I've got a contender:
A PIII-1000Mhz processor o/c'd to 1.1 Ghz.
It's stuffed in a Compaq Deskpro Micro-atx case if you can believe it.
Sandra 2001 CPU benchmark scores:
ALU - 2941
FPU - 1464
I thought this looked pretty good compared to the (lower) P4 1.5 scores in the benchmark comparison.
Has anyone else bumped up a P3 to P4 killing levels?