Memory module and storage system suitable for a high speed operation

To be inserted into any one of fittings memory module, which are formed on a main board, which module comprises the following: a memory chip; a terminal pin to be connected to the connector; a bus for connecting the memory chips to the connector pin; a terminating resistor connected to one end of the bus, and a stub resistor (stub resistor) which is connected between the terminal pin and the other end of the bus, characterized, in that the connecting pieces to a memory controller in a manner of a stub connection (connection stub) are connected, wherein the stub resistor and the terminating resistor each have a stub resistance Rs, and a termination resistance value Rterm, wherein the stub resistance Rs, and the termination resistance value Rterm are given by: Rs = (N - 1) × Zeffdimm / N, and Rterm = Zeffdimm where N represents the number of connecting pieces; and Zeffdimm an effective impedance of a memory chip array, which consists of the bus and the memory chip, ...