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Two green 288-pin DDR4 ECC UDIMM modules without heat spreaders

OWC

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

SKU CH-2DPW-E8C5G

Adds 32 GB of DDR4 2666 ECC UDIMM memory to Synology RS2421+ and RS2421RP+ systems

  • Capacity32GB (2 x 16GB)
  • Type288-Pin DDR4 ECC UDIMM
  • SpeedDDR4 2666 (PC4 21300)
  • CAS LatencyCL19
  • Voltage1.2V
  • ECCYes

Capacity 32GB (2 x 16GB)

  • ECC protection guards data integrity with built-in error correction
  • 32 GB total capacity delivered as two 16 GB modules
  • DDR4 2666 speed rated at PC4-21300 CL19
  • Validated for Synology RS2421+ and RS2421RP+ systems
  • Runs at 1.2 V with backward compatibility to 2133 and 2400 MHz

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.

Points forts

  • ECC protection guards data integrity with built-in error correction
  • 32 GB total capacity delivered as two 16 GB modules
  • DDR4 2666 speed rated at PC4-21300 CL19
  • Validated for Synology RS2421+ and RS2421RP+ systems
  • Runs at 1.2 V with backward compatibility to 2133 and 2400 MHz

Caractéristiques

BrandOWC
Part Number2E6D42R8032P
Capacity32GB (2 x 16GB)
Type288-Pin DDR4 ECC UDIMM
SpeedDDR4 2666 (PC4 21300)
CAS LatencyCL19
Voltage1.2V
ECCYes
Buffered/RegisteredUnbuffered
Rank2Rx8
Heat SpreaderNo
Compatible SystemSynology RackstationRS2421+
Synology RackstationRS2421RP+

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Questions sur cet article

How much power does the 1.2V DDR4 2666 kit draw when the Synology RS2421+ runs 24/7?

Each 16 GB module operates at 1.2 V, the standard DDR4 voltage, so total power scales with the 32 GB capacity and the NAS workload.

Does the 288-pin ECC UDIMM require a specific motherboard slot or BIOS setting on the RS2421RP+?

The kit is built to JEDEC PC4-21300 CL19 specs and fits the standard DDR4 UDIMM slots on the RS2421+ and RS2421RP+ with no extra configuration.

Will the 2666 MHz CL19 modules downclock reliably if I keep older 2133 MHz sticks in the same NAS?

Yes, the spec lists backward compatibility with 2133 MHz and 2400 MHz, so mixed-speed populations will run at the lowest common speed.

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