5770 Crossfire Disabled Adapter problem

[Teckman]

Hello, I am having a problem enabling Crossfire with two Sapphire 5770 cards.

In CCC one of them always shows as "Primary Adapter" and the other as "Disabled Adapter". There is no option for Crossfire.

I have tried:
-Flashing the BIOS of the older card. One is a second generation Sapphire HD 5770, the other is the newest (third). I just purchased the newer one.

-The latest revisions of the 10.x and 11.x drivers

-Switching the cards' PCI slots

-Plugging my monitors into either card.

My system is:
Core i5 2500k
8gb
p8p67 rev 3.0
Fresh Windows 7 install


Thank you for your help

 

[Teckman]

fixed by changing pci speed to 4x in BIOS

 

[2DividedbyZero]

fixed by changing pci speed to 4x in BIOS

changed to x4

from what? i assume it was at x1?

 

[Law-II]

Hi @ 2DividedbyZero

The P8P67 is not intended for full support of crossfire, x4 on PCIE should not notice unless running a 6990 that would require x16 on the PCIE

Slot support for P8P67
1 x PCIe 2.0 x16 (single at x16)
1 x PCIe 2.0 x16 * (max. at x4 mode [Black])
2
3 x PCI
*The PCIEX16_2 slot shares bandwidth with the PCIEX1_1 slot, PCIEX1_2 slot and USB3_34 connector. The PCIEX16_2 runs at x1 mode by default for system resource optimization.

atb

Law-II