jheronimus wrote on 2021-03-07, 21:52:

I'm using Pentium 3 11x100 (SL5QW) in my Chaintech 6BTM0. That's a 440BX board as well, only full-ATX. I've found a modded BIOS with support for Tualatin which also added support for my SL5QW. Could be something similar available for your board as well?

You can patch the BIOS yourself with BP 4.23 and few other files for it (CBROM etc), there is how to article on rom.by site. It adds many nice to have fixes (like big HDD support etc).