Ive recently started building my new Gaming rig and have gotten hung up on the PSU. I plan on overclocking my I5 and eventually getting a second 5870 to set up crossfire so i wasnt sure if i should get a PSU larger than the recomended 750 watts. The manufacturer recomended 600watts, but in the tomshardware reference guide they said 750 and I want sure if that number applied if you were going to O.C. Im a Noob at all this so bear with me. Thanks for the help.