The Guru of 3D posted a review on the MSI Radeon HD 7770 Power Edition

Guess who's back ? Back again, MSI is back .. with the Radeon HD 7770. While AMD announced a GHz edition, MSI figured, frack we can do better then that and launched an SKU that runs at 1100 MHz ! Yes, the Radeon HD 7770 Power Edition has been released.

Back in February AMD released new GPU's under codename Cape Verde, and the graphics cards deriving from that GPU family where the Radeon HD 7750 and 7770 One GHz edition. This is not a refresh it really is a completely new GPU based of the same technology family that powers the R7900 series, the GCN architecture.

And that's interesting, as with less shader processors AMD will make this product a notch faster. They benefit from the GCN architecture but also have a trump card at hand, as this is the first ever reference card that is clocked at 1 GHz - hence AMD will give all these cards a 'GHz edition' extension. See, the 28nm node allows them to place a good 1.5 billion transistors onto the GPU 123 mm2 die, and that should make the card a good 25% faster opposed to the popular R5770.

  MSI Radeon HD 7770 Power Edition Review