Make/model of motherboard would be helpful.
It's likely the A/B are for the higher transfer speed 6Gb/s SSD's (often called SATA III or SATA 3.0) and the other ports are likely 3Gb/s.
SATA 6Gb/s is backwards compatible with lower speed SATA drives.
Check the MB specs.
Don't know why there's missing numbers... unless they are hidden somewhere else on the board.
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