I'll be using 3-way SLI GTX 580 on my hackintosh (mainly for gaming/gamedev in Windows, not really gonna be needing all that power in OS X), but I want to know how I might be able to get a GTX 580 working.
According to this:
viewtopic.php?f=15&t=8157&start=0
thread, GTX 580s are supported, but...