I'm inclined agree with 2010rig i honestly don't think your average 7970 will hit 1200/1650 and your 7950 1100/1500 or better, not on air at least. I would assume that most 7970s can achieve 1125/1575 or around those clocks. That's not to take away from them because they are still great overclockers, lets remember 200mhz over stock clocks on both the memory and the core is no slouch. The 770 vs 7970 argument basically ask which company do you like and how much are you willing to pay? Because they both pretty much equal each other with the 770 being more expensive at the moment.