This happens to me when my CPU is under load, so I would check out what's going on in your task manager.
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MB: Gigabyte P35-DS3L
CPU: Core 2 Duo E6550 @3.5hz
GPU: PNY GeForce 8800 GT 512
RAM: 4GBs DDR2-800 (Ballistix and OCZ SLI) CL4
PSU: Antec NeoPower 650W
Case: Antec 900
HDD: Seagate SATA 250GB. 7200RPM. 16MB cache
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