Server for realizing flexible adaptation of external plug-in card

The utility model provides a server capable of realizing flexible adaptation of an external plug-in card. According to different customer requirements, the rear window is flexible and variable by combining two factors of mainboard bandwidth and structure, the OCP buckle cards and the PCIE adapter cards are flexibly matched according to whether the OCP buckle cards need to be matched or not, and when two OCP buckle cards need to be used, the two PCIE adapter cards with the X16 bandwidth are arranged above the OCP buckle cards; when one OCP buckle card needs to be used, a PCIE adapter card capable of supporting two X16 bandwidths and a PCIE adapter card supporting tiling on the other side are arranged above the OCP buckle card and used in cooperation. When the OCP buckle card does not need to be used, two tiled PCIE adapter cards are arranged; therefore, the flexible support of the external card is realized, the development cost of the server is reduced, and the product competitiveness is improved. 本实用新型提供了一种实现