I have a 2000+ throughbred and while i was on my overclocking adventure I ran into a problem. As most of you know a 2000+ is rated at 1.66Ghz.... right now I have it at 1.72Ghz (166x10.5) And that seems to be as far as I can go. I got it up to 1.82Ghz, however when I get into the boot screen my computer reboots. Sooooo to fix that I up the voltage from 1.600 to 1.625. That worked until I tried to open 3Dmark....once I start testing my computer reboots.( I have no idea how memory timing has to do with it but it was set to aggresive, with both oced tests and i didnt see a diffrence) Hopfully one of my fellow pimpriggers have the answers I seek "Bends down and prays"

Time to "WHEEZ DA JUICE" pour on some more power to that CPU, It wilI help stabilize you during testing.
I have had my XP2400 up to 2443 with 2volts to my cpu. gets reeeealy warm on air though, bout 60c, so I don't try to run any heavy benchmarks till I get something better than my Zallman to cool her down. I usually leave it at 2.3 with 1.8 volts, and it never goes above 48c during games or benchmarks.
The memory timings may help if you loosen them up a bit, but I find no improvement in stability either way, I max out at 436FSB (218FSB x2 )with CL2 3 3 6 timings. Anything looser realy doesn't help me, I have lotsa headroom with my DDR500

What motherboard and ram are you using? If you have an Nforce board and pc3200 or better, you can drop the multipler to 9 and go to 200fsb for 1.8ghz.
Turn off all background programs in MS config that you don't need, like automatic updates and messenger service, things like that are running in the background all the time and hog CPU and memory time, and can make it unstable during testing
A fresh install of windows along with all the updates for it, and update all your drivers, and defrag will make sure there are no "Ghosts in the machine" and gain ya a few points too

*Warning* You may damage any processor by turning the voltage above stock settings.
That being said,If you turn up the voltage to 1.65-1.7 that should take care of it, just watch your temps, (get a free program like Motherboard Monitor) under 50c is the general rule for long term CPU health

What board and what kinda ram you runnin?

my xp 2000+ runs 2.1ghz stable, no prob, 10.5x200fsb.