NVIDIA has just released new BETA ForceWare 100.59 Vista drivers that are supposed to enable SLI support for GeForce 6/7/8 series GPUs and DX9 (NOT DX10) support for GeForce 8800 GPUs. DX10 NVIDIA SLI support will be available in a future driver. Here?s a list of relase highlights:
This driver supports the following features for single GPUs: 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.
Grab the x86 version here http://www.nvidia.com/object/winvista_x86_100.59.html
and the 64-bit version here. http://www.nvidia.com/object/winvista_x64_100.59.html