http://usa.asus.com/prog/spec.asp?langs=09&m=A7N8X
Did anybody answer the original question? Blase, I would think that the specs for the A7N8X would be the same as yours (basically). It supports 3GB max but I wouldn't count on getting all 400 MHz outa your DDR 400 RAM. If I remember correctly the nForce 2 chipset was notorious for not allowing you to populate all of your DIMM slots and run at their default speed (DDR 400). However, don't quote me on that, I smoke too much crack to be reliable.