[vee_ess]

They are both based on the same Palomino core, but they are meant for different applications. the XP will usually have a faster clock speed and is 32-bit. the MP will usually have a slower clock speed but i believe is 64-bit. the MP will be more powerful but does not support most current mobo's so you will need a new mobo.

the MP supports multi-processing also as it stands for multiprocessing platform

The AMD Athlon MP processor family is compatible with more than 60,000 software applications, including the latest 3DNow! Professional and MMX™ technology-enhanced software. To assist seamless integration into the enterprise environment, AMD has partnered with industry-leading hardware and software companies. AMD also conducts its own rigorous processor validation to ensure comprehensive compatibility. Systems based on this platform are available immediately from industry-leading OEMs worldwide.