i have a duron 600. i have a fop38 hsf. its now overclocked to 800 with default vcore voltage. i tried upping the vcore voltage to 1.75, it worked, but still no 900. then i tried 1.80, and it was a no go. neither was 1.85. i can change it to 1.80/5 but when it tries to reboot, it doesn't. it doesn't reboot at all. its just like there is no chip in the socket when i reboot. i have to do a powerdown, then wait a few seconds, then re power up. anyone with any info would be greatly appreciated, thanks!