02-15-2021, 03:20 PM
DS1618+ and DS1819+ are the same NAS just different bays. It is slightly different to DS1019+ which is a weaker NAS performance-wise. If you do need transcoding option then DS1019+ will do a better job thanks to a GPU built inside the CPU. But for direct streaming, other two NAS should have no problems.I have prepared compatible RAM upgrades list here: https://nascompares.com/ram/ram-upgrade-for-rs820rp-rs820-ds2419-ds1819-ds1618-dva3219/DDR4 does make a difference. Shame that DS1019+ doesn't come with it.You can use SHR2 on a 4-bay. It will mean that two drives are used for redundancy and another two for available storage space.Also, all Synology models mentioned feature how to swap option and will automatically do a rebuilding process if you replace a drive.I hope this helps.