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I'm typically running 1920x1200 unless I need to view photos 1:1 in Photoshop or Lightroom. Then I switch back to 1440x900 so that Photoshop will show 2880x1800 when I zoom to 1:1.
 
I lied I'm running 1920x1200 now, lol after i read this topic I decided to give it a try and I've been running it ever since.
 
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