SoftFSB does support your clock generator. It can be downloaded at <A HREF="http://www.tweakfiles.com/processor/softfsb.html" target="_new">http://www.tweakfiles.com/processor/softfsb.html</A>.
If it is a recent revision with recent BIOS, you should be able to increase your bus speed to 133 in BIOS (that's 266DDR BTW). You can also modify the multiplier manually.
You can download the bios at <A HREF="http://ftp://203.161.230.35/pub/bios/m810lmr/010425s.zip" target="_new">http://ftp://203.161.230.35/pub/bios/m810lmr/010425s.zip</A>
Cast not thine pearls before the swine