well, the best way is to find it out urself...how???ok, restart the modem and note the time...now play for an hr (don't use any other application during the time that uses net)...disconnect the modem and check ur usage page...u'll get a very close figure, if not accurate
finally got to knowhow much bandwidth is used
i used du meter for tht
it showed around 4-5kbps with 2-3 kbps dld and 1-2 kbps upload not much but still it messes up my stupid bandwidth limit of 500mb per month
u got mtnl 512?... is it night free?... cause if it is not.. then 256 nu is much better.. as u dont really feel the diff with 512 while surfing... n u got heaven d/ls at nite... n i bet ul get night time gamers too...