someone allready asked this exact same question, barely a day ago, on this forum page!
here we go again.
the MP is guaranteed by AMD to work in dual procesor systems. if they dont, u can get a replacment.
Most XP chips also seem to work as dual cpu's, but if they dont, TOUGH LUCK.
Overclocked athlon 1200C @ 8.5 x 166FSB + PC2700 = GOOD! :smile: