I have a nVidia Geforce 8600g -lrb- pcie x16 -rrb- with two 27 '' monitor -lrb- Dell and Samsung -rrb- . I want to add three more 19 '' monitor but do not have any additional pcie slot . these Sparkle 8400 be a good alternative . I pop they in and add the three 19 '' monitor on the 8400 . they be slower for thing like re-sizing window and Netflix video playback , but since I be only use they as secondary monitor , it be fine . no compatibility issue as all video card be use the same geforce driver .