Sorry, I'm not up on the specifics of dual x16 boards. If you're looking for a board for non-gaming, just get whatever has enough of the right kind of slots for your video cards and peripherals. As far as I know, there is still only one PCIE dualhead card which is not x16... that's the x1 of Matrox. Therefore 4-monitor setup solutions for PCIE boards [without using PCI slots] are still rather limited. An AGP board with 5 or 6 PCI slots still makes a lot of sense for me in a trading rig.