Where to set the SLI option?

with the Fedora 8, GTX295 with driver version 180.51, and cuda toolkit 2.1 and SDK2.1
Is the so called “Nvidia control panel” “Nvidia X-server setting”?
There isn’t a option for SLI in the Nvidia X-server setting?
How can set the SLI option?

You can configure SLI with the nvidia-xconfig. If you run

nvidia-xconfig --advanced-help

you can see the available SLI modes. If this question is actually related to CUDA, then you should be aware that SLI doesn’t work with CUDA. If you want multi-gpu CUDA, you have to explicitly program it yourself, or use something like gpuworker http://forums.nvidia.com/index.php?showtopic=66598