HP ProLiant SL250s Gen8 User Manual page 56

Connect the Mini-SAS cable from the option kit to the storage controller.
10.
Install the PCI riser cage (on page 24).
11.
Install the front GPU bracket (on page 20).
12.
Install the interposer board (on page 19).
13.
Install the front GPU cage (on page 17).
14.
Install the SFF hot-plug drive cage
15.
Disconnect the existing Mini-SAS cable from the drive cage.
16.
("Installing the SFF hot-plug drive cage" on page 23).
Hardware options installation 56