FreeSync

src: www.amd.com

FreeSync is the brand name for an adaptive synchronization technology for LCD displays that support a dynamic refresh rate aimed at reducing screen tearing. FreeSync was developed by AMD in collaboration with VESA and released in 2015 in response to Nvidia's proprietary, closed, and more expensive G-Sync. FreeSync is royalty-free, free to use, and has no performance penalty.

Video FreeSync

Adaptive-Sync

In 2015, VESA announced Adaptive-Sync as an ingredient component of the DisplayPort 1.2a specification; FreeSync is a hardware-software solution that uses DisplayPort Adaptive-Sync protocols to enable smooth, tearing-free and low-latency gameplay. FreeSync has a dynamic refresh rate range of 9-240 Hz. FreeSync has also been implemented over HDMI.

Maps FreeSync

Advantages

Helps improve battery life by reducing the refresh rate of the panel when the screen is static (meaning, the previous frame was the same as the current one).
Ensures that the transition between refresh rate is seamless and undetectable to the user.
Can be enabled by plug and play, making it transparent to the operating system and end user.
Reduces implementation complexity of the Timing Controller (TCON) and panel by keeping the GPU's pixel clock rate constant and varying blank parameters.
Dynamically adapts the display refresh rate to fixed video content frame rate for a power efficient and stutter-free video playback with anything over 30FPS.
Dynamically adapts the display refresh rate to variable gaming content render for low latency and a smooth, virtually stutter-free gaming experience.

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FreeSync 2

In January 2017, AMD announced the second generation of FreeSync. FreeSync 2 expands beyond the territory of its predecessor by also including standards for things like color and dynamic range. Requirements include removing the minimum frame rate, and setting a maximum on screen latency. FreeSync 2 also doubles the color and brightness spaces, and communicating the screen's specifications to the driver, enabling automatic support for high dynamic range.