Does anyone know exactly when they locked the clock and fsb speeds? Here, you're saying it was week 34 1998, but the Maintenance & Service Guide for Compaq Deskpro EP series (I have it on pdf) says it was 1st January 1999 for all 300mhz and faster Pentiums and Celerons.
1. Intel never locked the FSB speeds, the processor just indicates the intended FSB speed. Mainboards by default use this recommendation, though many retail mainboards allow you to set differing FSB speeds, like mainboards from Abit, Asus, Aopen, Soyo, MSI etc.
2. I know for a fact that the mid/late 1998 celeron 300 I have here is fully multiplier locked, so the service guide is wrong already. What is in the the second post of this topic is the best I can say with the information that I have. If you want to read the background follow the link there.
I intent to try a klamath, but I will be going abroad next week already... so me should either hurry or postpone it. I have this Aopen mainboard with a 1.5x multiplier option, maybe it works for klamath CPU's.
Fortunately UX-3 beat me to it, it says in german that the klamath does not respond to multiplier 1.5x:
Pentium II als DOS- & 3dfx-PC