Just wanted to check about this! Is a 550W power supply enough for an 8800GTS? Reason being I've been getting quite poor performance (5000 odd marks on 3DMark 06 etc). I've been assuming it's the processor holding it back (3500+) which I'm planning on replacing with something a little faster. Do I need to replace the power supply too? Currently I have a HEC-550TD-PTE 550w. Cheers