P3 Dual Motherboard

I know that at least a couple of you dopers are computer whizzes. I’m looking to get a second P3 processor and buy a dual processor motherboard to improve my computer’s speed. Yes, I do know that I need to have an operating system other than WIn 9x to actually support the dual processors. Can any of you recommend a board that would work for me and allow some overclocking potential as well?