I just read this thread on the Apple Discussion Board and I'm not sure if I beelieve it.
Apple - Support - Discussions - SLI works ... If true, it's good news. It could mean SLI support is coming in MacOS X 10.5. But I'm not a windows guru. Can you SLI two Geforce 7300GT's?
The configuring of two slots to 8x and 8x, is possible, as an Apple technote verifies this. It was in one of our other threads where we were discussing SLI.