IBM System x3650 M3 4255 Installation And User Manual page 92

21. Remove the expansion-slot bracket that is screwed to the vertical wall above
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System x3650 M3 Types 4255, 7945, and 7949: Installation and User's Guide
d. From the other side of the SAS controller, insert and tighten the screw to
secure the interposer card to the SAS controller.
the power supply and install the expansion-slot bracket on the SAS controller:
a. Orient the SAS controller as shown in the illustration.
b. Align the metal bracket so that the tabs are on the back side of the SAS
controller and the holes on the tabs align with the holes on the SAS
controller.