Drivers are the same, but the hardware is different. I'm not sure exactly what is different since I'm not familiar with the older TNT2 stuff. Based on newer nVidia chips, the Pro has some extra features and/or a faster clock speed. Since you can use the Detonator drivers with the TNT2's (best to use some older ones below the 7.xx series), it doesn't matter that much. The drivers will install for the specific chip you have in the video card if there are any hardware differences besides a faster clock speed