I'm currently looking for a Graphics card(More specifically, a HD 7770) to replace the integrated graphics on my AMD A8-6500 APU, but i am not sure if It would be compatible with my PC, and, more specifically, if i need to upgrade my Power Supply. It is currently the stock 300W psu that came with my pc, which can be found at: http://h10025.www1.hp.com/ewfrf/wc/document?docname=c04100368&cc=us&dlc=en&lc=en#N1327 So, would i need to upgrade to at least a 430W psu to run a HD 7770? Any help would be greatly appreciated!