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By PURPLELEC | 15 November 2023 | 0 Comments

The difference between HDMI2.0 and HDMI2.1

  The biggest difference between HDMI2.0 and HDMI2.1 is bandwidth. The transmission bandwidth of HDMI2.0 is 18Gbps, and the bandwidth of HDMI2.1 has been upgraded to 48Gbps. The most direct improvement brought by the increase in bandwidth is the increase in the amount of data transmitted.
  HDMI2.0 can support up to 4K60Hz screen output, but HDMI2.0 does not support opening HDR when the 4K60Hz color space is RGB. It only supports opening HDR in the YUV4:2:2 color mode. This means that it is necessary to sacrifice a certain picture color surface in exchange for a higher refresh rate. In addition, HDMI2.0 cannot support the transmission of 8K video. HDMI2.1 not only supports 4K120Hz, but also supports 8K60Hz.
  In addition to higher bandwidth, HDMI2.1 also supports VRR (Variable Update Frequency). Gamers should be aware that screen tearing can occur when the screen refresh rate output by the graphics card does not match the refresh rate of the monitor. The simplest method is vertical synchronization, but vertical synchronization locks the frame rate at 60FPS, which affects the gaming experience.
  To this end, NVIDIA has launched G-SYNC technology, which coordinates the data synchronization of the display and GPU output through the chip, so that the display update delay is exactly the same as the GPU frame output delay. Similarly, there is freesync technology launched by AMD. VR (variable update frequency) is the same as G-SYNC technology and freesync technology. It can be understood as preventing high-speed motion screen tearing or Carlton effect, ensuring that the game screen is smoother and the details are more complete.
  At the same time, HDMI2.1 also brings ALLM (automatic low latency mode). In automatic low-latency mode, smart TV users do not need to manually switch low-latency mode based on the content played on the TV, but automatically enable or disable low-latency mode based on the content played on the TV. In addition, HDMI2.1 also supports dynamic HDR, while HDMI2.0 only supports static HDR.

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