02-11-2021, 03:01 PM
Synology DS418play is a good NAS and it will cope with local Plex streaming as well as surveillance. Adding extra RAM will also help. You will be able to run even more apps simultaneously. Ad some of that RAM might be used for internal caching.Adding cache card will not be possible though since it does not have a PCIe slot to connect it to. You can not use external drives for caching. But you can use one or more od the bays for SSD which can be set up as caching drive. This would help and would work very similarly like M2D18 card. You would still have 3 drives in SHR which give you most capacity available with a redundancy enabled.But if you do want to benefit from NVME speed cache with M2D18 card then you will need to consider DS1618+ or DS1819+. Or a Qnap like TS-453Be.I hope this helps.