Try changing the core and memory clock settings to the non-ghz version, then find an aggression profile for the non-ghz. The GHz is just a card that was over clocked at the factory because it was more stable than others over clocked.

I heard somewhere that Bitcoin is designed to be produced past 2100.

Having fun in newbie land right now...
I need some advice on my 7970 rack rig, but i'm fine getting grouped with people trying to mine on their android phones