December 1, 20169 yr This is not so much question, nor that grand of an accomplishment, but more of a reference for others that might have the same problem or are looking for functional USB PCI hardware. In El Capitan and Sierra, my file transfer speeds were always between 40-60MBps, never utilizing the full availability of the gigabit virtual adapter. Maybe for some of you all, that's fast enough for streaming/browsing/gaming. But I often move large amounts of data around and would much rather it not take twice as long and would prefer to push data at 110+MBps. No matter what I tried changing, the speeds wold not budge in os x. I know it wasn't a hardware problem because a windows 10 vm using the same interface would saturate the same connection. Yesterday I installed an ASRock USB 3.1/A+C card. Partly for this slow speed issue, but also to complete my desktop vm usability (adding in a plug and play usb hub to the card will make it much more functional for daily use.) Passthrough xml was standard and easy to do. But after an hour of frustration and having it not show up in el capitan, I did some reading and discovered it doesn't work with that version of os x because of some changes apple made after Yosemite. But it worked instantly in sierra, recognizing the card as USB 3.1. I then used a Trendnet TU3-ETG (ASIX Electronics Corp. AX88179) USB3 to Gigabit Ethernet adapter. I had to download their drivers from web and it works flawlessly. Complete usage of gigabit bandwidth. I ran the OS update for sierra afterwards and lost the the usb/gigabit adapter, but just reinstalled the drivers again and it came right back. The computer running unRaid only has usb 2 on it, so to step up the speed, both networking and usb file transfers, this was a relatively inexpensive way to save a bunch of time.
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