Originally Posted by Seraphic- It doesn't

However, the 650 will be the only PCI card I have. At least this way it gets all the bandwidth.
It wasn't really newegg that posted that. It was just a user leaving feedback on a 550 card.
that's not the real reason.. but if you're planning to save this card for your Next computer, then you'll have to know your next computer would very likely NOT have PCI slots (or more than 1).
but if your current MB doesn't support PCI-e, then I guess PCI is what you're getting~