Throughput of RB260GSP switch - values in table of results seem low?

I’m looking at getting a RouterBoard RB260GSP (http://routerboard.com/RB260GSP) to use as a switch in a small home newtork.

I’ll be running to Unifi UAP-AC-LR’s behind the switch, as well as plugging in a 2-bay NAS.

I saw some of the switching results mentioned on the product page (http://routerboard.com/RB260GSP), and was wondering if I could get some help in interpreting them correctly.

What is the difference between capacity and throughput in the table?

Also, if I’m reading it right, with a 1518 byte frame size, the switch can pass through either around 5.9 or 11.8 megabits per second.

That doesn’t sound like a lot…in fact, that sounds like very little. I would be able to saturate that quite quickly by doing a file transfer between say, the NAS (which has a gigabit port) and another host plugged into another port.

Am I perhaps reading the table wrong?

5,922.0 Mbps = 5.9 Gbps
11,844.0 Mbps = 11.8 Gbps