Rear view with two 3.5-inch rear drive bays and four PCIe slots
Table 17.  Components on the rear of the server
Callout Callout
1  PCIe slot 1 (on riser 1 assembly) 2  PCIe slot 2 (on riser 1 assembly)
3  PCIe slot 3 (on riser 1 assembly) 4  PCIe slot 6 (on riser 2 assembly)
5  3.5-inch rear drive bays (2)
6  Power supply 1
7  Power supply 2 (optional)
8  NMI button
9  USB 3 (5 Gbps) connector (DCI) 10  VGA connector
11  USB 3 (5 Gbps) connectors (DCIs) 12  XClarity Controller Network connector
13  Ethernet connectors on OCP 3.0 Ethernet adapter 
(optional)
Note: For more information about each component, see “Rear components overview” on page 50.
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ThinkSystem SR650 V2Maintenance Manual