it all depends on what you are doing
if there are a bunch of people you are playing with/against, it is going to require a lot more bandwidth. becasue the game has to keep track of the positions, and the like of all of hte other players, and give that information to you.
on a normal game 3-4 players, it would need 4-5k a sec to work. that would leave you with a high ping time (200-300). to eliminate a high ping time, the game would take about 10-15k a sec. even with that, you are looking at a ping around 75-100, which is acceptable, but still can irk you.