Synology - DDR4 - module - 16 GB - DIMM 288-pin - 2666 MT/s / PC4-21300 - 1.2 V - registered - ECC - for Synology SA3400, FlashStation FS3400, FS6400

Product Overview

AI-generated summary

At £680 ex‑VAT for 16GB of DDR4 ECC registered RAM, this is one of those “good hardware, brutal pricing” purchases. If you’re running a Synology SA3400/FS3400/FS6400 and you genuinely need more memory for performance or stability, the Synology-branded/compatible ECC route is sensible: it reduces the risk of wonky behaviour under load and keeps the box in the configuration it was validated for. In day-to-day terms, more RAM helps more with disk-heavy workloads, larger SMB/NFS concurrency, and caching/analytics-style tasks—especially if you’ve got virtualisation, heavy indexing, or lots of active users.

But I wouldn’t buy this blind just because “more memory = faster”. For most teams, the cost per usable performance gain here is steep; you need to know you’re already memory-constrained (and that the system is actually utilising RAM rather than sitting with plenty spare). Also, if you’re considering “cheaper equivalents”, be careful: mismatched timing/registration/ECC behaviour can be more hassle than it’s worth on Synology systems. Bottom line: buy it only if your unit is confirmed to benefit from more RAM and you’ve checked current utilisation; otherwise, you’ll probably get better ROI by tuning workloads or looking at other bottlenecks before paying this premium.