I am hoping you guys can help me out here. I have been looking at a pc I built for someone, it had two matrox graphics cards connected to 6 monitors and was working well for a couple of years, the spec is basically Athlon x2 4800 processor; ASUS M2V mobo, 2 GB memory and was running Windows XP. We recently upgraded to Windows 764bit and have since had problemswith the graphics and the machine freezing. After several e-mails with Matrox it seems that the 2 cards we have are no longer supported and Win 7 drivers are not available, they suggested upgrading to their latest cards but at a cost of about £700. I looked around and decided that we may be able to use 3 graphics cards of the same type. one being PCIex and the other 2 being PCI. I bought 3 Geforce 8400GS cards and fitted them this morning, the first two went OK and everything worked fine but problems occurred after the third one with problems with freezing and running slow, I updated to the latest drivers which at least enabled the pc to boot up fine but still it seems to be slowly and freezing particularly if we try to open several things at once. We have ordered some more memory thinking that it may just be running slow with the extra cards but I am not totally convinced that that will cure the problem. Have you guys any thoughts?