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This is Your GPU having issue related to the clock speed insulted by too high voltage, if You are using any overclocking software bring settings to default, if not try to replace GPU from the socket and plug it back, You may also install overclock software to bring it down as well. Reinstalling drivers may help make sure you clean up registry. if all fails you may have a hardware problem with PSU or GPU one of theme may be faulty, check cables as well.
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Asus P6T V2 Deluxe, I7 930, 3x2 GB RAM XMS3 Corsair1333 Mhz, Nvidia Leadtek GTX 470, Acer 1260p screen projector, Track IR 4 OS ver5, Saitek Pro Flight Rudder, Saitek X52, Win 7 x64 ultimate
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