Sorry about the late response and the fact that the people that set out to help you began arguing like "fanboys" usually do. 650w will be enough, I'm running an overclocked 7970, i7 930 and 12gb 1600mhz ram with a 620w PSU but you might want to swap it anyway, depending on the brand and efficiency level certification. (bronze, silver, gold and platinum) Another tip I should give you is NEVER save money on the PSU. It's the most important component in your PC and if it fries, it will fry other components if it lacks safety procedures. Make sure the PSU you have or buy in the future have most of these protection services: SCP - Short circuit protection OPP - Overpower (overload) protection OCP - Overcurrent protection OTP - Overtemperature protection OVP - Overvoltage protection UVP - Undervoltage protection Don't cheap out, you might end up having to spend ALOT more if you try to save a few bucks and buy a cheap PSU.
