lets say I have a single LCD monitor but I want to buy a dual one... am I better to find a dual monitor that is moulded together or do I just buy 2 singles? then I assume I need to replace the chip so I can use both of them off 1 computer right?
you buy two singles (never heard of two "moulded" together). www.newegg.com you don't replace the chip but you must buy a dual video card like www.matrox.com very easy to setup, i drive EIGHT monitors off one computer.
Depending upon your current single card, you may be able to just buy a 2nd compatible single rather than a new dual head.