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Gray Screen with Vertical Stripes problem

Hello, i'm having this issue with my new Sapphire HD 7870 that i bought 1 month ago. When i'm playing games for like 5-30 minutes the computer freezes and a gray screen shows up with vertical lines in it. When it happens i can't do nothing but turn off the computer holding the power button. I have already checked the temperatures and they are fine. I have updated to the last catalyst driver too. Anyone have some clue on what is happening to my video card? (Sry for bad english)
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