Due to deteriorating eyesight, I need to increase my charts size. Currently running a Nvidia GeForce FX5200 AGP with 2 monitors and have 2 PCI slots available. Is it possible to add 2 more GeForce FX5200 PCI cards and be able to run 6 monitors all together as one extended screen? Does it has to be the same cards? What other options are feasible? Thank you in advance for your help.