It's not that I must use that PC it's was just pointed out how these refurbs are great options for personal servers.
It depends on what you want to use it for. A general backup server, sure. A plex machine for a single viewer? Yeah. Web or shared plex? 4th Gen i3 and DDR3 will fall flat on its face.
Both a media server for streaming and a file server for personal files when I'm out and about. Not one will access it but me.
What generation CPU would you suggest for ability to down-encode fro 4k/2k/1080p to 1080p / 720p at a sufficiently fast speed to be used as a streaming server?
Just use clients that have enough power to direct-play the content on their own. Let the display handle the 4K to 1080p downconvert on its own (most displays can do that, since it's just a matter of halving the horizontal and vertical scales). At that point, it's just a fileserver with a fancy catalog.
You want an NVIDIA 1050Ti for hardware transcoding of multiple streams, and then you'll want to run it on Ubuntu, not Windows. CPU Encoding is not where its at. Set your max stream rate to something like 8mbs to get good 1080p streaming. Also, if anything is in H265 format, CPU transcoding is pretty much a no-go. You need GPU-based transcoding.
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