Though this is slightly older technology, here is what I did
I bought 2 different Athlon XP Mobile 2800's on ebay from 2 different people at 2 different times. Stuck them in my Tyan Tiger MPX board with a pin mod to lock the multipliers (XP-M's have unlocked multipliers and default to the lowest one).
System has been rock solid stable for over a year, and I crunch SETI on it 24x7 along with gaming, etc...
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ComputerBB