The USB3 implementation in the 2013 Mac Pro is not native to the chipset and is handled by a separate controller chip*. Real-world speeds are always below theoretical. The 2013 Mac Pro also has four USB3 ports which together share a single PCIe 2.0 lane, which means the Mac Pro aggregate USB3 unidirectional bandwidth cannot exceed 500 MB/sec (1000MB/sec in each direction, e.g. See also MPG’s computer gear wishlist as well as diglloyd-recommended performance packages for Mac Pro. Send Feedback Related: 2013 Mac Pro, bandwidth, hard drive, Mac Pro, MacBook, MacBook Pro, Macs, RAID, SSD, Thunderbolt, USB
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