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Four green 288-pin DDR4 RDIMM modules with black chips

OWC

OWC 512GB (4x128GB) DDR4 2933MHz PC4-23400 CL21 4RX4 ECC Registered RDIMM 1.2V 288-pin Server RAM

SKU CH-TZ1X-P7NTN

Four 128 GB DDR4 2933 MHz ECC registered RDIMMs totalling 512 GB for servers and workstations

  • Total capacity512 GB (4 × 128 GB)
  • Rated speedDDR4 2933 (PC4 23400)
  • CAS latencyCL21
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank4Rx4

Capacity 512GB (4 x 128GB)

Show 4 more

Rank 4Rx4

  • ECC registered design protects data integrity in servers
  • 512GB total capacity across four 128GB modules
  • DDR4 2933MHz speed with CL21 latency
  • 2V operation meets JEDEC standard
  • Backward compatible with 2133MHz, 2400MHz, 2666MHz systems

Server-grade capacity for data-intensive workloads

This kit delivers 512GB of DDR4 memory across four 128GB registered DIMMs. It targets administrators upgrading enterprise servers, workstations or NAS systems that require error-correcting code and registered signal buffering for stability under sustained load.

Requires DDR4 RDIMM slots

The modules operate at 1.2V and conform to the PC4-23400 standard with CL21 timing. They are backward compatible with 2133MHz, 2400MHz and 2666MHz bus speeds. Systems must accept 4Rx4 registered DIMMs; unbuffered consumer platforms cannot use this memory.

Passive cooling suits dense, airflow-managed chassis

No heat spreaders are fitted, reducing module height for tight slot spacing. Power draw stays at the standard DDR4 1.2V level, letting existing server cooling handle thermal load without additional fan speed or noise increase during typical operation.

How it compares

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

Price $2,581.99
Pricier than about 90% of the 6,523 comparable items (median $188.99).
Total capacity 512 GB (4 × 128 GB)
Higher than about 91% of the 6,064 comparable items (median 32 GB).
Price per GB $5.04 per GB
Cheaper than about 73% of the 6,064 comparable items (median $7.25 per GB).

New to this? Buying memory and SSDs with crypto — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameOWC
Part number2R9D44R4512S
Total capacity512 GB (4 × 128 GB)
Product type288-Pin DDR4 ECC RDIMM
Performance
Rated speedDDR4 2933 (PC4 23400)
Memory
CAS latencyCL21
ECC supportYes
Buffer typeRegistered
Memory rank4Rx4
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 4Rx4 registered DIMMs hit a rank-per-channel limit before I fill all 512GB?

Each 128GB module is quad-rank 4Rx4; most server chipsets allow eight ranks per channel, so two modules per channel reach that ceiling before all four slots are used.

How much heat does a full 512GB kit generate at 1.2V with no heat spreaders?

Registered ECC modules at 1.2V typically draw 3–5 watts each under sustained load; four modules stay well within normal server airflow limits without spreaders.

Must my motherboard already support DDR4 2933 registered ECC and 288-pin RDIMM slots?

Yes — the kit requires a server or workstation board with DDR4 registered ECC memory controllers and 288-pin RDIMM sockets; it will not work in standard desktop systems.

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