Don't buy this card

I have a CyberPower PC with 24GB memory and an AMD Phenom II X6 1100T processor with dual monitors. I purchased this card in late June along with a Coolmax 700 PSU. My system had a 600 PDU. I first installed the card with the 600 PSU and the computer would not boot. I installed the 700 PSU and the computer would boot to the login screen (Windows 8.1) and then reboot. I purchased an 850 PSU and was able to boot into Windows. I play World of Warcraft and the first thing I noticed was that when in WOW the screen would flash black for less than a second. Also WOW would sometimes quit responding if I click on a window outside of WOW. This would normally return after about 20 seconds but sometimes I had to kill WOW and restart it. I contacted Gigabyte and the tech support person I talked with stated he had never heard of this problem. He had me update the motherboard bios and reinstall the current 14.4 video drivers. No joy I am going to have to RMA.