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you may need to use a dvi -> hdmi adapter or cable since its hdmi is 1.4
However, believe it or not, you can run 1920x1080 on a 4K Display and then still change the YouTube video playback to 4K/2160p if availble. It will still look better, more crisp and detailed then the same video at 1080p.
Running a desktop at 4K windows res all the time is going to make that entire PC always slow, especially given the cpu you have.
Yes, 4K/24 fps is perfect for movies, 30 fps should be enough to watch videos.
60 fps are required to play well but since his father won't do it he should be fine.
Maybe 720/60 and 1080/60, sure.
60 fps videos require much better hardware to have it run smoothly anyways.
All it requires is GPU with hardware decoder for specific format built in and appropriate output port.
The rest of the system does not matter, might as well be lga775 celeron with 2 gigs of ddr2 or something.
Even most SoC-s used in modern phones/tablets can decode 4k@60 in most popular formats. While running on ~20wh battery.
It uses both cpu and gpu.
Even youtube in Chrome with hardware acceleration on needs both your cpu and gpu. It doesn't just use amd/nvidia decoding.
His dad's pc is fine for 1080p playback, but for 4k, lol. Just nope. I only do this for a living, wtf do I know right. Good lord.
His dad already tried current pc with 4k playback and isn't happy. Well no kidding. Cause those pc specs are crap for that. Even a 6th gen Pentium would stomp those current pc specs onto the ground. And gtx 460 is quite weak to be honest. GTX 750 Ti / 950 / 1050 would run circles around that 460. GTX 460 is barely good enough for 1080p/60 videos. Yes modern phones and tablets even cheap ones are more powerful then his dads PC specs.
Videocard performance has zero relevance.
CPU is used obviously for secondary tasks like running browser, reading conrtainer/stream and such, but it does not decode video and it does not require much performance.
Google what hardware video decoder (or encoder) is.
Phones and tablets are not more "powerful", they are completely incapable of decoding 4k video in software. They just have separate piece of silicon which does it. The same as modern videocards. And yes, it is separate piece of silicon, does not use actual gpu to do decoding.
So, 6% load on i5-2500 during the 8K video playback. But most of that load doesn't even come from the playing video, rather running browser.
So much CPU needed, wow. Much performance.
some player/codec use cpu to decompress/scale instead of the gpu
You can do that two ways, hardware acceleration left enabled which uses much less cpu and mostly gpu. Or disable it if you have a very strong cpu and it will do that better in some situations.
The performance impact of a 4K or higher video will also depend on a few factors. Like the screen res you actually run. If you run the OS desktop at 2160p vs 1080p it will require better cpu and gpu. As opposed to say, desktop res at 1080p while running your videos at 4K, which yes you can do. They will still look better then running that same video at 1080p
Best bet of gpu replacement that isn't still to old and still can utilize current drivers would be something like gtx 950 minimum
My aged gtx 780 had no issues handling 1080p bluray ripped mkv encoded with h265
And what does any of that have to do with netflix, Disney+, hulu, youtube?
Your browser handles all that and the videos are via html5