Superconducting technologies machines are characterized by dramatic disparity between C.P.U. and memory performance. The PIM architecture has good memory access for problems where the data can be laid out geometrically in a fashion (probably two dimensional) that matches the machine. The PIM architecture only has modest memory per CPU (which can be increased by using less than 50% of the silicon real estate for C.P.U.) which suggests it may need to be integrated with conventional (class A) nodes to handle sophisticated operating system functionality. This makes PIM machines like ``attached processors'' but with very flexible C.P.U.'s.