Memory modules such as SIMMs and DIMMs are automatically tested by a target-system motherboard such as a PC motherboard. An automated SIMM/DIMM handler is connected to a handler adaptor board that is mounted to the back or solder-side of the PC motherboard. The relatively flat surface of the solder-side of the PC motherboard allows close mounting of the handler. One or more of the SIMM sockets on the motherboard is removed to provide mounting holes for the handler adaptor board. The handler adaptor board provides electrical connection from the module-under-test (MUT) in the handler to the removed SIMM socket on the PC motherboard. The handler adaptor board provides a slight spacing or offset from the solder-side surface of the PC motherboard's substrate, allowing the handler to be plugged directly into tester-connectors on the handler adaptor board. Since the offset of the adaptor board is slight, the length of electrical connections to the handler is short, minimizing the load on the PC's memory bus. A handler controller card that controls the handler is plugged into the PCI or ISA bus on the PC motherboard. Power to the handler adaptor board is cut when a new module is moved into position in the handler, reducing memory-bus upset.