When you have a grid of black edges obscuring your view, it's time to stop adding more monitors. Additional screens are best used for displaying other stuff. A second screen for TS3, wiki etc. is nice, and more can be handy for graphics work.
This is for showing multiple windows. Stock trading platforms, Research platforms, messaging system outlook a few pdf reports, blah blah blah... I aint no noob at two screens yo. Take yo haterade elsewhere. Sorry... I got very little sleep.
