There’s nothing that takes me out of a game more than frame tearing. I mean, my day-to-day life is visually smooth and fluid, and I expect as much from my video games. But sometimes things get out of sync, and the fabric of visual reality is torn. (I’m still talking about video games here and not my life; honestly!) G-Sync is Nvidia’s solution to the scourge of frame tearing, but what are they exactly, and what causes them?