I have received a HD 7990 today. While booting my PC gives me an error that there is a problem while initializing the gpu. After that installed a gt 710 just to output a picture. after further inspection the 7990 is registered by device manager, gpuz, hwinfo and the amd driver from the system previous gpu. But still the 7990 refuses to boot.
The System in wich i tested the 7990:
Xeon e5649@4,0 Ghz
MSI X58 Pro-E