Yeah its my and i finally got tired of it running slowly, especially with only 256MB of vram on it, so i decided to overclock it a bit and see what I get. My card came factory overclocked so it already ran faster then the standard stock. I currently have it running as following (says RivaTuner, NVIDIA drivers say its 1MHz lower):
Download Furmark or a similar GPU-stress testing application. Run it for awhile, as long as there's no artifacts, and the temperatures are within the acceptable range (check the manufacturer's website for maximum temperatures) you should be good.