From Guru3D:

AMD released new entry level graphics cards. The codename for the GPU empowering these cards is is 'Cape Verde', and the graphics cards deriving from it are the Radeon HD 7750 and 7770 One GHz edition. This is not a refresh, it is a completely new GPU based on the same technology that powers the R7900 series, the GCN architecture.

And that's interesting, as with less shader processors AMD will make this product a good chunk 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's 123 mm2 die, and that should make the card a good 25% faster.

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