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Two green 288-pin DDR4 LRDIMM modules with black chips, no heat spreader

OWC

OWC 256GB (2x128GB) DDR4 2933 CL21 4Rx4 ECC LRDIMM HP Z8 G4

SKU CH-CCH3-SETAG

A 256 GB kit of two 128 GB DDR4 2933 CL21 ECC load-reduced DIMMs for HP Z8 G4 workstations

  • Total capacity256 GB (2 × 128 GB)
  • Rated speedDDR4 2933 (PC4 23400)
  • CAS latencyCL21
  • Rated voltage1.2 V
  • Buffer typeLoad Reduced
  • Memory rank4Rx4

Capacity 256GB (2 x 128GB)

  • 256 GB kit expands workstation capacity for large datasets
  • Two 128 GB modules populate dual channels for balanced throughput
  • DDR4 2933 CL21 timing delivers responsive performance at 1.2 V
  • ECC load-reduced design detects errors and reduces electrical load on the memory bus
  • Compatible with HP Z8 G4 and backward compatible with 2133, 2400 and 2666 MHz systems

HP Z8 G4 256GB kit

This 256GB kit contains two 128GB DDR4 ECC Load Reduced DIMMs validated for the HP Workstation Z8 G4. It targets IT teams expanding memory in that specific platform for virtualization or large dataset workloads. Builders using standard desktop boards or consumer laptops cannot use these modules.

DDR4 2933 CL21 limits

The modules run at 2933 MT/s with CL21 timing at 1.2V and will down-clock to 2666, 2400 or 2133 MT/s when the system requires it. Mixing with unbuffered or registered ECC DIMMs is not supported and will prevent the system from booting. Buyers who need higher frequencies or lower latencies must choose a different memory technology.

288-pin LRDIMM build

Each stick uses a 4Rx4 Load Reduced layout without a heat spreader, relying on the workstation's directed airflow for cooling. The 288-pin edge connector fits only DDR4 LRDIMM slots keyed for server and workstation platforms. Buyers who need registered ECC or non-ECC UDIMM form factors should look elsewhere.

How it compares

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

Price $1,411.99
Pricier than about 64% of the 21,161 comparable items (median $397.99).
Total capacity 256 GB (2 × 128 GB)
Higher than about 80% of the 20,941 comparable items (median 32 GB).
Price per GB $5.52 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 number2L9D44R4256P
Total capacity256 GB (2 × 128 GB)
Product type288-Pin DDR4 ECC LRDIMM
Performance
Rated speedDDR4 2933 (PC4 23400)
Memory
CAS latencyCL21
ECC supportYes
Buffer typeLoad Reduced
Memory rank4Rx4
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Compatible systemsHP Workstation Z8 G4

Other versions of this model

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Questions about this item

Should I buy the 256 GB kit as two 128 GB modules or look for a different capacity for my Z8 G4?

The kit provides 256 GB total using two 128 GB LRDIMMs; add or remove identical modules in matched pairs to reach the capacity your workloads need.

What does the DDR4 2933 CL21 rating deliver inside an HP Z8 G4 workstation?

The modules run at 2933 MHz with CAS latency 21 at 1.2 V; the Z8 G4 memory controller will clock them at the highest speed the installed CPU supports.

How does the PC4-23400 LRDIMM interface affect maximum usable speed?

PC4-23400 is the peak transfer rate for DDR4 2933; the LRDIMM buffer reduces electrical load so the Z8 G4 can populate more slots, but the bus still caps at 2933 MHz.

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