dual-16. The second one is x8, so I was lead to believe.
Yeah, that's what I thought, too.

I can personally confirm Crossfire is possible on an Asus P4B Deluxe. Tested with two x1950pros. But make sure you have enough power (a 450W power supply wasn't enough), and that you set it to crossfire in the Catalyst Control Center.
post #10 of 11
Thread Starter 
But I am pretty sure the second one is 4x and the first one is 16x. At least the manual says that.
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