A memory module, adapted to be inserted to an interface card slot of a motherboard, the motherboard comprising a basic input/output system module, the interface card slot comprising a plurality of lighting mode control lines (L0-L2) connected to the basic input/output system module, the memory module comprising: a circuit substrate, comprising an insertion portion that extends to one side edge of the circuit substrate and is configured for insertion to the interface card slot; a plurality of lighting mode control pins (P0-P2), disposed in the insertion portion and respectively coupled to the corresponding lighting mode control lines (L0-L2); a plurality of light sources, disposed on the circuit substrate; and a lighting control circuit, disposed on the circuit substrate and receiving at least one lighting mode selection signal (SA0-SA2) through the lighting mode control pins (P0-P2) to control luminous characteristics of the light sources according to a lighting control mode selected by the at least one lighting mode selection signal (SA0-SA2), the memory module being characterized in that the interface card slot further comprises a power line, a clock signal line, and a data signal line, the clock signal line and the data signal line are connected to the basic input/output system module, and the memory module further comprises: a power pin, a clock pin, and a data pin that are disposed in the insertion portion and respectively configured to be electrically connected to the power line, the clock signal line, and the data signal line; and a power conversion circuit, disposed on the circuit substrate, receiving an input power from the interface card slot through the power pin and the power line, and converting the input power to an output power, the lighting control circuit receiving the output power from the power conversion circuit and receiving a clock signal and a control command from the interface card slot respectively through the clock pin and the data pin, the lighting control circuit further controlling the luminous characteristics of the light sources according to the lighting control mode selected corresponding to the clock signal and the control command. a circuit substrate, comprising an insertion portion that extends to one side edge of the circuit substrate and is configured for insertion to the interface card slot; a plurality of lighting mode control pins (P0-P2), disposed in the insertion portion and respectively coupled to the corresponding lighting mode control lines (L0-L2); a plurality of light sources, disposed on the circuit substrate; and a lighting control circuit, disposed on the circuit substrate and receiving at least one lighting mode selection signal (SA0-SA2) through the lighting mode control pins (P0-P2) to control luminous characteristics of the light sources according to a lighting control mode selected by the at least one lighting mode selection signal (SA0-SA2), the memory module being characterized in that the interface card slot further comprises a power line, a clock signal line, and a data signal line, the clock signal line and the data signal line are connected to the basic input/output system module, and the memory module further comprises: a power pin, a clock pin, and a data pin that are disposed in the insertion portion and respectively configured to be electrically connected to the power line, the clock signal line, and the data signal line; and a power conversion circuit, disposed on the circuit substrate, receiving an input power from the interface card slot through the power pin and the power line, and converting the input power to an output power, the lighting control circuit receiving the output power from the power conversion circuit and receiving a clock signal and a control command from the interface card slot respectively through the clock pin and the data pin, the lighting control circuit further controlling the luminous characteristics of the light sources according to the lighting control mode selected corresponding to the clock signal and the control command. a power pin, a clock pin, and a data pin that are disposed in the insertion portion and respectively configured to be electrically connected to the power line, the clock signal line, and the data signal line; and a power conversion circuit, disposed on the circuit substrate, receiving an input power from the interface card slot through the power pin and the power line, and converting the input power to an output power, the lighting control circuit receiving the output power from the power conversion circuit and receiving a clock signal and a control command from the interface card slot respectively through the clock pin and the data pin, the lighting control circuit further controlling the luminous characteristics of the light sources according to the lighting control mode selected corresponding to the clock signal and the control command.