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Gaming and Media Features
Q: What features are added to the HDMI 2.1 Specification for video gaming and media playback?
A: HDMI 2.1 Specification has added the following new features:
Auto Low-Latency Mode (ALLM)
Variable Refresh Rate (VRR)
Quick Frame Transport (QFT)
Quick Media Switching (QMS)
Q: What is Variable Refresh Rate (VRR)?
A: VRR lets a gaming source deliver video frames as fast as it can, which in many cases is slower than the normal static refresh rate. Graphics processors require different absolute periods to render each frame, and this time is dependent upon the complexity of the scene, the horsepower of the GPU, the resolution selected and the frame rate. When the GPU is taxed by the other three factors and does not finish rendering the next frame by the time it needs to be displayed, the source must either repeat the current frame or display the partially-rendered next frame, which causes judder and tearing. By waiting until the next frame is ready to transport it, a smoother gaming experience can be provided to the user.
https://www.hdmi.org/manufacturer/hdmi_2_1/index.aspx