Step 2.  Install the riser card and secure it to the bracket. 
Figure 92. Riser card installation
1.  Align the screw holes in the riser card with the corresponding ones in the bracket.
2.  Install the two screws to secure the riser card to the bracket.
Step 3.  If necessary, reinstall the PCIe adapters on the riser card. See 
“Install a PCIe adapter” on page 94. 
Then, refer to your note to reconnect any cables of the PCIe adapters on the riser card. Or you can 
refer to the 
Chapter 6 “Internal cable routing” on page 157 and locate the cable routing information 
for your configuration options.
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ThinkSystem SR645 V3 User Guide