Summary: The Radeon HD 7770 SKUs are great little cards for simple PCs on which you can actually play a handful of games pretty darn well. Best served of course are the cards placed into a HTPC. But let's talk overall about AMD's baseline and reference implementation first.
Summary: The biggest issues when it comes to overclocking the HD 7770 yourself is that some companies have opted for such large out of the box overclocks giving us little gains over other offerings currently on the market. The bigger appeal to a lower clocked out of the box card is the price.