Quad-SLI goodness for the masses has become officially supported today with the release of NVIDIA's latest WHQL certified ForceWare 91.45 driver suite. Below is a brief listing of changes/features :-

- Adds support for Quad NVIDIA SLI Technology on GeForce 7950 GX2 GPUs
- Includes the new NVIDIA Control Panel
- New NVIDIA PureVideo features and enhancements
*Adds noise reduction post processing
*Adds image sharpening post processing
*Improved Inverse telecine algorithm
*Improved de-interlacing algorithm
*Improved compatibility with third party MPEG-2 decoders
- Microsoft DirectX 9.0c and OpenGL 2.0 support

Strangely enough however, these new drivers ONLY support GeForce 7950GX2 graphics cards, users of other GeForce cards are stuck with the previous release for now.

There's some coverage on the new driver as per the linkies below folks.

- Dailytech
- Guru3D
- HotHardware
- TGDaily
- bit-tech

And finally, here's NVIDIA's press announcement detailing the official introduction of Quad-SLI for the Do-It-Yourself crowd.

SANTA CLARA, CA-AUGUST 9, 2006-NVIDIA Corporation (Nasdaq: NVDA), the worldwide leader in programmable graphics processor technologies, has made extreme high-definition PC gaming a reality for everyone with the release of the new NVIDIA ForceWare® 91.45 graphics driver with Quad NVIDIA SLI technology support. For the first time, users in the do-it yourself (DIY) segment have access to Quad SLI technology, which utilizes the power of four GPUs to make extreme high-definition gaming (XHD)-with resolutions of up to 2560x1600-a possibility for hardcore gamers and computer enthusiasts.