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Yea I get that too in some games. Looks like black lines that come on the screen every so often. I know its not overheating either. Sigh...
Or if you're up to it, try installing a third-party GPU heatsink. I've no idea how difficult it is to do that, but I can't imagine it's much different from installing a CPU heatsink.
You should probably invest in some AC before an aftermarket heatsink
My house doesn't have AC, and during the heatwave here (~40 Celsius), my computer would just shut off after about two hours of gaming, and wouldn't turn back on for 30 minutes after that. Granted, I'm running a really terrible AthlonXP 1800+ with the stock heatsink in, but still. My CPU was reaching temperatures over 70 Celsius on IDLE.
Remember, heatsinks do nothing if they're replacing hot air with more hot air