[citation][nom]impulse fire911[/nom]to answer some of your question i dont think heat was too much of a problem and no mac pros dont have 16 threads, they have 8 threads because the xeons only have 1 thread per core, the only cpu tht has 8 threads on 4 physical cores is the core i7, and a mac pro with 8 cores costs around 5000 so yeahh....[/citation]
The Xeons have 8/16 threads since they use hyperthreading. They have 2 threads per core. The 8 core Mac Pro has 16 virtual processors and the 4 core Mac Pro has 8 virtual processors, as does the Core i7 iMac. The Core i5 iMac, however, does not have hyperthreading and so only hs 4 virtual processors.