i went from the official det 3 drivers on nvidia's site (v6.5) to the 12.60 beta and even though it brought my 3dmark2k1 scores up a little (~50), my fps in counter-strike is flutuating now.  I used to get 99 fps solid.  now i get a flutuating 70-99 which is pretty annoying.  and NO, i did not change any settings.  i think i will switch back to the official drivers.