System becomes unstable

Memory: 1024 GEIL DDR400 (2 ea. 512) CAS2.5-4-4-8
HDD: Maxtor 120 Gig SATA
CPU: 2.8 Gig @800 Mhz FSB
BIOS: 3.A0
I've noticed when I'm playing 3D games that my system performance will suddenly degrade to the point where the system is just short of being locked up. When this occurs, I can bring up Core Center and it shows my FSB and CPU speed jumping all over. The mouse cursor movement jumps around consistent with the system clock readings. A normal shutdown at this point will take up to 5 minutes. Once the system is rebooted it clears the problem until the next occurence. I've checked system temperature and the NB and CPU never raise above a reading of 116 F. I am not overclocking in any way. It's seems to occur with no specific frequency but most commonly when the system is under stress.
Any help would be appreciated

To me, I think it's your PSU causing the problems.
Here's some guides for your reference: Power Supply Guide P4 Neo Unofficial Guide Moan Guide

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