Savage 4 GT/LX Chipset Mainboard/Quake 3

Small problem with Quake 3.
It crashes after five minutes of game play.
I have tried all types of drivers for this card including S3’s ref drivers and Diamond’s SIII S540 drivers. I have upgraded OpenGL drivers, and troubleshooted anything I could think of. Do you think that it could be my processor not being able to handle Quake 3 (PII-266)? Please get back to me as soon as you can. (