I have just bought another 270x to crossfire and of course running 270x Crossfire on a 600w PSU (Corsair CX600M) is insane. I plan to get a 750w PSU next week and was wondering if for only this week I could use my lower end PSU to power both cards without risking the health of my PC for just one week. Putting my entire system into a PSU calculator it only recommended 574w.