I probably won't personally won't be trying this one as I don't see any benefits for a GTX580 card. None the less, it's out for those of you who may see a reason to try it.

Release Highlights
This is the first beta driver from the R304 family of drivers.

New in R304 Drivers:

Performance Boost – Increases performance for GeForce 400/500/600 Series GPUs in several PC games vs. GeForce 301.42 WHQL-certified drivers. Results will vary depending on your GPU and system configuration:
GeForce GTX 680:
Up to 18% in Batman: Arkham City
Up to 15% in Dragon Age II
Up to 10% in S.T.A.L.K.E.R.: Call of Pripyat
Up to 60% in Total War: Shogun 2 (fixes performance issue with latest game patch)
GeForce GTX 560:
Up to 14% in Batman: Arkham City
Up to 5% in Battlefield 3 with SLI
Up to 4% in Dragon Age II
Up to 8% in The Witcher 2: Assassins of Kings with SLI
Up to 7% in Lost Planet 2
Key Fixes
Fixes an intermittent vsync stuttering issue with GeForce GTX 600-series GPUs.
Fixes an issue where some manufacturer’s factory overclocked cards default to and run at lower clocks.
Fixes a performance issue in Total War: Shogun 2 with the latest game patch.
NVIDIA SLI Technology – Adds or updates the following SLI profiles:
Spec Ops: The Line
PlanetSide 2
F1 2011 – updated profile
Final Fantasy XIV – updated profile
Saints Row: The Third – updated profile
Torchlight II
Tribes: Ascend
NVIDIA 3D Vision – Adds or updates the following 3D Vision profiles:
Alan Wake's American Nightmare – rated Poor
Borderlands 2 – updated profile with new convergence settings
Depth Hunter – updated rating to 3D Vision Ready
Mass Effect 3 – updated in-game compatibility message and profile to be more compatible with community 3D mods
Max Payne 3 – updated rating to Excellent and updated in-game compatibility message to inform users to use DirectX 11, disable MSAA and use SSA0.
Street Fighter X Tekken – rated 3D Vision Ready
Tiger Woods PGA 12: The Masters – rated Good
Tribes: Ascend – rated Fair
The Walking Dead – rating Good
Other Profile Updates
Added NVIDIA Control Panel antialiasing support for Diablo III
Added NVIDIA Control Panel antialiasing support for L.A. Noire
Added NVIDIA Control Panel antialiasing support for Rayman Origins
Added NVIDIA Control Panel antialiasing support The Secret World
Added NVIDIA Control Panel ambient occlusion support for Star Wars: The Old Republic
Disabled FXAA for several Windows programs like Media Player and Movie Maker.
NVIDIA Surround
Surround settings now persisted after new driver overinstall.
NVIDIA CUDA
Includes support for applications built using CUDA 5 Preview or earlier version of the CUDA Toolkit. More information at http://developer.nvidia.com/cuda-toolkit
Additional Details

Installs PhysX System Software v9.12.0604.
Installs HD Audio v1.3.17.0.
Supports OpenGL 4.2
Supports DisplayPort 1.2 for GeForce GTX 600 series GPUs.
Supports multiple languages and APIs for GPU computing: CUDA C, CUDA C++, CUDA Fortran, OpenCL, DirectCompute, and Microsoft C++ AMP.
Supports single GPU and NVIDIA SLI technology on DirectX 9, DirectX 10, DirectX 11, and OpenGL, including 3-way SLI, Quad SLI, and SLI support on SLI-certified Intel and AMD motherboards.

Thanks for the heads up Hellshade - might be worth a punt for the vsync fixes here.

Don't forget to re-run CFS3Config after installing the driver update and before running OFF!

You can also use OFFset, included with the OFFbase download, to backup your CFS3 graphics settings first, then restore them after the driver update and all.

Pol,

Did you notice any benefits to running the new driver? Or any steps "backwards" from it?

Hellshade

All seems good to me Hellshade, main one it is smoother - probably vsync fix.