The P54C pentiums are NOT MMX. The P55C Pentium MMXs are dual voltage, and it sounds like this motherboard won't support them. I think all of the retail places are only offering the 233MMX as their bottom end pentium right now. A place called Compgeeks (www.compgeeks.com) has the 166 and 200 mhz non-MMX chips, but I'm sure you can get one cheaper somplace else.
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