I present to you, fellow readers of this blog, the soon-to-be second fastest student owned computer on MIT campus:
The beginning of an ultimate case mod for the ultimate hackintosh
Two Intel Xeon X5650 @ 4.0GHz
24GiB DDR3-1600 RAM
Two AMD Radeon HD 6870
 The fastest will most certainly be this baby, if not for beefier GPU hardware then the soon-to-be liquid nitrogen pots sitting on top of the dual hexes. I also need to mention Cyril Lan's rig, which is powered by a 2500K @ 4.8GHz with dual AMD Radeon HD 7970s, but for most nonspecialized applications, CPUs dominate, sadly.