I tried both Graphics cards with the Q660 and the results are conclusive and I couldn't believe it.
The cheap one ran better than the expensive one
I ran C&C Generals on the Cheap graphics card I pulled 290fps on max settings.
On the big boy card the only way i could come close to the 290fps was by toning down the graphics
So before I return one I'm going to try more games
to make sure I'm not being a complete pillock