For overclocking today we are using the latest version of Sapphire's excellent TriXX software tool.
We managed to push the XFX HD7750 Black Edition from 900mhz to 1,052mhz, a 16.8% overclock. The GDDR5 memory could be pushed from 1,125mhz to 1,254mhz – a 11.4% overclock. Good results.
The overclock helps push the XFX HD7750 Black Edition above the last generation HD6790, to 3,250 points.