D4ES04-4G Synology 4GB DDR4 Ram Module – ECC Unbuffered SODIMM
D4ES04-4G Overview
The Synology D4ES04-4G is a specialized 4GB DDR4 memory module specifically designed to expand the capacity and enhance the stability of Synology DiskStation and Rack Station NAS servers. Operating at 2666MHz (PC4-21300), this 260-pin SO-DIMM is optimized for high-performance data management in professional and small-business environments. As an ECC Unbuffered (ECC UDIMM) module, it provides a critical layer of data protection by detecting and correcting single-bit memory errors—essential for maintaining the integrity of stored files and preventing system crashes during 24/7 operation. Running at a power-efficient 1.2V, it is tailored for the specific hardware architectures of the 21-series through 25-series models (such as the DS925+, DS1821+, and RS1221+). This genuine Synology upgrade ensures full manufacturer compatibility and unlocks the reliable throughput required for intensive NAS workloads like virtualization, backup synchronization, and media streaming.
$299
D4ES04-4G Technical Specifications
Synology 4GB DDR4 Ram Module – ECC Unbuffered SODIMM
Brand : Synology
Capacity : 4GB
Memory Type : DDR4 SDRAM
Speed : 2666MHz (PC4-21300)
Error Correction : ECC (Error-Correcting Code)
Buffered/Unbuffered : Unbuffered
Module Type : SoDIMM
Pin Count : 260-Pin
Voltage : 1.2V
Compatibility : Synology NAS Servers (e.g., DS1621+, DS1821+, RS1221+ series)
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