Never mind about the number, Savage News managed to get their hands on some slippery leaked drivers going by the name Detonator XP v21.83. These are new, as yet no words on performance, fixes etc etc but I bet they will be better than the 21.81"s that seem to be giving everyone problems. As usual its up to you what you do with these, we take no responsibility if your PC grows legs and jumps out of the window after nicking your beer out of the fridge.
Please let us know how these perform on your system if you are brave enough to install :)