A solderable circuit board module system includes at least a first solderable circuit board module and a second solderable circuit board module, wherein the first solderable circuit board module has a first module circuit board having a top side and an underside provided for placement on a motherboard, wherein on the underside of the first module circuit board, solder connection contacts are arranged in a first frame-shaped contact region around a central middle section, which is free of connection contacts. The second solderable circuit board module has additional solder connection contacts, which form an outer frame around the first frame-shaped contact region, as a second group.