dear sir when i fed the above specs on powercalulator it showed i needed 450watt psu.. So i was planning on getting 650 watt. Ya the r9 390 says 750 is recommended but this gfx card is for extreme oc which i wont do. So please suggest in 650 watt range thnk uWith reference to these two threads,
Seasonic S12 II Bronze 620 is bare minimum;
If you think it's better to have some head room, Antec True Power Classic 750 is good enough.