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Two green DDR4 RDIMM modules with gold contacts, no heat spreaders

OWC

OWC 32GB (2x16GB) DDR4 2666 ECC Registered RDIMM FS6400 HD6500 server RAM

SKU CH-BSCD-ZEXYP

32 GB dual-channel DDR4 ECC registered RDIMM kit running at 2666 MHz CL19 for Synology FS6400 and HD6500 servers

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

Capacity 32GB (2 x 16GB)

Rank 2Rx4

  • ECC registered design prevents data corruption in servers
  • 32GB dual-channel kit with two 16GB modules
  • DDR4 2666MHz CL19 speed with 1.2V operation
  • JEDEC and RoHS compliant for warranty-safe upgrades
  • Compatible with Synology FS6400 and HD6500 NAS systems

Server ECC Registered Memory Upgrade

This kit provides 32GB of DDR4 ECC Registered memory in two 16GB modules. It is built for servers, workstations and NAS systems that require registered DIMMs. The modules run at 2666MHz with CL19 latency at 1.2V. They will not work in standard desktop computers or alongside unbuffered or load-reduced memory.

Registered DIMM Platform Constraints

The 288-pin registered design only fits platforms that support ECC Registered DDR4. Mixing with unbuffered or load-reduced modules is not supported. The memory operates at 2666MHz and is backward compatible with 2133MHz and 2400MHz systems. Buyers who need unbuffered ECC or non-ECC memory for consumer boards cannot use this kit.

Two-Module Installation Notes

Installation follows standard DIMM slot procedures for the target server or NAS. The dual-channel kit should populate matching channel slots for best performance. Common issues include inserting modules into unsupported slot populations or mixing with incompatible memory types. The lack of heat spreaders means airflow across the modules is important in dense chassis.

Highlights

  • ECC registered design prevents data corruption in servers
  • 32GB dual-channel kit with two 16GB modules
  • DDR4 2666MHz CL19 speed with 1.2V operation
  • JEDEC and RoHS compliant for warranty-safe upgrades
  • Compatible with Synology FS6400 and HD6500 NAS systems

Specifications

BrandOWC
Part Number2R6D42R4032P
Capacity32GB (2 x 16GB)
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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Questions about this item

Should I choose the 32 GB dual-channel kit or buy single 16 GB modules for my Synology FS6400?

The 32 GB kit provides two matched 16 GB modules (2R6D42R4032P) that run together in dual-channel mode, giving the full bandwidth the FS6400 expects. Single modules would work but lose the paired-channel benefit.

What does the PC4-21300 2666 MHz rating actually deliver inside a FS6400 or HD6500?

The modules operate at 2666 MT/s with CL19 latency at 1.2 V, providing the peak transfer rate the Synology D4RD-2666-16G and D4ER01-16G slots are designed for. The system will clock them at 2666 MHz unless the platform forces a lower speed.

How does the ECC registered DDR4 interface limit what I can install alongside these DIMMs?

These are 288-pin ECC registered DDR4 RDIMMs (2Rx4). They must not be mixed with unbuffered or load-reduced ECC modules, and the memory controller will only accept registered ECC DIMMs in the same channel.

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