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Two green 288-pin DDR4 RDIMM modules without heat spreaders

OWC

OWC 2R6D42R4064P 64GB (2×32GB) DDR4-2666 CL19 ECC Registered RDIMM server RAM

SKU CH-9RW3-E99D4

64GB dual-channel DDR4-2666 ECC registered RDIMM kit for Synology NAS and servers

  • Capacity64GB (2 x 32GB)
  • Type288-Pin DDR4 SDRAM
  • SpeedDDR4 2666 (PC4 21300)
  • CAS LatencyCL19
  • Voltage1.2V
  • ECCYes

Capacity 64GB (2 x 32GB)

Rank 2Rx4

  • ECC registered design protects data integrity in servers
  • 64GB dual-channel kit (2×32GB) expands NAS memory capacity
  • DDR4-2666 CL19 at 1.2V matches JEDEC standard specs
  • Compatible with Synology SA3400, SA410, SA3600, SA3610 NAS systems
  • Backward compatible with 2133MHz and 2400MHz DDR4 speeds

Server-grade ECC registered DIMM kit

This 64GB dual-channel kit delivers two 32GB DDR4-2666 registered modules with ECC error correction for Synology NAS models SA3400, SA410, SA3600 and SA3610. It replaces OEM parts D4RD-2666-32G and D4ER01-32G and runs at 1.2V with CL19 latency. The registered design makes it unsuitable for standard desktop motherboards.

Sustained-load reliability with registered buffering

The 2Rx4 registered architecture places a register between the DRAM and the memory controller, reducing electrical load during continuous operation. ECC circuitry detects and corrects single-bit errors in real time, preventing data corruption during long compute or storage tasks. Backward compatibility with 2133MHz and 2400MHz platforms allows the kit to clock down automatically when installed in slower systems.

JEDEC-compliant 288-pin modules without heat

Each stick conforms to JEDEC and RoHS standards, ensuring a warranty-safe upgrade for supported servers and workstations. The bare 288-pin PCB fits densely populated DIMM slots where tall heat spreaders would block adjacent modules or airflow. Buyers needing unbuffered ECC, load-reduced DIMMs or consumer desktop memory should look elsewhere.

Puntos fuertes

  • ECC registered design protects data integrity in servers
  • 64GB dual-channel kit (2×32GB) expands NAS memory capacity
  • DDR4-2666 CL19 at 1.2V matches JEDEC standard specs
  • Compatible with Synology SA3400, SA410, SA3600, SA3610 NAS systems
  • Backward compatible with 2133MHz and 2400MHz DDR4 speeds

Especificaciones

BrandOWC
Part Number2R6D42R4064P
Capacity64GB (2 x 32GB)
Type288-Pin DDR4 SDRAM
SpeedDDR4 2666 (PC4 21300)
CAS LatencyCL19
Voltage1.2V
ECCYes
Buffered/RegisteredRegistered
Rank2Rx4
Multi-channel KitDual Channel Kit
Heat SpreaderNo

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Misma familia, con memoria, disipador o frecuencia diferentes — compare antes de decidirse.

Preguntas sobre este artículo

How much power does the DDR4-2666 1.2V ECC registered kit draw when running continuously in a NAS?

Each 32 GB module operates at 1.2 V, the standard DDR4 voltage, so power draw stays at the JEDEC baseline for registered DIMMs.

What must my Synology NAS already have to accept this 2×32 GB RDIMM kit?

The NAS must provide 288-pin DDR4 slots that support ECC registered memory; the kit replaces Synology D4RD-2666-32G and D4ER01-32G modules in SA3400, SA410, SA3600 and SA3610 units.

Will these CL19 2666 MHz sticks work alongside older 2133 MHz or 2400 MHz ECC registered DIMMs I keep installed?

Yes, the modules are backward compatible with 2133 MHz and 2400 MHz speeds, and all sticks will run at the lowest common frequency when mixed.

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