I unlocked my new XP 1800 awhile ago when I built it and just now decided to do some OCing. First I underclocked it to 1Mhz and tried booting up...No problems, MB posted and XP booted up fine. Then I tried the lowering the multiplier to ten and increasing the FSB to 166. The MB posted fine and XP started the boot process, however just before giving me a logon screen my system rebooted without loading XP. WTF! I tried various other multiplier, FSB, Vcore settings and still could not get XP to boot. It just keeps on restarting without loading XP. Here's my system specs:
AMD XP 1800 unlocked
Asus A7V333R Bios Ver. 8 (I think that the right BIOS)
768 MB true DDR333 Samsung memory
WD 80 GB w/8MB cache HD
Gainward Ge4 Ti4200w/128MB RAM
Thermalright AX-7 HS w/Vantec Tornado Fan
I think that MS XP may put a Max limit on the CPU speed in the Hardware config., but Im not sure.
Please Help guys. My system otherwise is very stable with no problems.