The Phoronix crew delve into the world of SLi on the Linux platform with their in-depth look at the newly-released 1.0-8174 driver. This driver not only adds SLi support, it tosses in the NVIDIA-xconfig utility. They look at driver performance with a single 7800GTX here, & toss in the SLi benchmarks on this page. They say the drivers are a bit buggy, but they were able to achieve 294% improvement over their single-card configuration :-o