On my 5970 on 64-bit Windows 7, there is no difference performance-wise (higher or lower) compared to 2.2.

However, I also upgraded my drivers from 11.2 to 11.4 at the same time.  There is one noticeable difference and that is that the fan noise is TERRIBLY louder than it used to be.  The temperature is now pegged at 88 degrees C when it used to be pegged at 89.