a rare dialup modem? Anyway your 600watt psu from ocz can easily run that 8800gts. My old pc setup in my older case was an 8800gt and it was running well with a 460watt coolmaster real sli psu. It was 80 plus and I know yours is too so you will not have a problem. Heck I just bought a new 5850 and Im running it with a coolmaster real power SLI 550watt PSU!