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Four green DDR4 RDIMM modules in anti-static tray

OWC

OWC 256GB (4x64GB) DDR4 2933 CL21 2Rx4 288-pin 1.2V ECC RDIMM Kit HP Z8 G4

SKU CH-5D32-8CKFN

256 GB ECC registered DDR4 kit with four 64 GB modules at 2933 MHz CL21 for HP Z8 G4 workstations

  • Capacity256GB (4 x 64GB)
  • Type288-Pin DDR4 ECC RDIMM
  • SpeedDDR4 2933 (PC4 23400)
  • CAS LatencyCL21
  • Voltage1.2V
  • ECCYes

Capacity 256GB (4 x 64GB)

  • ECC registered design protects data integrity in critical workloads
  • 256 GB kit (4 × 64 GB) expands Z8 G4 memory capacity
  • DDR4 2933 CL21 at 1.2 V delivers rated speed efficiently
  • 288-pin 2Rx4 RDIMM form factor fits HP Z8 G4 slots directly
  • Backward compatible with 2133, 2400 and 2666 MHz systems

HP Z8 G4 ECC RDIMM Kit

This 256GB kit supplies four 64GB DDR4 2933 CL21 registered ECC modules built for the HP Workstation Z8 G4. It targets professionals who need maximum memory capacity for virtualization, rendering or large dataset workloads on that specific platform.

Thermals and Power Profile

Operating at 1.2V, the modules run at standard DDR4 voltage without a heat spreader. Registered buffering reduces electrical load on the memory controller, helping keep power draw predictable during sustained compute tasks.

Build and Connector Details

Each stick uses a 288-pin RDIMM form factor with 2Rx4 organization, keyed for registered ECC slots only. The kit replaces multiple HP part numbers including P19045-K21 and P00930-B21, and cannot be mixed with unbuffered or load-reduced DIMMs.

Highlights

  • ECC registered design protects data integrity in critical workloads
  • 256 GB kit (4 × 64 GB) expands Z8 G4 memory capacity
  • DDR4 2933 CL21 at 1.2 V delivers rated speed efficiently
  • 288-pin 2Rx4 RDIMM form factor fits HP Z8 G4 slots directly
  • Backward compatible with 2133, 2400 and 2666 MHz systems

Specifications

BrandOWC
Part Number2R9D42R4256S
Capacity256GB (4 x 64GB)
Type288-Pin DDR4 ECC RDIMM
SpeedDDR4 2933 (PC4 23400)
CAS LatencyCL21
Voltage1.2V
ECCYes
Buffered/RegisteredRegistered
Rank2Rx4
Heat SpreaderNo
Compatible SystemHP Workstation Z8 G4

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Questions about this item

How do I install the four 64 GB DDR4 2933 ECC RDIMM modules in an HP Z8 G4, and what step do people often miss?

Power off the workstation, open the chassis, and seat each 288-pin module firmly until the retention clips click; the step most often missed is populating all eight channels in the order shown in the HP service guide so the memory controller trains at 2933 MT/s.

What maintenance or replacement will this 256 GB kit need over time?

The modules have no heat spreaders and no moving parts, so no routine maintenance is required; replacement is only necessary if a DIMM fails or if a future workload demands more than 256 GB total capacity.

What limit appears first when this memory runs sustained workloads on the Z8 G4?

The registered ECC design and 1.2 V operation keep thermals low, so the first practical limit is the 256 GB capacity ceiling of this four-module kit rather than bandwidth or temperature throttling.

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