Lately, my PSU has not been up to snuff. I bought a Thermaltake 420w TR2 about 1.5-2 years ago, so the capacitors have aged a bit. Also my current voltages have been a bit unstable. (Large variations, even in the bios. They are about randomly +-10%) It just seems my PSU can not handle the load of when my comp is working fully. The eXtreme PSU calculator says I need about 300 watts for my PC. (My system specs are in my profile) I have also overclocked my video card by about 23%, so that adds to the drain as well. I was thinking about getting a new PSU because the drain seems to be high. (And my PSU's fan is quite loud also ) I would also like to get a re-branded Seasonic PSU, I have always heard good experiences with them. I think PC Power and Cooling, Corsair, and Seasonic itself are the main ones. Currently though, I am looking at two Corsair PSU's: http://www.newegg.com/Product/Product.aspx?Item=N82E16817139005 http://www.newegg.com/Product/Product.aspx?Item=N82E16817139006 Which one do you think I should purchase? (Mainly wattage now) Is 750w a bit of overkill? The nice thing with the 750w one is the fan does not start to spin faster until about a 375w drain. (Corsair always have well documented product explanations: http://www.corsair.com/products/tx.aspx) I regretted it when I bought my Thermaltake, I cheaped out on that one, lol. (Didnt buy a Seasonic :shadedshu ) So overall is a 650w PSU sufficient, or should I buy a 750w one? Thanks.