OWC 32GB (2x16GB) DDR4 2666 ECC UDIMM for Synology RS2421+ RS2421RP+ memory upgrade

Synology RackStation RS2421+ memory kit

This 32 GB kit contains two 16 GB DDR4 ECC UDIMMs validated for the Synology RackStation RS2421+ and RS2421RP+. Each module runs at 2666 MHz with CL19 latency and operates at the standard 1.2 V. The unbuffered design fits the 288-pin slots in these NAS units without requiring registered memory support.

Sustained operation with ECC protection

Error-correcting code detects and corrects single-bit errors during continuous workloads such as file serving, backup jobs or virtual-machine hosting. The 2Rx8 organisation keeps signal integrity stable across all ranks when the system runs at full capacity for extended periods. JEDEC-standard timings ensure the modules maintain rated speed without throttling under load.

DDR4 2666 interface limits

The PC4-21300 rating defines the maximum transfer rate for this memory standard; the kit will not exceed 2666 MHz even if the platform supports higher speeds. Backward compatibility allows the modules to down-clock to 2133 MHz or 2400 MHz when installed in older compatible systems. Builders needing registered DIMMs or capacities beyond 32 GB must select a different memory type.