I looked for it , but I didn't see it anywhere , Hmm.
Anyway, there shouldn't be any difference at all between a Dual XP versus Dual MP if they are running clock for clock.
The new chipset from AMD will not support XP CPU's now, so keep that in mind.
<< MPX motherboards are not allowing XP processors to run on these systems as the motherboard identifies the processor as an XP and not MP. >>