Judging by the 66, I'd guess it's something like 66/33/200...
The 66/33 are AGP frequency and PCI frequency, respectively. When you overclock and you don't lock the AGP and PCI frequencies, both speed ratings will increase, and it's not really a good idea to run your AGP and PCI speeds out of spec.
Just make sure you lock the AGP/PCI buses before you overclock.
You really should read your manual and do some research before you ever even think about trying to overclock lol. I swear so many overclocking noobs get theirselves into so much confusion just cause they want to overclock first and ask questions later .
I'll never forget the kid in MaximumPC that overclocked his Athlon XP with a 13.5 multi to 200Mhz FSB lmao.