6-Gb/s SATA and 5-GT/s bus

I am looking into building a set of machines each having 4 SATA 3 disks and an i5-3450S CPU. The disks are to be plugged into the motherboard on 6-Gb/s interfaces. The CPU has a 5-GT/s bus. I am having trouble mapping gigatransfers to gigabits in this setup to figure out how much of the disks' 6-Gb/s interfaces will be utilized at best.

Any pointers are appreciated.
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  1. The limiting factor is going to be the disks. Mechanical HDD will not even max out the max transfer rate of SATA II controller.
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