Thermaltake Grand RGB 1200W Platinum PSU Review When you start getting into high power PSUs, there are simply not a lot of brands you should trust expensive hardware to. Thermaltake is one of the oldest high power PSU sellers. Do the Frag Harder Disco Lights help it out when we put it on the load tester? No. Does TT still have the PSU chops to hang at 1.2 kilowatts? Yes, it surely does.