You cleaned that desk before you took that photo, admit it!Four screens work well for me. Here's mine:
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The monitors are attached to Ergotron arms:
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I also had to add a video card to my computer that would support 4 monitors. It was the ATI Firepro 2460:
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Previously my setup was only 2 screens. But, since I upgraded to the four-screen setup, its definitely improved my efficiency.