Well, I'm cheap (AND I honestly don't know that much about Plex), so I'd probably just download the Plex plug-in for FreeNAS, since one exists and I already have a box set up running FreeNAS.
BUT if I wanted a more turnkey NAS that I knew would support Plex out of the box AND had some room to grow? One that prioritized the goal of storing and consuming media above that of long-term archival storage? I'm guessing it would probably come down to a choice between one made by Synology or QNAP. Only problem is, since SOHO boxes usually ship with anemic processors, transcoding 4K footage is going to be an issue. Some of them have built-in hardware assistance, but that's something that will only work with whichever specific codecs are built into the hardware, meaning if your device requests any codec that's
not built in, it might stutter or just drop out entirely. Not a big problem right now, but HEVC/H.265 is growing in popularity, and will no doubt replace H.264 someday. Also, turns out the version of Plex that supports hardware transcoding costs extra money anyway.
THEREFORE I would choose one whose processor is capable of transcoding in
software, since all it takes to add new codecs in software is just to update that software. I would also pick a NAS that's relatively new so that it's not in danger of being discontinued/unsupported any time soon. Consulting
the Plex people's compatibility list, there are not very many that can decode 4K UHD HDR
in software. In fact, there are only three, all made by QNAP:
QNAP TS-877-1700 (Ryzen 7 1700) - US$2500
QNAP TVS-882BRT3-i7 (Core i7-7700) - US$2700
QNAP TVS-1282T/1282T3-i5/i7 (Core i5-7500/i7-7700) - US$3700-4500
These prices are all
without any drives installed, by the way. Clearly, if I want something I can actually afford, the solution is either going to be to noticeably lower my standards, or else roll my own. But since this is an exercise in choosing an off-the-shelf solution, I will continue to ignore the DIY side of things. So how low can I go? A quick check of the ones that can decode 4K UHD SDR still puts those at or near US$2000, but I'm looking for something closer to $1500* (or lower), so it looks like we're going to be looking only at the ones that say they can do 1080p in software. Hardware assist would be nice, but again since it is an extra cost (to upgrade Plex), I will not consider it essential.
Most people have sizable libraries of media, so I will also not even look at any NAS with less than 4 bays, preferably not less than 6. I'm also not going to consider any NAS that only ranks "some" in software decoding of 1080p. It must be a full "yes."
Ah,
now we're getting into the sub-US$1000's-ish. Again, sticking with only the models on the Plex list:
Asustor AS-4004T - US$450 - Wow what a price!
QNAP TVS-473e - US$1050 - BUT...
QNAP TVS-673e - US$1100 - Same as the above but you get 2 add'l bays for under $100 more.
Pretty much every other NAS in the list was either too expensive, didn't have enough bays, was too old, or got passed over for some other reason. I really wasn't expecting to narrow the list down to so few, and I was expecting there to be more of a fight between models from Synology and QNAP, but either the Plex people just haven't tested enough Synology NASes yet, or else Synology's lineup is too focused on business use instead of SOHO/Personal.
So based on all this, I guess the QNAP TVS-673e is the one to compare everything else against, with the Asustor as a dark horse competitor based solely on its remarkably low price. There is the VERY REAL possibility that manufacturers have released newer models that have not yet made it into the Plex compatibility list, and that I therefore could not compare. If so, check their hardware specs against other similar models that
are on the Plex list to get some idea what they're capable of. One NAS with a Core i7-7700 performs much like any other with the same processor, and in the case where the CPU has been upgraded or changed in the newer model, there are sites like
Passmark's CPU pages where you can estimate how much difference the new CPU might make.
--Patrick
*I know I said I'm going to avoid the DIY method, but once the price goes noticeably over $1500, it REALLY starts to make more sense to roll your own if you don't need integrated hardware.