The release notes at build 121 have some interesting comments about cpu speed, and clock-locked-ness. Build 115 also talks about other board revisions.
The history also has an awful lot of things along the lines of 'fix for P3 rev a3 detection speed with other processor'; you may wanna complain to Intel. (ha ha ha!)
Yeah, I read all that, uh, "interesting" text. But the fact remains that builds 133 and 132 are the only ones I can actually find anywhere.