Hey, Guys,
according to an article on gamenab.net (don`t know if the source ir trustworthy). You can enable G-syn on any monitor using modded drivers:
Source: http://gamenab.net/2015/01/26/truth-about-the-g-sync-marketing-module-nvidia-using-vesa-adaptive-sync-technology-freesync/
I have no way to test this, bet if some does please post your findings.