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LG discontinues all UHD Blu-ray and Blu-ray players
(www.flatpanelshd.com)
This is a most excellent place for technology news and articles.
I store my entire Plex library on an old Dell t420 server which has an old spinning disk raid array and it performs well enough. And if you're able to direct play the files they you don't even need a strong CPU when hosting Plex, you can run it on a raspberry pi.