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Four green DDR4 RDIMM modules with gold contacts and black chips, no heat spreaders

OWC

OWC 64GB (4x16GB) DDR4 2133MHz CL15 ECC Registered RDIMM 1.2V 288-pin Server RAM

SKU CH-9D3A-VKEZA

ECC Registered DDR4 kit adds 64GB across four 16GB modules at 2133MHz CL15 for servers and workstations

  • Total capacity64 GB (4 × 16 GB)
  • Rated speedDDR4 2133 (PC4 17000)
  • CAS latencyCL15
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank2Rx4

Capacity 64GB (4 x 16GB)

Rank 2Rx4

  • ECC protection prevents data corruption in servers
  • 64GB total capacity across four 16GB modules
  • Registered design ensures signal integrity under load
  • 2133MHz DDR4 speed meets PC4-17000 standard
  • 2V operation reduces power draw and heat

Server Memory Kit

This OWC kit provides 64GB of DDR4 ECC Registered memory across four 16GB modules. It is built for servers, workstations and NAS systems that require registered DIMMs. Standard desktop computers cannot use this memory and it must not be mixed with unbuffered modules.

Sustained Operation

ECC and registered buffering correct single-bit errors and reduce electrical load on the memory controller during continuous workloads. The CL15 latency at 2133MHz delivers steady throughput for virtualisation, database and file-serving tasks that run for hours without reboot.

Build and Connectors

Each module uses a 288-pin DDR4 RDIMM form factor without a heat spreader, fitting standard server DIMM slots. The 2Rx4 dual-rank organisation increases density per channel. JEDEC and RoHS compliance ensures the kit meets OEM specifications for warranty-safe upgrades.

How it compares

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

Price $438.99
Pricier than about 68% of the 6,523 comparable items (median $188.99).
Total capacity 64 GB (4 × 16 GB)
Higher than about 70% of the 6,064 comparable items (median 32 GB).
Price per GB $6.86 per GB
Cheaper than about 54% of the 6,064 comparable items (median $7.25 per GB).

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Specifications

Product
Brand nameOWC
Part number2R1D42R4064S
Total capacity64 GB (4 × 16 GB)
Product type288-Pin DDR4 ECC RDIMM
Performance
Rated speedDDR4 2133 (PC4 17000)
Memory
CAS latencyCL15
ECC supportYes
Buffer typeRegistered
Memory rank2Rx4
Kit configurationDual Channel Kit
Heat spreaderNo
Power
Rated voltage1.2 V

Other versions of this model

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Questions about this item

How much power does the 1.2V DDR4 2133MHz kit draw when the server runs continuously?

Each 16GB module operates at 1.2V, so the four-module kit runs at standard DDR4 voltage without elevated power draw during sustained workloads.

What motherboard feature must my system already have to use these 288-pin ECC Registered RDIMMs?

The board must support DDR4 ECC Registered memory in a 288-pin DIMM slot; standard desktop boards that only accept unbuffered non-ECC modules will not work.

Can I add this 2Rx4 CL15 kit beside older DDR4 2133MHz modules that are single-rank?

Mixing 2Rx4 registered modules with single-rank unbuffered DIMMs is not supported; the platform requires all installed modules to be ECC Registered of matching rank configuration.

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