It depends how many players r playing, for example when 20 i need ~14kB/s download, than server need ~280kB/s upload but thats about 2200kbits. Probably u hav an adsl connection so the upstream is lower than your downstream, imo its about 300-400kb it will handle 6-8 players ... but thats random. My friends 512/512 handle max. 8p, but same number can even do a 2048/384 ! Just run mtaserver.exe and invite some people.