Chinese VR-Zone apparently managed to get their hands on HD 7770 and put it through 3DMark 11 where this card scores P3535 marks. This makes the HD 7770 a decent performer fitting it somewhere between HD 6850 and HD 6870, which is pretty much what we have been hearing from various sources.
In case you missed it, the Radeon HD 7770 is based on AMD's 28nm Cape Verde GPU and features 640 GCN stream processors. It packs 1GB of GDDR5 memory paired up with a 128-bit and all under 85W of TDP. The HD 7700 series based on Cape Verde will be one of the first cards to have a reference 1GHz GPU clock while memory should be clocked at 1125MHz (4.5GHz effective).
We have already heard that, performance wise, HD 7770 should end up pretty close to the HD 6870 at only a fraction of the power consumption. Don't get us wrong as Radeon HD 6870 will still be faster, but it will also still be a bit more expensive than the HD 7770. The HD 7770 will definitely be a better choice over the HD 6850 as it should have a much better performance/Watt ratio.
Currently, the price of the HD 6850 is pretty close to the rumoured launch price of the HD 7770 and it is still not clear what will AMD, and its partners, do to keep the sales of the HD 6850 going, since there is a decent amount of HD 6850 still available on the market. We might be looking at a price drop or even rebranding of some sort, but that is something that we still can't confirm.
In any case, HD 7700 series looks like a pretty good deal and all we need now is to see the entire set of benchmarks.
You can check out our review of the factory-overclocked XFX Radeon HD 7770 1GB Black Super OC DD graphics card here.