Rank: Guru
Rating: 86%, 759 votes
Usually when this happens the most common cause is a graphics overheating error. When gaming you should always up the fan speed for your graphics card using the software that came with your card or software like rivatuner for Nvidia based cards or ATI Tools for an ATI based card. Also make sure you use a can of compressed air every now and again to clean out your vents, fans and case. Hope this helps.