I think that poser doesnt uses two processors... dont know... check curiouslabs i think i saw that in there... besides i will wait until the release to the public of the new 64 bits machines. If you can wait, Intel should make a best perfomance with rendering (at least in 3ds it does) but i dont know if poser is optimiced for intel or amd. Any good motherboard like Asus, Gigabyte or MSI should give you good perfomance