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Eight green DDR4 RDIMM modules with gold contacts and black chips

OWC

OWC 64GB (8x8GB) DDR4 2133MHz CL15 ECC Registered RDIMM 1.2V 288-pin Server RAM

SKU CH-389S-G5N1G

Eight 8 GB DDR4 ECC registered RDIMMs totalling 64 GB at 2133 MHz CL15 for servers and workstations

  • Total capacity64 GB (8 × 8 GB)
  • Rated speedDDR4 2133 (PC4 17000)
  • CAS latencyCL15
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank1Rx4

Capacity 64GB (8 x 8GB)

Rank 1Rx4

  • ECC protection prevents data corruption in critical workloads
  • 64GB total capacity across eight 8GB modules
  • DDR4 2133MHz speed with CL15 latency for responsive server performance
  • 2V operation reduces power draw and heat output
  • 288-pin registered RDIMM form factor fits compatible server and workstation slots

Server ECC RDIMM kit

This OWC kit supplies 64GB of DDR4 2133MHz memory in eight 8GB registered DIMMs. Each module runs at CL15 latency and 1.2V, conforming to the PC4-17000 standard. The registered design with ECC targets servers, workstations and NAS systems that require error correction and signal buffering. Standard desktop boards cannot use these modules.

Upgrade from non-ECC or unbuffered DDR4

The jump is worthwhile when the platform demands registered ECC memory for data integrity or when the motherboard rejects unbuffered DIMMs. Mixing this kit with unbuffered modules will prevent boot, so a full replacement is required. The 1Rx4 organisation suits systems qualified for single-rank registered DIMMs at this speed.

Sustained load behaviour

Registered buffering reduces electrical load on the memory controller during continuous operation, helping stability in multi-DIMM configurations. ECC corrects single-bit errors on the fly, preventing silent data corruption during long compute or storage tasks. The 1.2V rating keeps power draw consistent across extended duty cycles.

How it compares

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

Price $554.99
Pricier than about 72% of the 6,523 comparable items (median $188.99).
Total capacity 64 GB (8 × 8 GB)
Higher than about 70% of the 6,064 comparable items (median 32 GB).
Price per GB $8.67 per GB
Pricier than about 61% of the 6,064 comparable items (median $7.25 per GB).

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Specifications

Product
Brand nameOWC
Part number2R1D41R4064K
Total capacity64 GB (8 × 8 GB)
Product type288-Pin DDR4 ECC RDIMM
Performance
Rated speedDDR4 2133 (PC4 17000)
Memory
CAS latencyCL15
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

Will the 288-pin DDR4 RDIMMs fit my server's DIMM slots?

These modules use the standard 288-pin DDR4 RDIMM form factor, so they fit any server or workstation slot designed for registered DDR4 memory.

Do I need to populate all eight slots at once, or can I install them in stages?

The kit contains eight matched 8 GB modules; for proper multi-channel operation install them in identical pairs following your motherboard's channel guide.

Is there any maintenance such as firmware updates or battery replacement required for these RDIMMs?

No firmware or battery maintenance is needed; the modules are passive components, and ECC error correction runs automatically once the system is configured.

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