A processor module socket accommodates processor modules of different sizes with adapters that align smaller-sized modules so that module pins align with desired contact points. The largest supported processor module engages with the socket in a conventional manner without the use of an adapter. Smaller processor modules engage within an adapter that in turn engages in the socket in a manner similar to the largest supported processor module. The contact points of the socket support different sized processor modules by keying logical functions based upon the type of processor module installed in the socket.