I am running ubuntu server on a late 2012 mac mini and i the on board ethernet port is rated for 1gig. My router is a CGNM-2250 from shaw which is also rated for gigabit. I am running windows 10 on my main pc and when i transwer from the NAS which is setup using samba i only receive 64mbytes max. The NAS and my win 10 pc are both connected to a dlink 10/100/1000 switch. Both cables going to the nas and pc are cat 5e and the cable going to my router is a cat 6 cable. as far as i know i dont need to do anything else to get the speed i am expecting.