Yes , You may add one video card in PCI or PCI - E if you have one
you may find cheaper to get VGA-DVI D port converter
(i dont know how is their output)
it is better to add a PCIE or PCI card with DVI-D port
remember while buying that DG41RQ has both PCI and PCI-e slots
Better to buy converter. This mother board designd without using oci or pci-e card.