Ok, I have read many posts here and elsewhere on this issue and must admit a limited understanding, which might be the problem really... I have a DIR-655 revA on current firmware. I have 3 different computers connecting, all with wireless-n cards but the max any will connect at is 65Mbps. Signal strength is fine, there just seems to be this cap for some reason and I cannot figure out how to get past it. There is one wireless G device (a printer) so I cannot set the router to n mode only and perhaps this is the issue? Otherwise the router is set to mixed mode g-n, auto bandwidth (appears throttled to 20MHz though - again is this the issue?)
Anyway, overall happy with this router but trying to increase performance now and not sure this is a router issue, a bandwidth issue (i.e. running at 20MHz) or what. Seems at a minimum one of these computers should connect at 130, 150, or even as much as 300Mbps but no dice.