NVIDIA today released GeForce 320.00 Beta Drivers and they are said to increase performance by up to 20% for GeForce 400/500/600 series GPUs in several PC games vs. GeForce 314.22 WHQL-certified drivers. This is a significant gain and it can be had across three generations of video cards! You can download the GeForce 320.00 Beta drivers for Windows 7/8 64-bit here and 32-bit here. If you need Windows XP or notebook drivers you can find the direct links in our forums via the link at the very bottom of this post. The GeForce site doesn’t have these listed just yet!
Here is one example of measured gains: GeForce GTX 660: