Hii guys I am using cooler master k281 cabinet with 600watt power supply. I have 2 gb nvidia gtx 660ti grpahic card. And fx octa core processor. 8 gb ram 1tb hard disk. When I play high end games my pc shuts down in few minutes otherwise its working just fine. Is this due toh my heating problem or its power supply problem. If its heat problem what fan I should use to replace stock fan on CPU.