I used Dell PCI riser card, Part number X8474, to allow me to use a full height video card. This riser card has a PCI slot and PCI express slot but only the PCI slot will work. It is designed to plug into two slots but since the GX520 does not have a PIC express slot, it will only plug into the PCI slot. The other connector just hangs in space where the PCI express connector should be. I’m using an ATI VisionTek 9250 video card to run two monitors. A Dell LCD screen and a 17” regular monitor just fine.