I usualy use a Matrox G450 on my dualhead Desktop. I want to connect an old Matrox Millenum II pci graphic card to get a three monitor desktop. Unfortunately, although there is no IRQ incompatibility and seems that it must work, I'm only able to view two monitors working: the pci and one agp head or the dual agp card. Tomorrow I will try to readjust the memory setings in order to get everything work. Anyone had get it?