Really? So the 5770 is exactly the same as a 4870, just with DX11?
Forgot to say I'll be mostly using this for gaming, with games such like Dragon Age, Fallout 3, and some future releases... nothing like Crysis though.
It is about the same newer tech with low power draw. There is plenty of benchmarks out there for example; http://www.tomshardware.com/reviews/radeon-hd-5770,2446.html