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OWC

OWC 32GB (4×8GB) DDR4 2666 ECC Registered RDIMM server RAM

SKU CH-Z4GW-04A6E

32 GB DDR4-2666 ECC registered RDIMM kit of four 8 GB modules for Synology FS6400 and HD6500 NAS

  • Total capacity32 GB (4 × 8 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • CAS latencyCL19
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank1Rx4

Capacity 32GB (4 x 8GB)

Rank 1Rx4

  • ECC registered design protects data integrity in servers and workstations
  • 32 GB kit (4 × 8 GB) expands memory capacity for demanding workloads
  • DDR4 2666 MHz CL19 at 1.2 V delivers rated speed with standard voltage
  • JEDEC and RoHS compliant for warranty-safe upgrades
  • Backward compatible with 2133 MHz and 2400 MHz systems

Target system

This 32GB kit provides four 8GB DDR4 2666 ECC registered RDIMMs built for Synology FS6400 and HD6500 NAS units. It replaces the D4RD-2666-8G and D4ER01-8G modules in servers and workstations that require registered memory. It will not work in standard desktop PCs or with unbuffered or load-reduced DIMMs.

Thermals and power

Each module runs at 1.2V with CL19 latency and has no heat spreader. The registered buffer adds a clock cycle for signal integrity in multi-DIMM configurations. Power draw scales with the four-module population and the 2666 MT/s data rate.

Compatibility and standards

The kit is JEDEC and RoHS compliant and backward compatible with 2133 and 2400 MT/s operation. It is validated for the FlashStation FS6400 and HIGH Density HD6500 platforms. Buyers needing unbuffered ECC or consumer SO-DIMM form factors cannot use this product.

How it compares

Measured against everything we stock in ECC Server RAM, at today’s prices. Recalculated every night.

Price $301.99
Pricier than about 61% of the 6,523 comparable items (median $188.99).
Total capacity 32 GB (4 × 8 GB)
Typical for this category: the median of 6,064 items is 32 GB.
Price per GB $9.44 per GB
Pricier than about 65% of the 6,064 comparable items (median $7.25 per GB).

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Specifications

Product
Brand nameOWC
Part number2R6D41R4032S
Total capacity32 GB (4 × 8 GB)
Product type288-Pin DDR4 SDRAM
Performance
Rated speedDDR4 2666 (PC4 21300)
Memory
CAS latencyCL19
ECC supportYes
Buffer typeRegistered
Memory rank1Rx4
Kit configurationDual Channel Kit
Heat spreaderNo
Power
Rated voltage1.2 V

Other versions of this model

5 more in the same range

Questions about this item

How do I install the four 8 GB DDR4 2666 registered DIMMs in my Synology FS6400, and what step is often missed?

Power down the NAS, open the chassis, and seat each 288-pin module until the retention clips click; the step most people miss is populating all four slots so the dual-channel kit runs at full width.

What maintenance or replacement will this 32 GB ECC registered kit need over time?

No routine maintenance is required; if a module ever fails, replace it with another DDR4 2666 CL19 1.2 V 1Rx4 registered DIMM to keep ECC protection intact.

What limit appears first when the memory runs under sustained load in a server?

The CL19 latency at 2666 MT/s sets the bandwidth ceiling; sustained workloads will hit that timing wall before voltage or temperature become factors.

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