I have been able to play WoW at max settings (shadows, multi-sampling, particles, etc..), MW2 at max, spore at max, minecraft at max, and starcraft II at ...high... with 50-60 fps (monitor's highest setting) and no issues, but today I tried to play Age of Empires Online, and after an hour, my computer cut off and restarted. I changed some settings in the game and tried again and after 10 minutes, it reset once more. The third time, I set my cpu fan to manual-maximum ( thinking the intel safety functions were cutting it off at a certain heat ), and it cut off after 10 minutes again. The time intervals are a rough estimate, of course. this problem only occurs on windows 7 (i haven't used anything else for long enough time to recreate the outcome). CPU temp doesn't exceed 55C on anything i've done (heavy gaming). Case is open currently and has 2 fans and several ventilation openings all over it. Graphics card is hot to the touch, but I cant think of any way to cool it better.... My specs are : Gigabyte GA-H55M-USB3 rev 2.0 bios-F11 Intel Core i5-655k 3.2gh (not overclocked currently) ( 2 physical cores, 4 virtual, core 1 temp : roughly 26C core 2 temp : roughly 32C at idle ) Cooler Master Hyper N520 CPU Cooler Diablotek PSDA600 DA Series 600W Power Supply 8gb (2x4gb at 1333) Radeon HD 6950 2gb (flashed to 6970) OS: Windows 7, Ubuntu Linux 10.10, OSX Snow Leopard 10.6.6 win7/unbuntu on HDD 1, OSX on HDD2. One Final Thought: I've heard Wow and minecraft (the two games I use most) are CPU-dependent, and not so much GPU dependant. Could it be that Age of Empires Online is Graphic card-optimized, putting more stress on the GC and it's overheating causing the mobo to cut off?