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Add up to 2 x eSATA ports by using additional Mac Pro SATA Channels.
MAXPower 4-Port USB 3.1 Gen 1 PCIe Controller Card
The NewerTech MAXPower eSATA 6G Pro PCIe Controller Card is like a "performance assurance policy" as conventional hard disk drives and SSDs migrate to the SATA 6Gb/s standard.