There are many solutions. Since you have a PCI Express16 slot, the best
option would be to get an NVidia Quadro Video Card that supports four monitors.
NVidia Quadro NVS 440 Graphics CardAlso, you can add a PCI video card, if you have an available PCI Slot. Just make sure that you
match the Chipset maker to the video card you already have. If you have Nvidia, use an NVidia
brand card. If you have ATI, use an ATI PCI card. (ATI is recommended most for this situation).
Here are some PCI Video Cards:
Radeon HD 2400 Pro - PCI Graphics CardNVidia FX 5200 - PCI Graphics CardAnother solution would be to get a
Matrox TripleHead2Go adapter, and use it on one
of your video ports. That way you can use the other port as your fourth monitor.
You can also use a
USB to VGA Adapter, or a
USB to DVI Adapter for each
extra monitor you wish to add. This is not the best option, but works great
for surfing the web, viewing documents and other simple tasks.
Computers Monitors Desktops Dual Monitor Multiple Monitors Multi-Screen