What are you looking for more? FPS or Stability? for me, i got higher FPS with 5.13, but i am SUPER stable with 5.22. Also there are better bug fixes in the 5.22. I don't mind loosing 3-4 FPS for having better stability. The only draw back i can see to teh 5.22 is that the little "NVIDIA" logo is always on in games. Even if you uncheck it in Advanced settings, it is still there. other than that, i say 5.22 are the best for my TNT-2 Ultra.