NVIDIA just released an updated ForceWare driver. It's build 178.24 and carries WHQL certification, meaning it received two thumbs up from microsoft.

New in Version 178.24:

• Adds support for newly-released GeForce 9-series motherboard GPUs.
• Includes several application compatibility fixes. Please read the release documentation for more details.

Release 178 Highlights:

• WHQL-certified driver for GeForce 6-series, 7-series, 8-series, 9-series, and 200-series GPUs.
• Adds support for GeForce 9800 GTX+, 9800 GT, 9500 GT, and 9400 GT GPUs.
• Adds support for NVIDIA PhysX acceleration on all GeForce 8-series, 9-series and 200-series GPUs with a minimum of 256MB dedicated graphics memory (this driver package installs NVIDIA PhysX System Software v8.09.04).
• Experience GPU PhysX acceleration in several full games and demos today by downloading the GeForce Power Pack.
• Adds support for 2-way and 3-way NVIDIA SLI technology with GeForce GTX 200-series GPUs on Intel® D5400XS motherboards.
• Supports single GPU and NVIDIA SLI technology on DirectX 9, DirectX 10, and OpenGL, including 3-way and Quad SLI technology.
• Supports CUDA.
• Supports Folding@home distributing computing application. Download the high performance client for NVIDIA GPUs here and join the NVIDIA team: #131015.
• Supports NVIDIA GeForce 3D Stereo Technology.
• Supports GPU overclocking and temperature monitoring by installing NVIDIA System Tools software.
• Includes several 3D application performance improvements. The following are examples of improvements measured with Release 178 drivers versus v175.19 WHQL driver:
  • Single GPU increases up to 11% in 3DMark Vantage (performance preset)
  • Single GPU increases up to 11% in Assassin's Creed DX10
  • Single GPU increases up to 15% in Bioshock DX10
  • Single GPU increases up to 15% in Call of Duty 4
  • Single GPU increases up to 8% in Enemy Territory: Quake Wars
  • 2-way SLI increases up to 7% in Bioshock DX10
  • 2-way SLI increases up to 10% in Company of Heroes: Opposing Fronts DX10
  • 2-way SLI increases up to 12% in Enemy Territory: Quake Wars
  • 2-way SLI increases up to 10% in World in Conflict DX10
• Includes numerous 3D application compatibility fixes. Please read the release notes for more information on product support, features, driver fixes and known compatibility issues.

All modern GeForce graphics cards to date are supported. We have a thread open on these drivers right here. These drivers do include the PhysX 8.09.04 driver, too.

Have you read our eVGA GeForce GTX 280 HC16 Hydro Copper review