Are people switching out their wireless adapter (Atheros in G74x) because of lame -n performance? I've found several other users who have the same problem as I, namely when the adapter is in the "automatic" mode (the only way to "get in" the -n mode), the max connect speed is 64Mbps and internet download speed drops to 1.5Mbps. However, by selecting b/g mode, even though the connect speed drops to 56Mbps, my internet download speed increases to nearly 4Mbps (normal for my pathetic DSL service). Clearly there is a problem with the Atheros -n connectivity which ASUS will not acknowledge. My G84x was returned from BIZComm with with a terse "could not duplicate" .
Note: I have 2 older computers with -n adapters which connect with my Linksys E2000 router at 144Mbps and provide me with full internet bandwidth.