I recently upgraded my GTX 260 for a r9 290 (quite a jump) and everything works fine except the random black screens every so often. It's usually 10-15 mins into my first game of the day. After a restart it doesn't seem to happen again the whole day. I was worried about my power supply not being enough, the box recommends minimum of 750w, mine is a 730w and i have been reassured that 500/550 is enough so i can't think what else it could be. I have the newest drivers and have thoroughly deleted the old nvidia ones. Any suggestions?