GTX 670 is cooler and consumes about 150+ watts less at max load.
At Skyrim, it really doesn't matter since you'll be running circles around it with those cards. GTX 670 wins at Crysis 2, HD7970 at Crysis. Witcher 2 would be 670, and BF3 would also be 670.
Thank's a-lot great help. I'm gonna go with 2 670's I play most of them with a crazy enb and extreme graphics mod's I saw a video on youtube where a guy was playing skyrim maxed everything on with an enb and everything he only got 30-40fps with a 680 so I don't know
What kind of fps would I be getting with 2 670's playing those games maxed out everything turned on and with graphics mods??? Doesn't have to be exact.