Re: How to tell if wireless N is being used?
iwconfig will tell you the bit rate. 54 Mbps is wireless G speeds, anything above that should be wireless N, but theoretically it should be around 300 Mbps. I've never gotten above 108 because my router sucks with mixed mode with other Wireless G speed devices on my network, therefore reducing a potential 130-150 Mbps realistic speeds to around 108 Mbps.
If there's any trouble, it's likely to do with the driver you're using.
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NVIDIA Quadro FX 570m modified to use NVIDIA GeForce 8600m GT drivers in Windows