Intel SRCSASRB - RAID Controller Hardware User's Manual page 12

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Figure 2. Installing the Intel RAID Controller SRCSASRB
5. For the first four drives, ports 0 - 3, connect one 4-port combined end of an internal
cables to the upper connector. If you are using more than four drives without using
an expander backplane, connect the second cable to the lower connector. See the
following figure.
To prevent throughput problems, use the cables provided or use the shortest
possible cable. Do not use cables longer than one meter. Decrease the maximum
length by one foot if using a backplane. Do not use cross-over cables. Only connect
to a SATA drive, SAS or SATA backplane, or an expander device. Route the cables
carefully. Check that controller and cables are all properly attached.
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7 Intel RAID Controller SRCSASRB Hardware User's Guide