The CS-Storm 500NX 1U midplane board connects the GPU SXM board to the motherboard. The midplane mounts to the fan-power supply cage in the back of the chassis. To access the midplane, the fan-power supply cage must be removed from the back of the server chassis.
The figure shows all connectors on the front side of the midplane.Figure: Midplane - CS-Storm 500NX 1U Server