IBM x3650 M3 Installation And User Manual page 88

Figure 64. SAS controller remova
Figure 65. SAS controller front retention bracket removal
10. Connect one end of the internal power cable that comes with the 8 Pac HDD
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System x3650 M3 Types 4255, 7945, and 7949: Installation and User's Guide
9. Remove the SAS controller front retention bracket from the server.
option kit into the empty hot-swap SAS/SATA power connector on the system
board.