Using what I had for the HWBOT OC Challenge December 2010, Stage 5 Socket 939.

Motherboard is a Biostar 6100 M9 and CPU is AMD 4200+ Dual Core.
I was stuck for a long time at 226 Buss Speed at this motherboard had pretty limited OC ability.

Digging deep in the interwebs I finally found a BIOS that made so I could raise that to 250.

Tweaking this more and more I was able to get a CPUz of 2.9ghz / 266 Buss.
Saddly tho after many, many attemps I had to lower the Buss speed to 254 to get this puppy to run 32M.

Was a lot of fun tho and I really enjoyed the comp !
Wish I could have done better here.

http://www.hwbot.org/community/submission/1089805_