having a good gpu is important and a 1660 would be more then enough for 4k video playback i wouldnt recomend doing 4k over wifi id recomend a wired connection for best performance
as long as the hdmi port on the graphics card is 2.0a or higher it will handle 4k video a gtx 1660 has 2.0b
gaming wise just throwing this in there good 1080p card and entry level 2k
also a factor depends on your tvs inputs or monitor if using a monitor use one with display port
that being said most movies arent above 60 frames due to tv standards
chart below explains
HDMI Version | Max Resolution | Max 4K Frame rate | HDCP 2.2 | HDR | WCG | Hybrid Log Gamma | Dynamic Metadata |
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1.4 | | | | | | | |
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