Nvidia released the v181.20 suite of graphics drivers. The new drivers also enable NVIDIA SLI technology on SLI-certified Intel X58-based motherboards with all SLI-certified GPUs, and enables NVIDIA PhysX acceleration on a dedicated GeForce graphics card. This means that you can use one card for graphics and dedicate a different card for PhysX processing for game-changing physical effects. (Note: GPU PhysX is supported on all GeForce 8-series, 9-series and 200-series GPUs with a minimum of 256MB dedicated graphics memory. This driver package automatically installs PhysX System Software version 8.10.13).

The software package also boosts performance in numerous 3D applications. The following are some examples of improvements measured with Release 180 drivers vs. Release 178 drivers (results will vary depending on your GPU, system configuration, and game settings):

Up to 10% performance increase in 3DMark Vantage (performance preset)
Up to 13% performance increase in Assassin's Creed
Up to 13% performance increase in BioShock
Up to 15% performance increase in Company of Heroes: Opposing Fronts
Up to 10% performance increase in Crysis Warhead
Up to 25% performance increase in Devil May Cry 4
Up to 38% performance increase in Far Cry 2
Up to 18% performance increase in Race Driver: GRID
Up to 80% performance increase in Lost Planet: Colonies
Up to 18% performance increase in World of Conflict

Please read the release notes(Win XP) for more information.

Downloads are available here.