The quality, wattage and power efficiency of this PSU - is it good enough for an R9 390 Twin Frozr? The wattage seems to be fine according to PC Part Picker and the quality seems to be intact for the most part, but I just want to double check.
The G2 model, made by Super Flower, is one of the best power supplies made. Gold efficiency will help lower power consumption. With an Intel CPU, the 650 G2 is more than enough power. The 750 G2 is only $3 more and is much better value. If you plan to crossfire a pair of 390's a 1KW PSU is recommended.