Server unit comprising stacked multiple server unit cabinets accommodating multiple cartridge type server units

A server unit comprising multiple server unit cabinets stacked in a server unit rack, each said server unit cabinet accommodating multiple cartridge type server units,

• each said cartridge type server unit comprising:
• a printed circuit board for a server unit, which is equipped with a central processing unit and main memory and which serves as a computer with the supply of external electric power at constant voltage;
• a heat sink supported by the printed circuit board for the server unit;
• a front panel which supports the printed circuit board for the server unit;
• and
• an extension connector to which an extension board is connected provided on one surface of the printed circuit board for the server unit;
• wherein
• the front panel supports the printed circuit board for the server unit so that a flat surface of the printed circuit board for the server unit is positioned vertically when the server unit is installed,
• a part of the heat sink makes contact with highly heat-generating components mounted on the printed circuit board for the server unit via heat conduction means,
• the heat conduction means are provided to transmit heat from said contacting part to another part of the heat sink, and
• each said server unit cabinet for accommodating multiple cartridge type server units and a constant-voltage power source comprising:
• a server unit space for accommodating said multiple server units;
• a power source space for mounting at least one said constant-voltage power source;
• a signal transmission space for accommodating signal transmission means;
• and
• a cooling space for accommodating cooling means;
• wherein
• said server unit cabinet is equipped with a server unit connector having a signal input/output terminal and a constant-voltage outlet terminal, and with a power connector having a signal input/output point, an external power inlet terminal, and a constant-voltage power inlet terminal;
• and that said server unit cabinet provides;
• (a) a wiring circuit board which includes wiring between the constant-voltage inlet terminal of the power connector and the constant-voltage outlet terminal of the server unit connector, and wiring between the signal input/output terminal of the server unit connector and the signal input/output point,
• (b) an external signal input/output connector provided on the front of the server unit cabinet, and
• (c) a signal transmission means which connects between said external signal input/output connector and the signal input/output point of said wiring circuit board.