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It might have been said, but time the approximate length of gameplay until the crash/reboot. Do this a few times to get a ballpark estimate. Then try using the computer for basic stuff (internet, word processing, things that dont use the graphics card a lot). If you have the same crashes, it could be corrupt memory. If they computer is working fine, its related to the heat output of your video card, as it works harder when processing gaming graphics. Some cards have really crappy fans on them and have to be modified. What is the temperature of your computer while using Internet/Word, etc and what is the temp while gaming? Computers restart when they reach a danger point, to save the hardware. Even if you think you have your cooling worked out, it might not be sufficient enough, or perhaps a fan might be stopped by a cable resting on it.