6.75mb/s
54 divide by 8..
Plus, some routers split the connection, so if there's two wireless machines, they'll be getting 27 each max (or dividing it unfairly on demand), wireless really is crap for data transfer
i'm able to play a 720p 1.1gb, 40 minute file fine over the wireless section of my network mind, it is mkv though, but it works out an average of about 500kb/s
i'd hookup with gigabit where you can, and only wireless if you have to