The mainstream AMD Radeon HD 7800-series has launched, in the forms of two cards: HD 7850 and HD 7870. It seems as though these cards pack quite the power for their price, with performance per Watt quite high.
The HD 7870, according to benchmarks, seems to keep up with cards like the GeForce GTX 580 in Metro 2033, and only lose out to its bigger brothers in the HD 7950 and HD 7950 by a few frames per second. Quite the amazing card if I do say so myself! Check out the reviews below:
TweakTown - HD 7850
TweakTown - HD 7870
Hardware Secrets - HD 7850
Hardware Secrets - HD 7870 GHz Edition
The Tech Report - HD 7870 GHz Edition