These drivers really boosted my performance, I was able to break 14k and go above with clocks at 621/1600/2050. Before my roof was 13800 with 641/1700/2100. http://service.futuremark.com/compare?3dm06=3536668
Well, congratulations. I found they improved stability just a little (nVidia themselves have said that different drivers can have different effects on overclocking).
