Because 3K is not a standard release format, some 3K files might have a lower bitrate compared to high-quality 4K or even premium 1080p releases, leading to artifacts in dark scenes.
Typically 2880 x 1620 or 3200 x 1800 pixels (approx. 4.6 to 5.7 million pixels) 3k movies download better
A generally means you are downloading a video file encoded at a resolution higher than but lower than 3K vs. 1080p vs. 4K: The Breakdown Because 3K is not a standard release format,