Originally posted by NeoStrider
you can't use a single and a dual together because motherboard manufacturers make it work that way. maya can work with dual processors, but you need to make sure that you have a dual-processor motherboard first... and from what i've seen, they don't make them for dual-core processors yet... (or i'd have had my hands on one... i've got an eye out for them 
)
They do have dual processor, dual core boards, they've been about for a bit e.g Dual Opteron dual core boards for one (check Boxx out for PC's equiped with them.
They now have the new Dual Xeon dual coire boards available running hte new Inter core 2 duo chips, they should be fast! (Supermicro X7DAE reviewed in 3D world)
"No pressure, no diamonds" Thomas Carlyle