After tedious days of research and reading tons of forums and spreadsheets I still have no answer to what bothers me.
I'm currently building a small, inexpensive power efficient NAS unit to serve as a backup machine and media server. The difficulty is it has to be able to transcode my full blown bluray rips (1080p24 h.264 files with 40-50 mbit) in real time down to 6-10 mbit 1080p h264 as well as lower rosolutions for the client side while direct streaming up to 4K (latter should be not taxing at all). Don't have a plex pass for hardware-accelerated transcoding, not bying one. If I wanted hardware transcoding via Intel QuickSync I'd buy the overhyped PR4100 NAS. But I'm a sucker for quality and the PR4100 seems to use very low quality "superfast" preset for hw transcoding. Couldn't find any decent NAS capable of 1080p high bitrate software transcoding. On the PLEX support side it recommends a CPU with 4000 passmark score for single 1080p transcode, of 10 mbit source that is. However on the same site it states "Intel Core i5 3.0 GHz minimum". Doesn't state the generation though and a lot has changed in the past 2-3 years with Skylake and Kaby Lake architectures.
For my limited budget, will a Pentium G4560 with 4900 Passmark Score do the job of 1080p 50 mbit --> 10 mbit live transcoding?
Or is an i3 7300 (7100 passmark score) / i5 7500 (8100 passmark score) necessary for veryfast transcoding preset? Unfortunately I don't have the budget for double 36 core xeons / Core i9 or nor Threadripper. Idle consumption of the NAS has to be low but it must handle 1080p h264 50 mbit transcoding at the minimum. I'm really interested of what you guys are using for Plex Media Server transcoding and how it performs for you. Maybe AMD Ryzen APU is the way to go for Plex?