NVIDIA now offers new beta version 266.35 beta drivers for their graphics cards featuring support for the newly released GeForce GTX 580 and GeForce GTX 570 GPUs. The drivers include performance improvements for the 400 and 500 series and improves the appearance of StarCraft II: Wings of Liberty by adding support for ambient occlusion. There are new beta drivers for Windows 7 and Windows Vista, Windows XP, Windows Vista 64-bit, Windows 7 64-bit, and Windows XP 64-bit. There are more details on GeForce.com, and the listed performance improvements follow.

• Increases performance for GeForce 400 Series and 500 Series GPUs in several PC games vs. the latest Release 260 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 580:
  • Up to 7% in Battlefield Bad Company 2 (1920x1200 4xAA/16xAF)
  • Up to 12% in Battleforge (SLI 1920x1200 4xAA/16xAF Very High)
  • Up to 11% in Call of Duty: Modern Warfare 2 (SLI 1920x1200 4xAA/16xAF)
  • Up to 7% in Dirt 2 (SLI 1920x1200 4xAA/16xAF)
  • Up to 7% in Far Cry 2 (1920x1200 4xAA/16xAF)
  • Up to 5% in Just Cause 2 (1920x1200 4xAA/16xAF Dark Tower)
  • Up to 5% in S.T.A.L.K.E.R.: Call of Pripyat (SLI – 1920x1200 4xAA/16xAF)
  • Up to 9% in Stone Giant (SLI 1920x1200, DOF on)
  • Up to 8% in Unigine Heaven v2.1 (SLI 1920x1200 4xAA/16xAF)
• Improves performance in Final Fantasy XI on GeForce 400 Series and 500 Series GPUs.