Comment 6 for bug 206522

I think http://tjworld.net/wiki/Linux/Bug/PciAllocationAlgorithm has a pretty good technical background on this. It also mentions kernel bug http://bugzilla.kernel.org/show_bug.cgi?id=10461 . Note that this problem doesn't just occur with the binary nvidia driver, but also with the open source nv driver; it really is a pci allocation issue.