Mac Pro connects to the G network on my dual-band instead of N

Hi. My Mac Pro keeps connecting to the G network on my dual-band instead of N. I can confirm the network/router are fine because my Mini connects to the N network fine, on the correct channel and at 270 Mbit/s.
I'm using a NETGEAR RangeMax Dual Band Wireless-N Router. It is capable of simultaneous N and G networks as well as 2.4Ghz+5Ghz.
I've tried every channel and combo. Very occasionally the Mac Pro will register the N network 270 Mbit/s but will drop back to 54 Mbit/s.
More evidence, AP Grapher reports that it is using the G channel (eg 9) instead of the N channel (eg 43).
I also tried a Netgear DGN 2.4Ghz wireless-n router with the same result. That router only runs N, and only at 2.4Ghz, but Network utility reported that it was usually connected at 54 Mbit/s instead of 130 Mbit/s.
Combined with the fact that the Mac Mini works fine suggests to me that my network card is faulty.
Any suggestions before I lug this big beast back to the store for a new card?
Thanks.

I believe I've solved the first problem. The router gave both networks the same SSID by default. I have now set them to
myname-n
myname-g
I can now choose either network and the link speed is reported as 270 Mbit/s or 54 Mbit/s respectively.
However, I can still only achieve peak transfer speeds of 2.8MB/sec and AP Grapher reports 41/270 Mbit/sec unless I switch to 2.4Ghz only, in which case I can achieve 52/130 and 4.3MB/sec, well below 270 Mbit/s or even 130.
Message was edited by: oodlum

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