Late last night NVIDIA released an updated version of their GeForce 8800 Vista drivers, up to 100.59.  This version adds SLI support, but ONLY for GeForce 8-series cards. 

Release Highlights:

  • Beta driver for NVIDIA SLI™ support for GeForce 8800 GTX/GTS GPUs
  • This driver supports the following features:
    • Single GPU support
      • DirectX 9 support for GeForce 6/7/8 series GPUs
      • DirectX 10 support for GeForce 8800 GPUs
      • OpenGL support for GeForce 6/7/8 series GPUs
    • NVIDIA SLI support
      • DirectX 9 support for GeForce 8800 GPUs
      • OpenGL support for GeForce 8800 GPUs
  • DirectX 9 and OpenGL NVIDIA SLI support for GeForce 6 and 7 series GPUs and DirectX 10 NVIDIA SLI support for GeForce 8800 GPUs will be available in a future driver
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  • Please read the release notes for more information on product support, feature limitations, and known compatibility issues