How to find a 65nm console without opening the box (175W PSU):
This is the easiest and best way to see if you have a 65nm (Falcon) console without opening the box. All you need to do is look at the information label (lot #, team label) on the side of the box and look at the power information.
If the label says 175W, then the console is a Falcon console. If the label says 203W, then use one of the other two methods to see if the console is Falcon.
175W Falcon Label:
http://i181.photobucket.com/albums/x127/MRCUR/175w.jpg
175W Falcon PSU Label:
http://i181.photobucket.com/albums/x127/MRCUR/new360brick.jpg
If you find a 175W console, you 100% have a Falcon console. The new 175W PSU will NOT work with old (90nm) console. The plug that goes into the console has been changed to all plastic, and has a different layout then the old plug. There are already multiple revisions of the 175W PSUs, but there is no difference between them.