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Two green 288-pin DDR4 RDIMM modules, 128GB total

OWC

OWC 128GB (2x64GB) DDR4 2933 CL21 2Rx4 288-pin 1.2V ECC RDIMM memory upgrade

SKU CH-6F3P-5EF7W

128 GB DDR4 ECC registered RDIMM kit (2 × 64 GB) running at 2933 MHz CL21 1.2 V for HP Z8 G4 workstations

  • Total capacity128 GB (2 × 64 GB)
  • Rated speedDDR4 2933 (PC4 23400)
  • CAS latencyCL21
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank2Rx4

Capacity 128GB (2 x 64GB)

  • 128 GB total capacity from two 64 GB modules
  • ECC registered design protects data integrity in workstations
  • 2933 MHz DDR4 speed with CL21 latency
  • 2 V operation reduces power draw
  • Backward compatible with 2133, 2400 and 2666 MHz systems

System-specific ECC RDIMM kit

This 128GB kit contains two 64GB DDR4 2933 modules built to JEDEC PC4-23400 CL21 timings. Each stick is a 2Rx4 288-pin registered DIMM running at 1.2V with ECC error correction. It is engineered for the HP Workstation Z8 G4 and replaces a long list of HP part numbers.

For Z8 G4 workstations needing registered ECC

The modules suit servers, workstations and NAS systems that require registered ECC memory and accept DDR4 2933, 2666, 2400 or 2133 speeds. They will not work in standard desktop boards that take only unbuffered non-ECC DIMMs, nor in systems limited to load-reduced ECC. Buyers without a Z8 G4 or compatible registered-ECC platform should look elsewhere.

Registered ECC is the deciding factor

The memory is registered ECC RDIMM, not unbuffered and not load-reduced. If the target machine demands registered ECC DDR4, this kit matches; if it requires unbuffered or LRDIMM, it will not post.

How it compares

Measured against everything we stock in Model-Specific Memory Upgrades, at today’s prices. Recalculated every night.

Price $708.99
Pricier than about 56% of the 21,161 comparable items (median $397.99).
Total capacity 128 GB (2 × 64 GB)
Higher than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $5.54 per GB
Cheaper than about 70% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameOWC
Part number2R9D42R4128P
Total capacity128 GB (2 × 64 GB)
Product type288-Pin DDR4 ECC RDIMM
Performance
Rated speedDDR4 2933 (PC4 23400)
Memory
CAS latencyCL21
ECC supportYes
Buffer typeRegistered
Memory rank2Rx4
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Compatible systemsHP Workstation Z8 G4

Other versions of this model

5 more in the same range

Questions about this item

What is included in the OWC 128GB DDR4 2933 ECC RDIMM kit and does anything else need to be purchased?

The kit contains two 64GB DDR4 2933 CL21 2Rx4 288-pin 1.2V ECC Registered RDIMM modules, giving 128GB total. No extra parts are required for installation in a compatible system.

How do I choose between the available capacities or versions of this OWC memory for my HP Workstation Z8 G4?

This part number (2R9D42R4128P) is a fixed 128GB kit of two 64GB modules. Select it when the workstation needs that exact capacity; other OWC kits list different totals.

What does the 2933MHz rating mean once the modules are installed in the Z8 G4?

The modules run at DDR4 2933 (PC4-23400) CL21 at 1.2V. They are backward compatible with 2133MHz, 2400MHz and 2666MHz bus speeds if the platform requires a lower frequency.

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