Cheap 4K HDR T.V. sets with 8 bit panels. How they resolve HDR and WCG?

[eddievanhalen]

I've seen plenty of cheap (or reasonable priced) 4K HDR T.V. sets lately, mainly from Samsung and LG. All those T.V.'s have 8 bit panels. How those sets with 8 bit panels resolve HDR? Are there any real improvement over a 4K non-HDR set or the improvement is just subtle?
What about Wide Color Gamut? I understand that in order to play WCG the set must have a 10 bit panel as 4K HDR video bit depth is 10, which is what gets WCG. How those cheap HDR T.V. set perform WCG, if they even do it. Maybe they downrez video signal to 8 bit adding dither to get a better result.
Thanks in advance for your input.