XFX 6870 Double Fan

just bought a new 6870 had it a couple days and everything was running nice until when i started playing a game after about half an hour i started to get these weird square artifacts i checked temps they max out at 64c and i tried upping and lowering the voltages i have no idea what it could be but its annoying.
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More about 6870 double
  1. My best guess would be that your PSU isn't providing enough power for your GPU under load. The only possible way to get around this would be possibly underclocking your GPU, though if it is an issue with power than you simply need a new PSU.
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