They all have the "n" capability and it works really well but of course you need an "n" capable router. One thing to remember that many forget; your network will only run as fast as your slowest computer. This means that if you have a new iMac and an older one ( as I have a G4 with an extreme card in it) on the same network, the entire network can only run at "g" speed.
A quick question for all of you in the know: If my G4 computer is sleeping and the only computer running on the network is my new aluminum iMac, will the network run at 802.11n speed?
Thanks in advance,
Mick