You'd be surprised how much difference there can be between two models. I would guess that the graphics system has no Apple-supplied driver for Win 7/64, which may be problematic but not insurmountable. Maybe the AirPort card too. The only sure way to find out is to give it a shot; install 64-bit Windows 7 and find out what devices don't work the way you expect them to. Seriously, there has been almost no reporting of how much doesn't work in "unsupported" Macs with Windows 7.