I personally think it is better to have at least 2 for gaming, more is better if you want eyefinity, but 2 is a good number for casual to mid range gaming. Having a game on my primary 1080p monitor with chats, builds, music, and chrome on the second etc is a great thing to have. Once you are done with gaming you can multitask with far more ease. Getting 2 is a good decision no matter what, gaming it will help, non gaming even more so. I got a cheap 90 dollar 21 inch acer monitor just to have for a secondary at the moment. You wouldnt use dual monitors for one image stretched across, but rather an extended desktop. Simply put, get 2 for starters no matter what. As long as you dont try eyefinty, which you cant on 2 anyway, its not very taxing on the gpu.