If you are getting stable maxes of 465 and not speed hikes, you actually are on a 4mb connection. It is impossible to hit 465 on a 2mb line since the maximum is 2048/8 = 256 if i'm not mistaken, just like how 512kbps is the max on a 4mb connection. To hit a max of 1mbps, you'd need an 8mbps...