Two rival technologies promise to rid games of stuttering and tearing.

Once you’ve used a variable refresh rate monitor, you can’t go back. AMD’s FreeSync and Nvidia’s G-Sync technology promise PC gamers a buttery-smooth experience free of stuttering, screen tearing, or V-Sync-like input lag. But both ecosystems have their perks—and their downsides.

Now that adaptive sync monitors have several years of maturation under their belts, it’s time to take stock of FreeSync vs. G-Sync yet again. Here’s everything you need to know about AMD and Nvidia’s gaming displays.
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https://www.pcworld.com/article/2974781/g-sync-vs-freesync-faq-how-variable-refresh-rate-displays-make-pc-games-super-smooth.html