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Two green DDR4 server memory modules with gold contacts and black chips, no heat spreaders

OWC

OWC 64GB (2x32GB) DDR4 2933MHz CL21 ECC Registered RDIMM 1.2V 288-pin Server RAM

SKU CH-SHF2-ZHEP1

A 64 GB dual-channel DDR4 ECC registered RDIMM kit running at 2933 MHz CL21 and 1.2 V for servers and workstations

  • Total capacity64 GB (2 × 32 GB)
  • Rated speedDDR4 2933 (PC4 23400)
  • CAS latencyCL21
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank2Rx4

Capacity 64GB (2 x 32GB)

Show 4 more

Rank 2Rx4

  • ECC registered design protects data integrity in servers
  • 64GB dual-channel kit expands memory capacity efficiently
  • 2933MHz DDR4 speed with CL21 latency delivers responsive performance
  • 2V operation reduces power consumption in dense configurations
  • Backward compatible with 2133, 2400 and 2666MHz systems

Server-grade ECC registered memory kit

This 64GB dual-channel kit contains two 32GB DDR4 ECC registered RDIMMs designed for servers, workstations and NAS systems. Registered buffering and on-die ECC protect data integrity in multi-socket and mission-critical environments. It is not compatible with standard desktop platforms or unbuffered memory configurations.

Registered buffering and ECC for data integrity

The registered RDIMM design places a register between the DRAM and the memory controller, reducing electrical load and enabling larger memory populations per channel. Combined with ECC, this single feature determines whether the module will function in a qualified server or workstation platform.

64GB total capacity at 2933MHz

The kit delivers 64GB of addressable memory running at PC4-23400 2933MHz CL21 and will down-clock to 2133MHz, 2400MHz or 2666MHz to match slower bus speeds. Voltage is 1.2V. Systems requiring more than 64GB per channel or unregistered DIMMs cannot use this kit.

How it compares

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

Price $441.99
Pricier than about 68% of the 6,523 comparable items (median $188.99).
Total capacity 64 GB (2 × 32 GB)
Higher than about 70% of the 6,064 comparable items (median 32 GB).
Price per GB $6.91 per GB
Typical for this category: the median of 6,064 items is $7.25 per GB.

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Specifications

Product
Brand nameOWC
Part number2R9D42R4064P
Total capacity64 GB (2 × 32 GB)
Product type288-Pin DDR4 ECC RDIMM
Performance
Rated speedDDR4 2933 (PC4 23400)
Memory
CAS latencyCL21
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

What does the 2933 MHz rating actually deliver once the modules are installed in a server?

The kit runs at DDR4 2933 (PC4-23400) with CL21 latency at 1.2 V, providing 64 GB of registered ECC capacity across two 32 GB modules for workloads that require error correction and signal buffering.

How does the DDR4 288-pin registered ECC interface limit what the memory can do in practice?

The registered ECC design adds a clock cycle of buffering and single-bit error correction, so the modules only work in server, workstation or NAS platforms that support registered DIMMs and cannot be mixed with unbuffered memory.

What physical space and slot layout do the two 32 GB sticks need to fit and run in dual channel?

Each module is a standard 288-pin DDR4 RDIMM without a heat spreader, so they occupy two adjacent DIMM slots and require a platform that supports 2Rx4 registered DIMMs at 1.2 V.

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