Hittade inget om 4K på Synologys hemsida, så googlade lite och hittade denna artikel...
https://nascompares.com/2020/02/24/synology-ds420j-nas-review...
...When this RTD1296 CPU has been featured on previous NAS drives from Synology (the DS418, DS218, DS819 to name a few) we have seen it support Plex Media server, 15-20 cameras in Surveillance station, BTRFS as a file system, 4K Support and more. However, this it is a VERY DIFFERENT story with the Synology DS420j, as that 1GB DDR4 limit is going to prevent a number of these software packages being able to run.
BTRFS Support: No
Synology Hybrid RAID: Yes
Snapshot Support: Limited/None
4K Support: No/Limited
Transcoding Support: No
Synology Multimedia Support: Photo Station, Moments, Video Station, Audio Station
Synology Drive: Yes
Synology Chat: Yes, 10 Users
Synology Active Backup: No
Synology Surveillance Station: Yes, 16 Cameras at 720p h.264 (2 Licenses inc)
Synology Virtual Machine Manager: No
Synology High Availability: No
Synology Mail/Mail Station: Yes
Synology Office: Yes, online
Synology Download Station: Yes, 80 Jobs at Once
Docker: No
Synology CMS: Yes, Limited
Hyper Backup: Yes! (Thanks to Balazs for this update)
Plex Media Server: No/Limited
iTunes Server: Yes
WordPress: Yes
