It's not certain if there's going to be different DCPUs with different specs. Notch has said[1] that there's definitely going to be versions with different clock rates floating around in space or on abandoned spaceships.
[1] http://vps.thomascomputerindustries.com/logs/freenode/0x10c-... (search for "[11:38:45]")
> [11:39:56] <_notch> fly in highly radiated areas, and random bits in ram will flip
Everything I hear about this game makes me want it more and more.
Explore the planet, fight off hordes of zombies to obtain... a DCPU16 - REV C!