Lots of stuff will just plug in and chain off. So performance is not going to be bettered over Thunderbolt. One Rev2 PCIe slot is still several times the throughput of an entire Thunderbolt bus. And the only thing you accomplish is you put the SATA/SAS/RAID chipset inside the enclosure instead of inside your MacPro in a PCIe slot. It will cost more since you are also adding those fancy new Thunderbolt chips at both ends. Thunderbolt is just PCIe over a cable - you still need the SATA/SAS/Fiber or whatever chipset at the other end along with a Thunderbolt bridge chip. Cheaper because PCIe cards are mature and very common. For the most part, external storage on a PCIe equipped MacPro will still be cheaper and better performing using your regular PCIe attached SATA/SAS RAID or HBA card than you can get with Thunderbolt RAID/storage devices.
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