ade.h. I bought two of these cards to add to my board that had 1.1 only. The reason I bought them was simply because my peripheral hardware was also USB 2.0.
Can't say for certain that you will notice a difference but yes, the speed of data transfer will be much quicker from 12mbps-480mbps but in the end it will be determined by the speed of your hardware such as the scanner and printer engines. The transfer of photo's from camera to PC do seem to be quicker. j.