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#11
One display is enough for most people. Two displays are so nice for productivity work. Three displays are nice for hardcore gamers. Four and up are for people who monitor several important things, or heavily multitask or enjoy running simulations............in a nutshell. With the introduction of 27" monitors with 2560x1440(and 30" @ 2560x1600) resolutions, you can ultimately have enough real estate for two windows side-by-side for productivity work. Some people still find dual monitors better though. With the price drop of high quality monitors, it is much more common to see dual monitor setups.
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