A few months ago I bought a Gateway FX 6800-01e and for awhile it ran fine. But recently it has been overheating. I used RealTemp and at idle the temps read anywhere from the low to mid 50s. As soon as I start playing Far Cry 2 it shuts down. The case doesn't have any place to add addition fans so I'm thinking about upgrading the case to the Thermaltake XPRESSAR RCS100. I have already cleaned the case and am currently using a box fan to cool it.
I'm also wanting to oc the cpu so what would be the best mobo?