It's a Mac mini running inside an AKiTiO Node, paired with an AMD Radeon R9 Fury X. This Mac mini was to be recycled because of a dead hard drive and my customer no longer wanted it. I thought why not do something fun with it. 
All Macs with Thunderbolt port are capable of running an external graphics card. I put together an eGPU for Mac setup guide.
http://browser.geekbench.com/v4/compute/438212
All Macs with Thunderbolt port are capable of running an external graphics card. I put together an eGPU for Mac setup guide.
http://browser.geekbench.com/v4/compute/438212