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Green printed circuit board with black memory chips, gold edge connector, no heat spreader

OWC

OWC 64GB DDR5 4800 CL40 2Rx4 288-pin 1.1V ECC Registered RDIMM ThinkStation P5 memory upgrade

SKU CH-DXSG-393A7

64GB DDR5-4800 ECC registered RDIMM for Lenovo ThinkStation P5 workstations

  • Total capacity64 GB
  • Rated speedDDR5 4800 (PC5 38400)
  • CAS latencyCL40
  • Rated voltage1.1 V
  • Buffer typeRegistered
  • Memory rank2Rx4

Capacity 64GB

  • 64 GB capacity lets you run larger workloads and more virtual machines simultaneously
  • DDR5 4800 speed with CL40 latency delivers high throughput for demanding applications
  • ECC registered design detects and corrects data errors to protect critical workloads
  • 1 V operation reduces power draw and heat in dense configurations
  • Single 64 GB 2Rx4 module simplifies upgrades for compatible ThinkStation P5 systems

Target workstation memory

This is a 64GB DDR5 4800 CL40 ECC registered RDIMM built for the Lenovo ThinkStation P5. It operates at 1.1V with a 2Rx4 organisation and fits the 288-pin slot used by that platform. The module is not compatible with standard desktop motherboards or with unbuffered or load-reduced memory types.

Single-module upgrade

The package contains one 64GB DIMM that replaces Lenovo part numbers 4X71M22550, 4X77A77032, 4X77A77033, 4X77A81441 and 4X77A81442. No heat spreader is fitted, so the module relies on the workstation's internal airflow. Buyers who want more capacity must add further identical modules.

Direct slot installation

Installation consists of seating the DIMM into a free 288-pin DDR5 slot until the retention clips engage. The registered design requires the platform to support ECC registered memory; mixing with unbuffered or load-reduced DIMMs will prevent the system from posting. No additional software or firmware steps are needed.

How it compares

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

Price $1,462.99
Pricier than about 64% of the 21,161 comparable items (median $397.99).
Total capacity 64 GB
Higher than about 60% of the 20,941 comparable items (median 32 GB).
Price per GB $22.86 per GB
Pricier than about 68% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameOWC
Part number4R8D52R464 GB
Total capacity64 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

Will the 2Rx4 registered DIMM need any firmware updates or matching modules when I add it later?

The module is a single 64GB 2Rx4 registered DIMM; install it in a supported ThinkStation P5 slot following the system's population rules and no firmware step is required for the memory itself.

What thermal limit appears first when the 1.1V DDR5 4800 module runs at full load continuously?

The JEDEC-rated 1.1V DDR5 4800 part has no heat spreader, so the DRAM junction temperature reaches its spec limit before the PCB or surrounding airflow becomes the bottleneck.

How much extra power and fan noise does the 288-pin ECC registered stick add during all-day workloads?

At 1.1V the 64GB registered DIMM draws only a few watts, adding negligible heat and no audible fan noise inside a ThinkStation P5 chassis.

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