Relevant redit thread is here
The goal of this build was to create a future-proof Plex server for use by myself, friends, and family. That is, have enough power for multiple streaming sessions without having a single user sacrifice quality due to other users on the system. Initially I was looking at the core i5 range - but that would only get me a 6,000 - 8,000 passmark score. I use this benchmark as the main developers of plex state that you should have 2000 passmark "points" per stream.
So then I went into the deep dark that is used server parts, and arrived at the following:
2x SR0KK E5-2660 2.2ghz 8-core Xeon processors Supermicro X9DRL-IF-O Dual LGA2011/ Intel C602 *32GB of DDR3 ECC (because it's so damn cheap on the used market)
That's two 95w chips (with associated memory), which amounts to a total passmark score of 17,040.
I waited for ryzen, as I wasn't sure about buying used parts - boy am I glad I did. I can get a score of 15,000 from just this one 65w chip with a mild overclock (3.8ghz), with 1/4 the amount of memory modules installed (8GB).
The only data drive I have attached here is a 5TB WD green - which is not ideal at all. Luckily I just recently took a job with a great company and will soon be able to upgrade this to 4x 4TB WD red drives in a raid configuration - something the SuperMicro S5 Platinum is ideal for.