Good thread, I have been wondering for a few weeks now trying to get hold of a decent low end budget graphics card that can do 4K properly and when I say properly I mean with 4K @ 60fps with full HDR support with ALL the codec support in hardware and netflix 4K support (4gig+ required to be safe)
Its not easy, what AMD and nvidia have currently is old out of date technology cards such as the 1030 and 1050ti which is 3-4 years old they either lack 3 or 4gig to support netflix or don't have dual or decent outputs(DP 1.4+ or HDMI 2.0+), AMD have the RX550 2gig around £40-50 on flebay which is decent but again its 3-4 years old and does not support all the 4K hardware codec playbacks but its close, the one both Nvidia and AMD tend to miss is HEVC 4:4:4 full hardware playback.
see the Nvidia chart here:
https://developer.nvidia.com/video-encode-decode-gpu-support-matrix
Only budget card that seems to nail it properly is the Nvidia 1650 around £130-150 but Nvidia 1660 really does it all properly hardware video playback wise, AMD and Nvidia are releasing a set of new budget cards in the few weeks. So I am hoping we get some price drops or Nvidia 1650 super or AMD 5300XT pending release which hopefully supports all the full 4K video hardware playback codecs.
I would recommend waiting around a few more weeks if you can for the newer AMD and Nvidia cards, prices may drop or you may have better options and at least they will be up to date technology and hopefully more future proof, if you can't wait Nvidia 1030 or AMD RX550 cards of flebay for £50-60ish otherwise Nvidia 1650 @ £130 is close to perfect and Nvidia 1660 @ £180 which would do everything fully properly is a good option.