Avago Technologies 3ware 9550SXU-4LP - Manual (Page 19)

Installing a 9550SX RAID Controller with Multilane Internal Connectors
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To connect the multilane cables and install the
controller in the computer
Depending on the number of drives you will be connecting, you
will connect one to three multilane cables (for the 12-port card) or
one to four multilane cables (for the 16-port card). Each cable
supports up to four serial ATA ports.
1 Connect each multilane cable to a multilane connector on the
controller.
When the cable is inserted correctly, you will feel it click into
place.
Figure 13. Connecting an InfiniBand Multilane Cable with an
SFF-8470 Connector to the 9550SX-12MI Controller
Figure 14. Connecting a Multilane Cable with an SFF-8087
Connector to the 9550SX-16ML Controller