More likely to be an overheating video card than an overheating CPU. Many people never clean the small fan on their video card. Perhaps also your case does not have adequate airflow. Take a look at it and see if itโs filthy or not. Also, if a game is almost too much for a particular video card, it will slowly heat up untill it causes the game to crash or system to lock up. This is more common with video cards that have low vid memory is low - 32-64 mb. Check the BIOS and make sure that your Gaphics Apeture is set to 1/2 the amount of RAM in the machine. Itmay be set to at 64mb, which is default for most BIOSโs. This may not be the case, but it might be for all I know with what little info you have provided. Which video card are you using?
The following BIOS settings will provide optimal performance for most video cards.
Assign IRQ for VGA: Enable
PnP O/S Installed: Enable
VGA Pallet Snooping: Disable
PCI Bursting: Disable
PCI Latency Timer: 128
Video BIOS Shadowing:Disable
Video BIOS Cacheable: Disable
Video RAM Shadowing: Disable
Video RAM Cacheable: Disable
USWC Options: Disable (or set to UC)
Pipeline Cache Write: Disable
PCI 2.1 Compliancy: Enable
Passive Release: Enable
Delayed Transaction: Enable
VGA Boot Sequence: AGP or PCI (Based on the installed card)
AGP/Graphics Aperture Size: รยฝ the amount of installed system memory
AGP Turbo Read Mode:Disable
AGP Turbo Write Mode:Disable
AGP WS Write: Highest Possible Value
AGP WS Read: Highest Possible Value
AGP Transfer Mode: 4x (or the highest setting available)
AGP Clock:2/3
AGP Aperture: รยฝ the installed RAM (Example: 256 RAM รขโฌโ Set Aperture to 128)
Video BIOS Shadow: Disabled
Video BIOS Cacheable: Disabled
Video RAM Cacheable: Disabled
C8000-xxxxx-Cacheable: Disabled
Peer Concurrency: Enabled