Server models with four 3.5-inch rear drive bays and two PCIe slots
Table 17.  Components on the rear of the server
Callout Callout
1  3.5-inch rear drive bays (4) 2  PCIe slot 3 (on riser 1 assembly) 
3  PCIe slot 6 (on riser 2 assembly) 
4  Power supply 1 
5  Power supply 2 (optional) 
6  NMI button
7  USB 3.1 Gen 1 connector 8  VGA connector 
9  USB 3.1 Gen 1 connectors (2)  10  XClarity Controller Network connector
11  Ethernet connectors on OCP 3.0 Ethernet adapter 
(optional, two or four connectors may be available)
Note: For more information about each component, see “Rear components overview” on page 39.
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ThinkSystem SR665 Maintenance Manual