Computer restarting

[Freakin]

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its possible that while 4 tabling, that your video card is either pulling too much power from the power supply, or your video card is overheating, those would be my first two guesses

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Insufficient power supply is definitely my first bet, though it shouldn't really be an issue for a bunch of 2d apps.

Is it restarting, or do you get a BSOD? Does this ever happen when you are running multiple memory-intensive apps?