Synology RAM DDR4-2666 Non-ECC SO-DIMM 4GB (D4NESO-2666-4G)

Works flawlessly with the DS 720+. The cost is high for RAM but using another unapproved modul will cause problems. For example; shut downs, data lose, clicking HDDs. Outright system crashes and random freezing.

Its a good product so Id recommend this to anyone needing extra memory for a NAS drive, which all NAS drives need the extra memory. It is expensive though, so this is part of the price of NAS drive we often fail to take into account.

Decided to go with the pricier memory from Synology because I decided the cost savings by choosing another memory chip brand wasnt worth it. I just want something that works perfectly.

Used on my Synology DS220+. Install was a breeze, start up and NAS recognized with no issues. A little pricey but worth it.

The price of the memory is quite high for what it normally costs with third party vendors.

This was a great buy I caught a sale

The extra Ram might speed up your NAS for certain tasks, like video recording.

It does what it is supposed to do. Just a bit expensive due to its Synology branding and certification. Other brands of this spec likely would have worked just as well for a lower cost.

Easy to install and works great on my Synology Server

Yep. Its fast.