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Two green DDR5 RDIMM modules with gold contacts and black chips

OWC

OWC 128GB (2x64GB) DDR5 4800 CL40 ECC Registered RDIMM ThinkStation P5

SKU CH-HG9J-R7NEY

128 GB DDR5 ECC registered RDIMM kit for Lenovo ThinkStation P5 workstations

  • Total capacity128 GB (2 × 64 GB)
  • Rated speedDDR5 4800 (PC5 38400)
  • CAS latencyCL40
  • Rated voltage1.1 V
  • Buffer typeRegistered
  • Memory rank2Rx4

Capacity 128GB (2 x 64GB)

  • 128 GB capacity expands workstation memory for large datasets
  • ECC registered design detects and corrects data errors automatically
  • DDR5 4800 speed delivers high bandwidth for demanding applications
  • 2Rx4 organisation increases density within each 64 GB module
  • JEDEC and RoHS compliant for warranty-safe upgrades

Capacity & Compatibility

This 128GB kit contains two 64GB DDR5 4800 CL40 ECC registered RDIMMs built specifically for the Lenovo ThinkStation P5 workstation. The modules run at 1.1V and use a 2Rx4 organisation with 288 pins. They are designed for systems that require registered ECC memory and will not operate in standard desktop platforms.

Who This Suits

The kit suits administrators upgrading a ThinkStation P5 for virtualisation, scientific computing or large-dataset workloads that benefit from error-correcting registered memory. Buyers who need unbuffered ECC or load-reduced DIMMs should look elsewhere because this memory cannot be mixed with those types. It is also unsuitable for any system that does not support registered DDR5 modules.

Installation Notes

Installation follows the standard DIMM-slot procedure for the ThinkStation P5; no heat spreader is present, so handling the modules by the edges is recommended. The most common issue is attempting to mix these registered DIMMs with unbuffered or load-reduced memory, which prevents the system from posting. Ensure all populated slots use identical registered ECC modules.

How it compares

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

Price $2,887.99
Pricier than about 72% 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 $22.56 per GB
Pricier than about 67% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameOWC
Part number4R8D52R4128P
Total capacity128 GB (2 × 64 GB)
Product type288-Pin DDR5 ECC RDIMM
Performance
Rated speedDDR5 4800 (PC5 38400)
Memory
CAS latencyCL40
ECC supportYes
Buffer typeRegistered
Memory rank2Rx4
Heat spreaderNo
Power
Rated voltage1.1 V
Compatibility
Compatible systemsLenovo ThinkStation P5

Other versions of this model

5 more in the same range

Questions about this item

Does my ThinkStation P5 need a specific motherboard revision to run this 288-pin DDR5 4800 ECC Registered RDIMM kit?

The kit is validated for the ThinkStation P5 platform; consult the system documentation or Lenovo support to confirm the exact motherboard revision required.

Can I keep my existing DDR5 4800 ECC Registered modules and add this 2Rx4 1.1V kit alongside them?

Mixing is only supported with identical ECC Registered modules; do not combine with unbuffered or load-reduced memory.

How can I verify the 128GB kit is running at the rated 4800 MT/s CL40 after installation?

Check the memory speed and timings in the BIOS or UEFI firmware; they should report DDR5 4800 with CAS latency 40.

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