There was alittle drop in performance when i went to the 4.3. I reverted back to the 4.2 for now. 4.3 still didnt fix the gamma problem with most opengl games. So i thought that ill stick with the 4.2 till they fix the gamma.
I lost about 500pts or so in 3dmark2001 and about 15 in 3dmark2003. I didnt notice any increases in anything. Even the ones ATI claimed to have fixed. (Mother nature increases, etc etc.)