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Green circuit board with black memory chips and gold edge connector

Synology Inc.

Synology Inc. D4ES01-4G 4GB DDR4 ECC SO-DIMM memory upgrade

SKU CH-SHMF-7G24M MPN D4ES01-4G

4GB DDR4 ECC SO-DIMM module for compatible Synology 21-series NAS systems

  • Capacity4GB
  • Type260-Pin DDR4 SO-DIMM
  • ECCYes
  • Buffered/RegisteredUnbuffered
  • Compatible SystemSynology 21 series: RS1221RP+, RS1221+, DS1821+, DS1621+
  • ECC protection guards data integrity on compatible Synology 21 series NAS
  • 4 GB capacity adds responsive multitasking headroom for demanding workloads
  • 260-pin DDR4 SO-DIMM form factor fits the approved memory slots exactly
  • Unbuffered design keeps latency low for snappy system response
  • Validated for RS1221RP+, RS1221+, DS1821+ and DS1621+ models

Synology 21-series ECC SO-DIMM

This 4 GB DDR4 module is built for Synology 21-series NAS units including the RS1221RP+, RS1221+, DS1821+ and DS1621+. It adds error-correcting memory to systems that support ECC, helping maintain data integrity during continuous operation. The unbuffered design matches the memory controller in these models.

260-pin DDR4 form factor

The stick uses the standard 260-pin SO-DIMM layout, so it slots directly into the memory socket on the compatible Synology mainboard without adapters. ECC circuitry works transparently once installed, and the unbuffered signalling keeps latency low for the workloads these appliances run. No extra configuration is required beyond seating the module firmly.

Upgrade from non-ECC or lower capacity

Owners of the listed 21-series units who currently run non-ECC memory or a single smaller module can install this kit to gain error correction and additional headroom. The jump is worthwhile when the NAS handles critical file services, virtualization or backup tasks where silent data corruption is unacceptable. Systems not in the 21-series compatibility list cannot use this module.

Pontos fortes

  • ECC protection guards data integrity on compatible Synology 21 series NAS
  • 4 GB capacity adds responsive multitasking headroom for demanding workloads
  • 260-pin DDR4 SO-DIMM form factor fits the approved memory slots exactly
  • Unbuffered design keeps latency low for snappy system response
  • Validated for RS1221RP+, RS1221+, DS1821+ and DS1621+ models

Especificações

BrandSynology
Part NumberD4ES01-4G
Capacity4GB
Type260-Pin DDR4 SO-DIMM
ECCYes
Buffered/RegisteredUnbuffered
Compatible SystemSynology 21 series:
RS1221RP+, RS1221+, DS1821+, DS1621+
Peso de envio0.05 kg
Dimensões da embalagem127 × 91 × 13 mm

Perguntas sobre este artigo

What DDR4 SO-DIMM standard does the 260-pin D4ES01-4G use, and what speed ceiling does that impose?

The module follows the 260-pin DDR4 SO-DIMM standard, so its transfer rate is limited by the DDR4 specification and the memory controller of the Synology 21-series NAS it is installed in.

Which physical slot and form factor must the NAS provide for this 4GB stick to seat correctly?

It requires a standard 260-pin DDR4 SO-DIMM slot, as found in the RS1221RP+, RS1221+, DS1821+ and DS1621+ models listed for the 21 series.

What is the correct insertion method for this ECC unbuffered module, and which step do installers most often miss?

Align the notch on the module with the key in the SO-DIMM slot, press firmly until the side clips click into place, and verify the clips are fully latched — the step most often missed is confirming both clips have engaged.

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