Friend of mine has Crossfire 280X's on a Crosshair V Formula-Z motherboard with an AX1200i powering it, a 9590 for a CPU, 16GB of 2133 RAM, and a water cooler. Sometimes he gets random black squares on screen that forces him to shutdown his computer. Temps stay under 70 all the time too, so we don't understand. I think they have bad VRAM, but he can't RMA them because according to the policy they are "still functioning" but only barely. I think only one has bad VRAM because it had a huge temp issue before a BIOS flash fixed it. I was wondering if there was a way to make only one card use the VRAM instead of both sharing like they do.
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