I have Benq XL2430T 144hz, and a dell 60hz. Both running at 1920x1080. I am trying to put the 2nd monitor to my mobo because when I have browser up on my 2nd monitor and a game running on my benq, it cause my game to have 60hz feel like gameplay. But when I minimize the browser and go back to playing games it feels 144hz again. There was this forum where the guy said when he put the 2nd monitor to his MOBO it fixed it,.