Gigabyte mobo w/ crossfire support
one AMD HD 7990 card, monitor plugged in to one of the miniDP ports on it, not the dvi port. Proper dual 8 pin power, 750 watt PSU.
Windows 10 fully updated
DXDIAG reports no problems
Radeon software version 19.4.1
Pretty fresh install of 10. Brand new install of 7990, never previously used this card on any pc.
crossfire settings aren't showing up anywhere, and when I try to run either furmark or 3dmark only one GPU core gets warm to the touch, the other stays at idle.
Trying to verify that this card fully works and is stable before my return window closes. Any help would be appreciated!