zampa on DK2: Having issue achieving 75fps on some demos AND you have multiple monitors? Disabling extra monitors might do it. - http://www.reddit.com/r...
Sep 8, 2014
from
"You can use [Bilago's Game Manager](https://developer.oculusvr.com/forums...) to start an executable and force the Rift to be the primary monitor, which is usually how you can achieve the 75Hz v-sync successfully. Once you exit the executable, the game manager switches your monitor back to primary."
- Nathan Chase