Try the latest NVidia drivers 353.06 read info below;

GeForce Game Ready Driver
" In addition, this new Game Ready driver provides a number of new gaming features and benefits based around G-SYNC technology, Dynamic Super Resolution, and enhancements for the latest new titles."

 

Gaming Technology
Supports G-SYNC technology in windowed mode, offers both G-SYNC (V-SYNC on) and G-SYNC (V-SYNC off) options, support for Ultra-Low Motion Blur (ULMB) in the NVIDIA Control Panel, provides Dynamic Super Resolution (DSR) for notebooks with discrete GeForce GPUs, and optimizations and bug fixes which can provide increased performance for Kepler-based GPUs.
 

Asus just revealed their new PG279Q IPS 144hz 2560x1440 Gsync 27" monitor at Computex.

It's like the ROG Swift, but with an IPS panel and probably a few milliseconds slower response time.