Well since you can dual boot Mac's .. this might be of some interest

8-core Mac Pro

Appearing this morning on Apple.com was the refresh of the company's most powerful desktop class computer, the Mac Pro. The new tower comes with either dual quad-core CPUs (for a total of eight cores) or dual, dual-core CPUs (for a total of four):

Opt for the 8-core Mac Pro and you get the power of two Quad-Core Intel Xeon "Clovertown" processors running at 3.0GHz. Or choose a quad-core Mac Pro featuring two Dual-Core Intel Xeon "Woodcrest" processors and decide how fast they fly: 2.0GHz, 2.66GHz, or 3.0GHz. At 3.0GHz, the quad-core Mac Pro runs up to 2x faster than the Power Mac G5 Quad.