First up: 4.26 GHz, 2gigs of DDR2 667 RAM and most importantly, 2 x Dual NVIDIA 7800 GTX 512, also known as Quad SLI.
And Blowing away the former(but no one knows if it's real or not):
6.8GHz CPU (NOT overclocked) with 256MB incorporated memory(Yes that's MB), apparently up to 64GB of RAM and 2TB of Disk Space. The creator behind all this is a lone genius who's been popping up with ninja-level components for year but has yet to allow a hands on. This time at CES 2006 he showed this:
However, with approximately half the world calling bullshit, I'm going to reserve judgement.