Thunderbolt ports have a maximum 40 Gbps transfer rate. Since external enclosures use 1 Thunderbolt 3 connection, they only get 40 Gbps to the graphics card, which bottlenecks it. So if you use at least 3 Thunderbolt ports, you get (40 x 3) 120 Gbps to the graphics card, which should not bottleneck it, and give you full performance.
I thought of this question because I saw how many mini PC's have no port for a graphics card (PCIe or MXM) (like the Mac Mini). But I saw the Mac Mini has 4 thunderbolt ports so that's where this question came from.
I thought of this question because I saw how many mini PC's have no port for a graphics card (PCIe or MXM) (like the Mac Mini). But I saw the Mac Mini has 4 thunderbolt ports so that's where this question came from.