See my edit above, if you haven't yet. But yeah, this board has enough room for dual-slot cards, and as the specs say: 4 PCI-e 2.0 x16, 2 PCI-e 2.0 x4 (in x8 slot), & 1 PCI slot (The x4 and old PCI get covered up when using 4 dual-slot cards though.)

Pioneer PDP-5020FD, Marantz SR6011
Axiom M5HP, VP160HP, QS8
Sony PS4, surround backs
-Chris