overclocking kt133a with and xp2100

Hello,
i have this motherboard and a amd xp 2100, by default it is works at 2000
mhz, 100 Mhz fsb and very stable. The problem is that i have a msi ti4200,
and the system has becomes very inestable, reboot every 4 minutes, with the
gforce2 work very fine. I try with the old amd xp 1600, and there is no
problem with both graphics cards. Any idea? how i can get this processor
work with nominal speed (1733 mHZ)? How i can get 133Mhz fsb? any advice to
get more stable system?
Thanks in advance.