NVIDIA demonstrated the gameplay technology G-Sync.
Support for dynamic refresh rate was initially proposed to provide energy-saving modes. 18 frames per second (silent films) or 24, 30, 48 and so on. These monitors are already released, but the range of producers is very small . Developers of video cards can and should take advantage of this standard, according to AMD. The more it will cost nothing. Enough to update the BIOS and set the option in the driver control panel.
Why this step was not made by NVIDIA company ? According to AMD engineers , competitor graphics simply can not support variable frame rates, so they need additional fees in the monitor. As for AMD, then at CES 2014 the company demonstrated a laptop third generation, which reproduces technical demo with dynamic frame rate. Thereby, the company in practice confirms the possibility of free G-Sync.