On the Intel side, I believe Quick Sync Video v6 is needed, included with Kaby Lake, Coffee Lake and Whiskey Lake CPUs.
Of those three microarchitectures, I believe the cheapest CPU is the £75 Intel Core i3-7100 (Kaby Lake). Could such a £75 CPU handle a 4K HEVC Main 10 HDR transcode, even though it has QSV v6?
I believe without QSV v6 support, you’d need a CPU with a PassMark CPU score of around 17,000 to brute encode it.
What would be required on the AMD side?
amd cpu? about the same, per transcode.
do note, its not the encoding that is the bottleneck, it is the DECODING of x265/hevc.
plex does not encode TO x265/hevc, it encodes to x264, which is relatively easy (cpu have been doing that for years now).
you should also read the entire thread @ Plex, 4k, transcoding, and you
the point of having high quality 4k content, is not to transcode it to lesser quality, its to avoid transcoding and direct play it.
finally, hardware transcode requires plex pass, so you will want to take that into consideration in whatever your final solution is.
You will also have to consider the number of trans codes that maybe required. Then again you can limit that issue by a server setting.
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