They are drivers which are made especially for dedicated counter-strike 1.6 gamers. In other words, they give more FPS to "old" CS 1.6 than new games. They are so far the one and only drivers i've found well working on 1.6 with R9800Pro.
http://files.filefront.com/ATI_Ultim.../fileinfo.html .
And some info the drivermaker gave himself: " The Ultimate CS drivers are based on the older catalyst, the ones designed around older OpenGL platform games. Specifically for CS, this driver fixes a multitude of bugs including unreasonably high recoil and strange fps drops. Warning: This driver was made specifically for Counter-Strike (1.6), the use of these drivers in compilation with newer games may result in lackluster performance. As for 1.6, you may never find a better driver. Current release also does not support x800+ series. Lastly, graphical anomalies have known to make themselves present under 16bit color depth. Make sure you're running in 32bit when playing Counter-Strike."