as promised, here's the full review of the PG279Q. took a lot of work and overtime to do all that testing. i must try and cut it back for the future!
http://www.tftcentral.co.uk/reviews/asus_rog_swift_pg279q.htm
Not to nitpick but..
"1) Turbo key - You can select your preferred refresh rate with a turbo key to toggle refresh rates on the fly without needing to access the graphics driver control panel. You can quickly select from 60, 120, or 144Hz (or max overclocked refresh rate if you've used that option). This may be handy while in the middle of a game to match the different frame rates of different games to maintain smoothness. It can also be used to lessen the load on your graphics card and CPU by setting a cap on the Hz for different games."
It takes forever on my monitor to "flick" between them.