ga-ma78gm-us2h doesn't recognize specific gpu

May 26, 2013
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Hello people! I have a little strange problem with 2 veterans.

The motherboard doesn't recognize an Ati radeon sapphire hd 2900 pro 256 bits edition, but when i put a EVGA geforce 470 gtx it works! I put the ati card on another motherboard (intel dz68db) and works without problem.

I use the same parts:
-coolermaster eXtreme Power Plus 550W
-Amd phenom 9950 black edition

The Bios is up the date

¿Have any idea?