Using a calculator for wattage, I put some crazy stuff into the equation and even with 30% capacitor aging, as well as maxed out cpu and a gtx 670, it still caluclates to 722w. A 1200w should be plenty. Plus no one has specified exactly what kind of crash they are having. I found a program online that tells me what program has focus and was finding things like Apple cloud and citrix receiver were pulling me from the game to the desktop. The first place I would check is to see what the error states in computer management, in the event logs assuming it doesn't tell you why it crashed. Also too aggressive of an overclock can do this as well.