A server includes a base circuit board (31) having opposite first and second surfaces (311, 312), multiple spaced-apart first connectors (32) disposed on the first surface (311) and electrically connected to the circuit board (31), multiple second connectors (33) disposed on the second surface (312) and each disposed between adjacent two of the first connectors (32) and electrically connected to the base circuit board (31), multiple storage modules (1) each electrically connected to a corresponding one of the first connectors (32), and multiple controllers (204) each electrically connected to a corresponding one of the second connectors (33) and being operable to control a corresponding one of the storage modules (1).