I have no idea what you're talking about. have plex on my beefy Linux PC and before that was using a Mac with an Intel i7. unless you need to transcode you can use what ever ancient hardware you have, there are people using raspberry pi's for running plex/jellyfin
I guess it really comes down to:
1. How much content are we talking about?
2. How many people use your server?
Yes, QuickSync is amazing but hard drives alone (for a larger collection) are incredibly expensive (today). Even before prices shot up I know people that sunk $8K+ into hard drives alone.