Hypothetical question here. Suppose we have a quad-core 2.93GHz Mac Pro and an eight-core 2.93GHz Mac Pro. Suppose the machines are otherwise configured the same, i.e., identical hard drives, identical graphics cards, identical RAM configuration such as 4x2GB, identical operating system. Would the performance of these machines be equivalent for all programs that use four cores or less? For all tasks that don't use multithreading?