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Eight green 288-pin DDR4 RDIMM modules with black chips, no heat spreaders

OWC

OWC 128GB (8x16GB) DDR4 2933MHz CL21 2Rx4 ECC Registered RDIMM server RAM

SKU CH-VKFW-3EXMN

Eight 16 GB DDR4-2933 ECC registered RDIMMs at CL21 1.2 V for servers, workstations and NAS systems

  • Total capacity128 GB (8 × 16 GB)
  • Rated speedDDR4 2933 (PC4 23400)
  • CAS latencyCL21
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank2Rx4

Capacity 128GB (8 x 16GB)

Show 4 more

Rank 2Rx4

  • ECC registered design protects data integrity in servers
  • 128GB total capacity from eight 16GB modules
  • DDR4 2933MHz speed with CL21 latency
  • 2V operation reduces power consumption
  • Backward compatible with 2133MHz, 2400MHz, 2666MHz systems

Server memory kit

This OWC kit provides 128 GB of DDR4 ECC registered memory arranged as eight 16 GB modules. It runs at 2933 MHz with a CAS latency of CL21 and operates at the standard 1.2 V. The 288-pin RDIMM form factor and 2Rx4 organisation are built for multi-socket server and workstation platforms that require registered DIMMs with error correction.

For servers and workstations only

The modules are designed for systems that explicitly support DDR4 ECC registered memory, including compatible NAS appliances. They will not function in standard desktop PCs or laptops that accept only unbuffered non-ECC DIMMs, and they cannot be mixed with unbuffered memory in the same platform. Buyers who need memory for a consumer motherboard should look at unbuffered DDR4 kits instead.

Registered ECC requirement

The single specification that decides compatibility is the registered ECC RDIMM design. Your system’s memory controller and BIOS must support registered DDR4 modules with on-die ECC; if the platform only accepts unbuffered DIMMs, this kit will not post. Verify the motherboard or server manual for registered DDR4 2933 MHz support before purchasing.

How it compares

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

Price $847.99
Pricier than about 78% of the 6,523 comparable items (median $188.99).
Total capacity 128 GB (8 × 16 GB)
Higher than about 90% of the 6,064 comparable items (median 32 GB).
Price per GB $6.62 per GB
Cheaper than about 57% of the 6,064 comparable items (median $7.25 per GB).

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Specifications

Product
Brand nameOWC
Part number2R9D42R4128K
Total capacity128 GB (8 × 16 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

5 more in the same range

Questions about this item

Should I pick the 128GB kit with eight 16GB modules or a smaller capacity?

The kit supplies 128GB total across eight 16GB DDR4 2933MHz CL21 registered ECC RDIMMs, designed for servers and workstations that support registered memory.

What does the 2933MHz rating deliver in an actual server?

The modules run at DDR4 2933 (PC4-23400) with CL21 latency at 1.2V, and will down-clock to 2666, 2400 or 2133MHz if the platform requires it.

How does the 288-pin registered ECC interface limit use?

The 288-pin RDIMM form factor with ECC and registered buffering works only in compatible server, workstation or NAS boards; it cannot be used in standard desktop systems or mixed with unbuffered DIMMs.

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