VIA CPUs
From Vogons Wiki
VIA Cyrix III/VIA C3
The VIA Cyrix III (later called the VIA C3) is a Socket 370 compatible processor designed by the Centaur team that built the various WinChip CPUs. It is not competitive with Intel Celeron unless run at a much higher relative clock speed.
Several core revisions were made and figuring out what exact CPU one has in hand is a task in itself. VIA has a list of compatible motherboards on their website, though it doesn't list which cores are compatible with what motherboard.