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Do you have a recommendation for something that's cheap and effective for what he wants? I've been looking at 980's, can he go lower than that or is that about where he needs to be?
From my experience your cpu just isn't good enough to handle it. Even if you stick a high end gpu in there. But speaking of what's put today even an 8th or 9th Gen i3 is good enough. Nothing on the FM2 socket that your dad has will ever come close to a cpu like that.
It mainly comes down to cpu, browser, and isp speed for the most part. Even onboard Intel 610/630 can playback 4K videos well enough if the cpu isn't too low end.
Changed the gpu to 980 Ti Hybrid and it barely makes a difference regarding video content such as youtube.
Once I got rid of Comcast and went to Fiber, it's much more doable and not a buffer fest.
Alternatively an APU with 2gb or more dedicated to it would be just as well.
So if you have an A8-5600 simply go to your BIOS (under Peripherals => GFX Configuration => UMA Frame Buffer Size) then set to the max (which should be 2gb) - hopefully you have at least 6gb, 4gb left over for the OS should be ok for an HTPC with nothing else running in the background
iGPU will take as much RAM as it needs withing the shared memory limits anyway, so cutting 2GB from RAM will make overall performance worse due to less RAM available for other tasks.
Yeah it's a smart TV, he's got a Netflix login he can use for 4k on it, it was his pc he was wanting to run in 4k though, he already has another 4k TV in the living room for all the other stuff
I only watch YouTube on my PC, not Netflix or Amazon Prime. For those I actually turn my PC off and use the Smart TV, even though my PC easily plays 4K.
The main reason is that the Apps have their own independent video playback and colour settings. On my PC I'd have to keep turning on HDR (or keeping it off for SDR) and turning off Game Mode on the TV. It's too much of a hassle.
Most 4K TV can handle YouTube/Netflix/etc. at 4K resolution without the need of other systems (PC/Nvidia Shield/etc.)
Anyway his PC itself is capable to display any video at 4K.
What interests you is NVDEC part of it. Youtube currently uses VP9 so you want that supported, or you can just go with something that supports everything like gtx1650. Again, performance of the card is irrelevant, it is integrated hardware video decoder and its characteristics that interest you.
There is software playback which depends on CPU and requires a lot of performance and hardware playback which simply uses small part built into GPU with near-zero CPU load. You tried with old cards which do not support modern formats => your player/browser falled back to using software decoding. Yes, you can brute-force it with modern fast multicore CPU, but it is kind of silly. Expensive, inefficient and depending on codecs used and their multithreading capabilities might still not be smotth. Any modern device like phones, smart tv-s, tv boxes and such use hardware decoders. And it makes sense to use it on PC too.
The main thing to watch for is HDMI 2.0 (a or b) minimum.