EV6 requires eachcpu to have its own path to the northbridge, which makes it to get the same bandwith as in a single cpu situation, hile intel dual chips share the bandwith, but this path to the northbridge (ram) adds pcb layers. please correct me if i'm wrong, cause im not very sure on the details. definetly only 1 northbridge, and the max number of cpus in setup if defined by chipset, thats im very sure. about power req. i want to know too, because when i will upgrade my p3-550@733, dual durons@1000 will sound really nice...