Make sure the CPU fan is plugged into the CPU_FAN1 header on your motherboard. The temperatures will slowly climb for a bit and level off, again load up Windows and download something like CoreTemp and see what your temperatures are when gaming. The CPU's maximum temp is 100C and it will start throttling in the 90's. For a stock cooler you will probably see 70-80c under a heavy load. Idle temperatures will be 30-40c (depending on room temperature)