So my main focus and reason for doing this is because I am in the process of switching my office over where all servers and main workstation are on 10Gb connections. And like anyone else that has looked into this for a Mac outside of the older tower Mac Pro, you really aren't going to get 10Gb under the $400-500 range. I decided there had to be a way to make this work on my nMP for at least of half that price. Fortunately I already had an Akitio Thunder2 PCIe box from when I tried eGPU's earlier last year. https://www.amazon.com/Akitio-Thund...id=1495049719&sr=1-1&keywords=akitio+thunder2 I then searched for a few 10Gb NIC's with Mac Drivers available. I came across the SolarFlare SFN5122F Low power consumption: Less than 5 Watts Support up to 254 Virtual NICs Full 40 Gbps Bidirectional Line-rate Performance Low Latency Dual-Port SFP+ Now SolarFlare only lists 10.9 and older drivers on their site but I decided to take a chance with it regardless. The prices vary on this card from sometimes $120-340 but I thought I could do better and took to eBay. I found one for $46 shipped so I ordered it right away. I received the 'package delivered' update at lunch today and got back to the office as soon as I could. I was fingers crossed the entire time because I had previously ordered a few Mellanox ConnectX-2 cards and couldn't get them to work over Thunderbolt. But the SolarFlare worked! At first I just placed the NIC into the Thunder2, connected the Thunderbolt2 cable and power and just wanted to see if macOS would detect it without doing anything else. No joy. I headed to the support website and downloaded the drivers Solarflare OS X Driver Package [OS X 10.9 - Signed] Installed the drivers and restarted the Mac and right after boot up it was there. 2 new Ethernet ports @ 10Gb At the moment I just have it connected to a 10Gb switch and plan on getting the file servers switched to 10Gb this month when I get the time. So outside of a speedtest and just trying a file transfer, which nothing went over Gigabit speed at the moment but I was just more so excited that I didn't have to drop $500 on a similar setup. This little project came in at $263. The Thunder2 has a case to cover and protect the electronics I just didn't have it on today.