http://www.pc-tweaker.ch/Downloads/BiosMainboard.htm

here is the link that you have complete collection of tictacs and merlins bioses.
I had D22 bios and I goes at 250FSB and that's it. CPU o/c also near 2500MHz. When I put one of these bioses I get 265FSB and 2,7GHz CPU!
I've tryed only couple , if someone find better one just post it , or send on PM.