I think the reason is quite obvious: cost. If you spend more, you get better hardware.
The "j" series is Synology's absolute entry-level line. The DS218play and DS218 have the same CPU as the DS220j but have 1GB and 2GB RAM respectively. Of course, MSRP for those are $40-60 more. The DS220+ has $110 higher MSRP so naturally, it's going to be better than the "j".
Personally, I got the DS220j as a cheap entry to familiarize myself with Synology's software. I think I'll probably upgrade to either DS920+ or DS1520+ and relegate the DS220j as offsite backup or something.
The "j" series have weaker ARM processors. The Plus series have x86 64-bit Intel Celeron processors. The "j" series is no fun beyond being a NAS and some limited application functionality. I just upgraded my new x86 DS220plus with a total of 10 GB of RAM and it's a joy to use with tons of apps running compared to the "j" which barely manages a handful of them. I must also mention that the "j" and Play do not support support many apps that the x86 models like the Plus do).
I'm not sure whom the DS220play is intended for to be honest. It doesn't seem to be strong enough to support Plex.
The "j" series have weaker ARM processors. The Plus series have x86 64-bit Intel Celeron processors. The "j" series is no fun beyond being a NAS and some limited application functionality. I just upgraded my new x86 DS220plus with a total of 10 GB of RAM and it's a joy to use with tons of apps running compared to the "j" which barely manages a handful of them. I must also mention that the "j" and Play do not support support many apps that the x86 models like the Plus do).
I'm not sure whom the DS220play is intended for to be honest. It doesn't seem to be strong enough to support Plex.
It's DS218play so it's from 2018. Maybe they're just continuing to sell old stock. Mind, it's only the Plus and higher that have x86. The J and Value series have ARM. Also, I wouldn't be surprised if pricing is intentionally structured to get customers to "pay just a bit more" to upgrade to the higher end models.
As for Plex, none of the ARM-based NAS will work for Plex transcoding. They're fine for basic Plex server use as long as the playback client supports direct stream/play and the network is fast enough to support original bitrates.
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IMO this model is too slow for anything else.
NAS with 2 bays is always better than a single bay (Having a single drive is just begging for data loss).
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The "j" series is Synology's absolute entry-level line. The DS218play and DS218 have the same CPU as the DS220j but have 1GB and 2GB RAM respectively. Of course, MSRP for those are $40-60 more. The DS220+ has $110 higher MSRP so naturally, it's going to be better than the "j".
Personally, I got the DS220j as a cheap entry to familiarize myself with Synology's software. I think I'll probably upgrade to either DS920+ or DS1520+ and relegate the DS220j as offsite backup or something.
I'm not sure whom the DS220play is intended for to be honest. It doesn't seem to be strong enough to support Plex.
I'm not sure whom the DS220play is intended for to be honest. It doesn't seem to be strong enough to support Plex.
As for Plex, none of the ARM-based NAS will work for Plex transcoding. They're fine for basic Plex server use as long as the playback client supports direct stream/play and the network is fast enough to support original bitrates.