Lenovo ThinkSystem SR665 Maintenance Manual page 46

Server models with eight 2.5-inch rear drive bays and four PCIe slots
Table 15. Components on the rear of the server
Callout
PCIe slot 1 (on riser 1 assembly)
1
PCIe slot 3 (on riser 1 assembly)
3
2.5-inch rear drive bays (8)
5
Power supply 2 (optional)
7
USB 3.1 Gen 1 connector
9
USB 3.1 Gen 1 connectors (2)
11
Ethernet connectors on OCP 3.0 Ethernet adapter
13
(optional, two or four connectors may be available)
Note: For more information about each component, see "Rear components overview" on page 39.
ThinkSystem SR665 Maintenance Manual
36
Callout
PCIe slot 2 (on riser 1 assembly)
2
PCIe slot 6 (on riser 2 assembly)
4
Power supply 1
6
NMI button
8
VGA connector
10
XClarity Controller Network connector
12