*the 9600SE is only a 64-bit card (waste of money).
*the 9600nonpro is 128-bit, and so is the 9600Pro, but the Pro has higher core/memory speeds than the 9600nonpro (9600pro: 400/600 | 9600: 325/400).
*the 9600XT is also 128-bit, but uses the RV360 core and, thus, a higher core speed (500/600).