So, I've had some arguments in the family due to a very old laptop that's being used for watching movies on a 4k TV. It's hard for my family to understand that the video stuttering and lagging they are experiencing during a movie is due to the very old and severely outdated hardware they are using to watch movies from and it's much easier for them to point fingers at me and to blame me for being the one that decided to ditch the old internet contract which had <20Mbps and get a contract with Virgin Media and an internet speed of >300Mbps.
Now I want to fix this problem and I not only want to build a PC that can easily do this, but also be capable of 4k Blu-Ray playback since the TV is 4k, so this is where I need help with suggestions. This will mark the first HTPC I build and I want to do it right the first time in a form-factor as close to that of a console as I can get it. I've done some research online and I couldn't find a conclusive answer as to what is the minimum GPU requirement to be able to play 4k Blu-Ray. Also, if any of you can come with a better suggestion for a case that would be very appreciated since the one I've picked doesn't have very good ventilation.
This is the build so far:
with this ram:
and this keyboard: