RD480 + Asus + 2 x 1900 Crossfire = Problems

@ 2006/02/27
We spoke with ATI's top shot motherboard engineer and he told us that it either had some power problems and as the memory acted strangely he said that it could be a BIOS prob as well. We hope he is right as we failed to test two X1900 Crossfire cards on this setup. Luckily for ATI, the RD580 works rocks stable with those two cards and we are talking first hand here.
Comment from Sidney @ 2006/02/28
It was all Intel's doing on the 2 12-volt rails. Now, let's go back to the old way, single rail. If it ain't broke don't fix it?
Comment from jmke @ 2006/02/27
Single rail PSU solves RD480 Crossfire problems

-- ATI key motherboard designer John Bruno told us that a single rail PSU is better than a multi rail PSU. He reported that ATI had some issues with multi rail PSUs while all of the single rail 500 W + PSUs were running fine. It turns out that both OCZ Power stream 600 W PSU and Akasa 650W PSU are using more than one power rails. --

http://www.theinquirer.net/?article=29940