NVIDIA published the GeForce 260.63 beta drivers, you can download them over here. This new release promises big performance gains for the GeForce GTX 400 series and it also has some new Blu-ray 3D and HD audio features.
Here's the full changelog of the Windows 7 driver:
New GPU Support
* Adds support for the newly released GeForce GTS 450 GPU.
* Increases performance for GeForce GTX 400 Series GPUs in several PC games vs. v258.96 WHQL drivers. The following are examples of some of the most significant improvements measured on Windows 7. Results will vary depending on your GPU and system configuration:
GeForce GTX 480:
+ Up to 10% in StarCraft II (2560x1600 4xAA/16xAF Ultra)
+ Up to 14% in S.T.A.L.K.E.R.: Call of Pripyat (1920x1200 4xAA/16xAF)
+ Up to 16% in S.T.A.L.K.E.R.: Call of Pripyat (SLI – 2560x1600 4xAA/16xAF)
+ Up to 6% in Aliens vs. Predator (SLI – 1920x1200 noAA – Tessellation on)
GeForce GTX 460:
+ Up to 19% in StarCraft II (SLI – 1920x1200 4xAA/16xAF Ultra)
+ Up to 15% in Battlefield Bad Company 2 (SLI – 2560x1600 4xAA/16xAF)
+ Up to 12% in S.T.A.L.K.E.R.: Call of Pripyat (2560x1600 noAA)
+ Up to 9% in Aliens vs. Predator (1680x1050 4xAA/16xAF – Tessellation on)
+ Up to 7% in Metro 2033 (1680x1050 noAA – Tessellation on)
+ Up to 11% in Dirt 2 (SLI – 2560x1600 4xAA/16xAF)
+ Up to 12% in Crysis:Warhead (SLI – 1920x1200 4xAA/16xAF Gamer)
+ Up to 13% in Far Cry 2 (2560x1600 4xAA/16xAF)
+ Up to 12% in H.A.W.X (SLI – 1920x1200 4xAA/16xAF SSAO Very High)
+ Up to 5% in Just Cause 2 (1920x1200 4xAA/16xAF)
+ Up to 22% in Riddick: Assault on Dark Athena (1920x1200 noAA)
+ Up to 5% in 3DMark Vantage (Extreme Preset)
* Adds support for playing back Blu-ray 3D discs when connecting your GPU to an HDMI 1.4 3D TV. Playback requires compatible software application from CyberLink, ArcSoft, Roxio, or Corel. For more information, NVIDIA Blu-ray 3D website.
* Adds lossless DTS-HD Master Audio and Dolby TrueHD audio bitstreaming support for compatible Blu-ray movies with GeForce GTX 460 GPUs*.
* Adds high definition 24-bit, 96 and 192 KHz multi-channel audio sampling rate support for compatible Blu-ray movies with GeForce GTX 400 Series ,GT 240, GT 220 and 210 GPUs*.
* Upgrades HD Audio driver to version 220.127.116.11.
*Note: A Blu-ray movie player update may be required to enable these new features; check with your movie players software manufacturers for more details.These features are only supported on Windows 7.