1. A managed sub-environment for a computer system, comprising: an electromagnetic interference (EMI) and thermal enclosure; an enclosure connector disposed on the enclosure, adapted to be engaged with a backplane connector of a computer system backplane; and a computer system device enclosed by the enclosure and coupled to the enclosure connector such that the computer system device is adapted to be coupled to the computer system backplane, the enclosure to isolate an EMI environment of the computer system device from EMI outside the enclosure.