Im not a fan of thermaltake PSU's, but cant see a problem with the existing uint providing its on good working order. How old is it ?
I am using it for almost 2 years. Sometimes I get problems when rendering 3d's, Its kinda laggy when I render and also when I use 3dsmax, when I get to many polygons when modelling, rotating the viewports kinga lags........
Personally i would get a 650w, that's a decent amount of ram and a pretty high end CPU, better be safe than sorry =P
thanks. I am planning to buy Silverstone Strider 750w Modular Power Supply. Is this psu okay?