I am just doing a straight SMB file copy from the desktop to the server. But I think I figured it out, when I was getting the 380Mb/s transfers I was watching TV at the same time. My Ceton tuners are hosted on my WHS. So I think that may have been slowing down my transfer speed. When I was getting the 900 Mb/s transfers I was listening to OTA radio and doing no other computer tasks.
