Although a rehashed 5770, the 6770 clocked at 850MHz on the core with 800 stream processors, 1GB of GDDR5 at 4.8GHz effective speed over a 128 bit bus. This will offer a decent power with zero noise. Custom designed from the ground up utilising 'super alloy' VRM components that are efficient and do not squeal during power load, this could be the choice for HTPC users looking for a bit of punch too.
The 6770 DirectCU Silent Packaging.
The Radeon HD6770 DirectCU Silent 6770