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So im trying to push the OC on my sapphire 2g 6950 dirt 3 edition even further, I got it to 935 core and 1377 mem volts are 1.160 i run it in heavens benchmark for 20-30 mins and the screen splits right down the middle, ive gotten my card stable at 930core 1330 memory, without any issues, why is overclocking my memory to 1375 causing the screen to split? do i need to add more volts?