I dont know, lucky me I am about 10 download, 2 upload. Depends if you host games and send files upload counts. If you surf the web or join for ex bf2 games download counts. That should be fine for playing games and surfing but dont try to upload anything. With my 2mb I can only upload at 200kb/s to my dads server.
EDIT- I didnt read the whole part. If you unplug atleast the router those numbers should almost double and the 2 computer wouldnt help either. Plus all the internet based programs in the background.
i3 540 @ 3066 MHZ
4GB DDR3 1600 1T 9-9-9-28
HD 5750 @ 850/2400
Antec Lanboy Air