dont waste time, 7000 series is WAY better. AND 7750 > 6770.
The HD7770 and 7750 have a great performance to watt ratio, but a 7750 is not better than a 6770. At best it is almost
as fast as the 6770, and has the advantages of: being a single slot card, having a low power draw, and no requirement for a 6-pin PCIe connector to supply extra power. if I was going to spend the money that a 7770 costs right now, then I would buy an HD6850. The HD 6850 is about the same price or cheaper on sale and trounces the 7770.