Let's assume you have a game that can easily run at, let's say 120 FPS on average. With FreeSync at 60 Hz, you'd be limited to 60 FPS at 60 Hz. That's not bad, but it's not great. With a 144 Hz capable FreeSync monitor, your framerate would be unlimited, and your refresh rate would be much higher as well due to the synchronizing of the refresh rate to frame rate. This would result in smoother motion due to the higher refresh rate (I'm not confusing refresh rate with frame rate).
120 Hz is noticeably quite smoother than 60 Hz.
So now let's say you have a game that always gets 150+ FPS. On that 60 Hz FreeSync monitor, you're limited to 60 FPS at 60 Hz. On the 144 Hz FreeSync monitor, you're going to get 144 FPS at 144 Hz. That's fantastic.
Or let's say you have a game that can barely go above 50 FPS on average. Obviously with this kind of a game, a 60 Hz FreeSync monitor would be plenty and a 144 Hz FreeSync monitor would be no different for this game than a 60 Hz FreeSync monitor.
So, it depends on whether you can even get framerates high enough that would let you experience the benefits of having a higher refresh rate with FreeSync. The higher the refresh rate is, the smoother all motion is, even at the desktop.
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