NVIDIA has moved with the release of the first full beta of R325 with the 326.19 beta drivers.
NVIDIA?s release notes
state that the 326.19 "increases performance by up to 19% [..] in several PC games vs. GeForce 320.49".
What?s New in Version 326.19
Increases performance for GeForce 400/500/600 Series GPUs in several PC games when compared to the GeForce 320.49 drivers.
NVIDIA SLI Technology
Added or updated the following SLI profiles:
- Added SLI profile for Spinter Cell: Blacklist
- Added SLI profile for Batman: Arkham Origins
NVIDIA PhysX System Software
This driver package installs NVIDIA PhysX System Software v9.13.0604.
HD Audio Driver
This driver package installs the HD audio driver, version 126.96.36.199
You can grab the drivers for all current desktop and mobile NVIDIA GPUs over at NVIDIA's driver download