Does anyone know what the problem could be? I have a asrock 990 mother board, 1350 psu, 2 r9 290x gpu, 8 gb ram, everything ran fine, then i added a 3rd r9 290x card, everything ran fine for a few days, then my system would shut off. Now i reinstalled windows and computer keeps freezing on either boot up or in windows while doing updates, tried removing the cards and only having one running and system keeps freezing at some point? Please help and thank you!