I think Ultra is right...
333 divided by 66mhz = 5 (multiplier)
check your bios, when system is booting at 333, FSB should = 66, and Multiplier should = 5
I bet you system is booting at 66 mhz, celeron style...lol
If this is true, then 5 is the multiplier, and the CPU is a 667, like Ultra says, just change FSB to 133..
Just trying to remember if this board has AGP & PCI setting for 133, I'm not sure.. if it doesn't then you'll be overclocking both of those bus's also... if no 133 setting, the AGP Bus = 2/3 133 = 87; the PCI Bus = 1/3 133 = 43.... if your AGP video can run at 87, and your PCI devices can run at 43 you'll be OK
I beleive the highest multiplier originaly supported on that M/B was 8X, but I bet it will go higher