To my understanding, the 7770 is newer, but has fewer SPU and a smaller memory interface.
Not my MOBO only supports PCI-E 2.0.
So which GPU is better, the 6870 or the 7770 OC'd?
And also, how much power will those GPU's use? I know the base 7770 uses less power than the 6770, but how much more power will the dual fans and OC require? I only have 2 18A 12v Rails (CM EP+ 600 watt)