Hello, I just recently purchased an HIS Radeon HD 7970 and when I went to test it out for the first time in Assassins Creed 3 problems started to arise. Even on the lowest settings the card would whine too much and the heat would get into the 60 degrees Celsius. On high however, the card started to make an odd buzzing, increase the whine, and would get into the 70 degrees. In the actual game, large white lines appeared across the display in a random horizontal and vertical formation. Help!
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Make sure the drivers are current, if that doesnt help it sounds like you have a defective card on your hands. Since its new you would probably be better off just RMA'ing it for a new one.