i doubt it.
if you're talking about that buffalo router, i think you need extra stuff tomake it run at that speed.
if you have the new iMac with 11n cards, i recommend the Belkin N1, $110, router, which has the 802.11n protocol, which has much better range and speed that 54mbps g protocol.
is it faster than 125 mbps g protocol? not sure
anyway, i've been using it and voila! it works exactly like its supposed to.
unlike that awful linksys router i had.