Unlike larger-sized brethren, the Samsung UE49NU8000 uses a 60Hz rather than 120Hz panel, which limits its motion resolution, since no effective MCFI (motion-compensated frame interpolation) can be deployed for 50Hz/ 60Hz content.
The only way to increase motion resolution beyond the sample-and-hold baseline of 300 lines (according to the horizontally scrolling test pattern in Chapter 31 of the FPD Benchmark Software disc) is by engaging [LED Clear Motion] which activates backlight scanning. However, there’s significant double ghosting which makes it unappealing. Also, with 50Hz content, there’s forced frame interpolation with [LED Clear Motion] enabled, leading to noticeable interpolation artefacts. ”