Patent ID: 8422245

Claim:
A motherboard comprising: a main circuit board having a first holding surface and a side surface connected to the first holding surface; a first CPU socket positioned on the first holding surface; a first memory socket positioned on the first holding surface and electrically connected to the first CPU socket; and a first interface positioned on the first side surface, electrically connected to the first CPU socket, and configured for providing a connection between the main circuit board and a sub-circuit board; wherein the sub-circuit board has a second holding surface and a second side surface formed adjacent to the second holding surface, the main circuit board defines an indentation matching with the sub-circuit board, and the sub-circuit board comprises: a second CPU socket positioned on the second holding surface; a second memory socket positioned on the second holding surface, and electrically connected to the second CPU socket; and a second interface positioned on the second side surface, electrically connected to the second CPU socket and the second memory socket, and coupled to the first interface to establish communication between the sub-circuit board and the main circuit board.