Circuit board of graphics processing unit and server system

A server system, comprising:

• a central processing unit set, a circuit board of a graphics processing unit and a graphics processing unit set, wherein the circuit board of the graphics processing unit is connected between the central processing unit set and the graphics processing unit set;
• a connector set, a switch chip set and a device slot set are deployed on the circuit board of the graphics processing unit, wherein the connector set comprises a first connector, a second connector, a third connector, and a fourth connector, the switch chip set comprises a first switch chip and a second switch chip, and the device slot set comprises a first slot set and a second slot set, wherein the first slot set comprises (M+P) device slots, and the second slot set comprises N device slots, N is equal to (M+P);
• the first switch chip is connected to the first connector, the third connector, and M device slots in the first slot set via traces of circuit board respectively, the second switch chip is connected to the fourth connector and the N device slots in the second slot set via the traces of circuit board respectively, and the second connector is connected to P device slots in the first slot set via the traces of the circuit board;
• the first connector is configured to be connected to a first central processing unit in the central processing unit set;
• the second connector is configured to be connected to the third connector;
• the third connector is configured to be connected to the second connector or the fourth connector;
• the fourth connector is configured to be connected to the third connector or a second central processing unit in the central processing unit set;
• and
• the device slot set is configured to be connected to a graphics processing unit in the graphics processing unit set;
• wherein the second connector, the third connector and the fourth connector are all board-to-board connectors, the second connector, the third connector and the fourth connector are arranged in a straight line, and face a same direction, and a distance between the second connector and the third connector, and a distance between the third connector and the fourth connector are both a target distance.