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Green rectangular DDR5 memory module with gold contacts and black chips, no heat spreader

OWC

OWC 128GB DDR5 4800 CL40 4Rx4 288-pin ECC RDIMM 1.1V Memory Upgrade

SKU CH-AHKK-TSW9K

A single 128 GB DDR5 4800 CL40 4Rx4 288-pin ECC registered RDIMM at 1.1 V for Lenovo ThinkSystem SD650 V3, SD650-I V3, SD665 V3, SD665-N V3 and SR630 V3 servers

  • Total capacity128 GB
  • Rated speedDDR5 4800 (PC5 38400)
  • CAS latencyCL40
  • Rated voltage1.1 V
  • Buffer typeRegistered
  • Memory rank4Rx4

Capacity 128GB

  • 128 GB single module boosts server capacity
  • DDR5 4800 CL40 delivers high-throughput performance
  • ECC registered design protects data integrity
  • 1 V operation reduces power draw
  • Validated for ThinkSystem SD650 V3 SD650-I V3 SD665 V3 SD665-N V3 SR630 V3

Server ECC RDIMM Upgrade

This 128GB DDR5 4800 CL40 4Rx4 288-pin ECC Registered RDIMM operates at 1.1V. It is designed as a direct memory upgrade for specific Lenovo ThinkSystem servers. The module provides registered error-correcting code functionality for data integrity.

Suited for ThinkSystem V3 Servers

Compatible with ThinkSystem SD650 V3, SD650-I V3, SD665 V3, SD665-N V3 and SR630 V3 systems. Not suitable for standard desktop computers or workstations requiring unbuffered memory. Cannot be mixed with load-reduced or unbuffered DIMM types in the same system.

Single 128GB Module Capacity

The upgrade consists of a single 128GB module using 4Rx4 organisation. Verify the server memory population rules and maximum supported capacity per slot before installation. This density determines whether the part matches the required configuration.

How it compares

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

Price $3,870.99
Pricier than about 76% of the 21,161 comparable items (median $397.99).
Total capacity 128 GB
Higher than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $30.24 per GB
Pricier than about 86% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameOWC
Part number4R8D54R4128G
Total capacity128 GB
Product type288-Pin DDR5 ECC RDIMM
Performance
Rated speedDDR5 4800 (PC5 38400)
Memory
CAS latencyCL40
ECC supportYes
Buffer typeRegistered
Memory rank4Rx4
Heat spreaderNo
Power
Rated voltage1.1 V
Compatibility
Compatible systemsLenovo ThinkSystem SD650 V3
Lenovo ThinkSystem SD650-I V3
Lenovo ThinkSystem SD665 V3
Lenovo ThinkSystem SD665-N V3
Lenovo ThinkSystem SR630 V3

Other versions of this model

5 more in the same range

Questions about this item

What is the CAS latency that defines timing limits for this DDR5 4800 ECC RDIMM?

The module runs at CL40, which sets the minimum cycle delay for every read operation under sustained server workloads.

How much heat does a 1.1 V registered DIMM generate during all-day operation?

At 1.1 V the 128 GB DDR5 4800 RDIMM draws minimal power and has no heat spreader, so airflow in the ThinkSystem chassis handles cooling silently.

Which Lenovo ThinkSystem servers must I already own to install this 288-pin 4Rx4 module?

This OWC upgrade is validated for ThinkSystem SD650 V3, SD650-I V3, SD665 V3, SD665-N V3 and SR630 V3 platforms.

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