Re: Can I ran a GTX 690 PCi 3 on my 12 core MacPro? by Kevin Cannon on May 7, 2012 at 2:52:00 pm
PCI 3.0 if backwards compatible, so you can stick any PCI 3.0 card in a PCI 2.0 slot and it will run at PCI 2.0 speed... there's just no Mac support for the 680 and 690...