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+--- Thread: RS1221+ Memory (/showthread.php?tid=12206)
RS1221+ Memory - Enquiries - 08-02-2025
Hi. Read your article regarding unofficial memory upgrades. Just got my RS1221RP+ a couple days ago but yep, only 4gb of memory installed. I'm interested to know how the gear will react if I installed the two 32gb Kingston memory modules. I have never exceeded the listed capacity of a piece of equipment and being able to do this would be a real plus. My son is putting together a AI system that requires a large amount of memory & being able to allocate half of the 64gb of memory into a vm for him would be ideal. I am by no means a hardware expert but seems installing non-ecc memory would defeat the internal process programmed into this NAS but, if it is still a good option as indicated by at least one persons comments then I'm willing to go at it as well. Let me know if you would please.
RE: RS1221+ Memory - ed - 08-02-2025
Regarding the memory upgrade, yes, despite Synology officially capping support at 32GB (2 x 16GB ECC), many users — including some of our own tests — have successfully installed 2 x 32GB DDR4 ECC SODIMMs for a total of 64GB. The system will typically boot and recognize the full capacity, and performance has remained stable in most real-world use cases, especially for VMs and Docker workloads.
Just make sure the memory you use is DDR4-2666 ECC SODIMM (not UDIMM or non-ECC), ideally from a reliable server-grade line like Kingston’s KSM series (e.g., KSM26SED8/32HD). Non-ECC memory often won’t boot or can lead to instability due to Synology’s stricter BIOS-level checks on the RS models. ECC is strongly recommended here.
So in your case — yes, you can absolutely try the 2 x 32GB modules, and if all goes well you can assign 32GB+ to your son’s AI VM without issue. The RS1221+ won’t complain as long as the memory matches spec and passes POST.