i'm looking to add a 4th lcd display. i could simply add another single display card, but it hogs pci slots. so i was wondering if i could put 2 dual head matrox cards in without any problems. that way i could remove the single card that is there now. i don't see a problem, but i asking anyway. if i can, should i go with 1 agp card and 1 pci card or should i use 2 pci cards?