I'm planning on an R9 390, but I was wondering if my corsair rm550x plus gold can handle it. My processor is an i3 6100 (maybe not the ideal match, I know, but the main thing is that it draws very little power) .. my setup on pcpartpicker calculates the total power use to 402 W 🙂 shouldn't that be fine? why is the recommended psu for R9 390 750 W? That seem a little steep!