I want buy R9 390, but im not sure, can i use it with my old power supply. Now i have inwin 750w (ip-p750bk3-3). Will it works fine with R9 390 and FX 6350/8350? Power supply 80 plus bronze, but only 25 amp on 12v lines. Or it doesn't matter? Sorry for my mistakes, i have practice in it a long time ago.