If there are no crashes when running other CPU/RAM intensive apps, it's most likely a video card problem. New card? Could be bad RAM or something else which you can do nothing about except get a replacement. Sounds a lot like overheating symptoms as well. If you have another video card handy try swapping it out.
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"Prohibition will work great injury to the cause of temperance. It is a species of intemperance within itself, for it goes beyond the bounds of reason in that it attempts to control a man's appetite by legislation, and makes a crime out of things that are not crimes. A Prohibition law strikes a blow at the very principles upon which our government was founded." --Abraham Lincoln
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