I just did a bandwidht test on a brand new Hex S. Connected via ethernet to a Windows desktop. I got 600-700Mbps. The Hex S is in the "default" configuration, and it didn't seem to matter which ethernet port I used. No other services were being used, and the Hex S had all of the default firewall rules.
When looking at the system resources while conducting the test, it appears the CPU is the bottleneck. Is the Hex S, not capable of routing or switching at 1Gbps?