IBM System x3400 Type 7975 Installation Manual page 44

10. Rotate the front and rear adapter-retention brackets to the closed (locked)
If you have other options to install or remove, do so now; otherwise, go to
"Completing the installation" on page 31.
30
System x3400 Types 7973, 7974, 7975, and 7976: Installation Guide
Adapter guide
8. Carefully grasp the adapter by the top edge or upper corners, and align it with
the expansion slot guides; then, press the adapter firmly into the expansion
slot. Move the adapter directly from the static-protective package to the
expansion slot.
Note: If any adapters in the server are large or have heavy cables attached to
them, you can remove the rear adapter-retention bracket and secure all
of the adapters with expansion-slot screws (the expansion-slot screws
are located on the side of the optical drive cage).
Rear adapter
retention bracket
Adapter
Front adapter
retention bracket
9. Connect required cables to the adapter. Route cables so that they do not block
the flow of air from the fans.
position.