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Four green DDR4 RDIMM sticks with gold contacts and black chips

OWC

OWC 256GB (4x64GB) DDR4 2933MHz CL21 ECC Registered RDIMM 1.2V 288-pin server RAM

SKU CH-F2RM-E4TVD

256 GB kit of four 64 GB DDR4-2933 ECC registered RDIMMs at CL21 and 1.2 V for servers, workstations and NAS systems

  • Total capacity256 GB (4 × 64 GB)
  • Rated speedDDR4 2933 (PC4 23400)
  • CAS latencyCL21
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank2Rx4

Capacity 256GB (4 x 64GB)

Show 4 more

Rank 2Rx4

  • ECC registered design prevents data corruption in servers
  • 256GB total capacity across four 64GB modules
  • DDR4 2933MHz speed with CL21 latency
  • 2V low voltage reduces power consumption
  • Backward compatible with 2133, 2400 and 2666MHz systems

Server ECC Registered Memory Kit

This OWC kit provides 256GB of DDR4 ECC registered memory across four 64GB modules. It is designed for servers, workstations and NAS systems that require registered DIMMs. Standard desktop platforms cannot use this memory and it must not be mixed with unbuffered modules.

256GB Capacity with 2933MHz Speed

The four-module kit delivers 256GB total capacity using 2Rx4 organisation at DDR4 2933MHz CL21. Backward compatibility allows operation at 2133MHz, 2400MHz and 2666MHz when the platform requires lower speeds. Memory headroom is limited to the JEDEC-standard speeds listed.

Low-Voltage Operation Without Heat Spreaders

Modules run at 1.2V and have no integrated heat spreaders, relying on chassis airflow for cooling. Registered buffering and ECC add minimal latency overhead while maintaining signal integrity in multi-DIMM configurations. Power draw scales with the number of populated slots and operating frequency.

How it compares

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

Price $1,476.99
Pricier than about 83% of the 6,523 comparable items (median $188.99).
Total capacity 256 GB (4 × 64 GB)
Higher than about 90% of the 6,064 comparable items (median 32 GB).
Price per GB $5.77 per GB
Cheaper than about 66% of the 6,064 comparable items (median $7.25 per GB).

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Specifications

Product
Brand nameOWC
Part number2R9D42R4256S
Total capacity256 GB (4 × 64 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

Will these 2933MHz RDIMMs run at full speed alongside my existing 2666MHz server DIMMs?

The kit is backward compatible with 2133MHz, 2400MHz and 2666MHz modules. When mixed, the system will operate all memory at the speed of the slowest installed DIMMs.

How can I confirm the ECC registered 2Rx4 modules are detected correctly after installation?

Check the server BIOS or IPMI interface during POST; it should report 256GB total capacity, 2933MHz speed, CL21 latency, 1.2V voltage and ECC registered status for each 64GB module.

Does the 4x64GB package include heat spreaders or any extra cables I need to buy?

The modules have no heat spreaders and ship as four bare 288-pin RDIMMs. No cables, brackets or additional components are included or required for standard server DIMM slots.

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