A typical neutron star, no more than 15 km in diameter but as massive as a star
Also called a neuron star, this is an archailect based upon a computational substrate comparable in mass, size, and density to a neutron star, no more than 4X1030 kilograms (2 solar masses). The computronium basis generally consists of exotic, highly dense materials such as such as magmatter, although more exotic quarkonium components may be involved. Such complexity is often considered to be the bare minimum housing for an archailect at the full S5 rating.
Omegon - Text by Vic Stenger in Omega Point Theory List and Transhuman terminology An intelligence turning itself into a neutron star, black hole or even a baby-universe in order to increase its computing speed or to evolve towards a Omega Point.