Abstract: A circuit board assembly includes a circuit board, at least one metal sheet, at least one bus and at least one fixed member. The circuit board has at least one electrical connecting area. The metal sheet is adapted to solder to the electrical connecting area and has at least one metal sheet hole. The bus has a connecting portion. The connecting portion is corresponding to the metal sheet. The bus has at least one fixed screwing hole. The fixed screwing hole is corresponding to the metal sheet hole. The circuit board and the bus is locked by the fixed member.

Abstract: A server adapted to a server rack. The server rack has a first and a second connectors at a rear end of the server rack. The server comprises a tray, a motherboard, an expansion board, an adaption board, a system board, a docking module and a first cable. The motherboard comprises a central processing unit. The motherboard, the expansion, the adaption board and the system board are disposed on the tray. The docking module comprises a third and a fourth connectors. The fourth connector is configured for electrically connected to the first connector, and the third connector is configured for electrically connected to the second connector. One end of the first cable is connected to one end of the third connector, and the other end of the first cable is connected to the adaption board. The first cable is electrically connected to the third connector and the adaption board.

Abstract: A circuit board assembly includes a circuit board, at least one metal sheet, at least one bus and at least one fixed member. The circuit board has at least one electrical connecting area. The metal sheet is adapted to solder to the electrical connecting area and has at least one metal sheet hole. The bus has a connecting portion. The connecting portion is corresponding to the metal sheet. The bus has at least one fixed screwing hole. The fixed screwing hole is corresponding to the metal sheet hole. The circuit board and the bus is locked by the fixed member.