Abstract: A high-density computer system comprises: a chassis, having a main backplane, and a main control circuit and a plurality of main backplane slots installed and formed on the main backplane respectively; at least one expansion card module inserted and installed in the chassis, and the expansion card module includes a sub-backplane having a sub-control circuit and a plurality of second sub-backplane slots, and an end of the sub-backplane has a first sub-backplane slot corresponding to the main backplane slot, and the first sub-backplane slot and the sub-control circuit and the second sub-backplane slots being electrically coupled; a plurality of CPU cards installed on the expansion card module, each being inserted to the second sub-backplane slot, and the CPU card having a CPU, such that the computer system can have a powerful modular assembling function to enhance the economic benefits and product competitiveness.

Abstract: A quick circuit board press-mount device comprises: a positioning device, having a positioning board and a back board, and the positioning board having an adjusting knob with a screw rod portion, and the back board having an adjusting notch; an adjusting device, having a combining board, an insert board extended forward from the front end of the combining board, and the insert board having a screw hole for securing the screw rod portion, and the insert board being inserted into the adjusting notch, and the insert board having a lateral connecting board extended from a side from the combining board, and the lateral connecting board having an oblong adjusting slot for securing a position screw hole of the back board by a screw rod; and a press-mount element, coupled to the combining board, so that the circuit board module and the interface card can be mounted conveniently and quickly.

Abstract: A high-density computer system comprises: a chassis, having a main backplane, and a main control circuit and a plurality of main backplane slots installed and formed on the main backplane respectively; at least one expansion card module inserted and installed in the chassis, and the expansion card module includes a sub-backplane having a sub-control circuit and a plurality of second sub-backplane slots, and an end of the sub-backplane has a first sub-backplane slot corresponding to the main backplane slot, and the first sub-backplane slot and the sub-control circuit and the second sub-backplane slots being electrically coupled; a plurality of CPU cards installed on the expansion card module, each being inserted to the second sub-backplane slot, and the CPU card having a CPU, such that the computer system can have a powerful modular assembling function to enhance the economic benefits and product competitiveness.