I already am running a dual psu setup , i booted the secondary psu with a cable cut from an old psu , i bought and returned an r9270x and am waiting for a refund so that i can order an r9280x i have a 600w and 500w PSUs , And i am thinking to use the 500w one to power my MB And Processor and use the 600w one to independently power my Gcard on arrival ? Safe ?