HP 273914-B21 - Smart Array 6404/256 RAID Controller User Manual page 21

Press firmly on the back of the expansion module to seat the expansion module connector securely in
2.
the socket on the controller board (3).
Secure the expansion module to the controller board by inserting and tightening the appropriate
3.
screw (provided in the kit) in the back of the controller board (4).
To remove the expansion module, reverse this procedure.
Upgrading or replacing controller options 21