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

OWC

OWC 128GB (2x64GB) DDR4 2400 PC4-19200 CL17 4Rx4 288-pin 1.2V ECC Load Reduced LRDIMM memory upgrade

SKU CH-84W6-PQDY8

Two 64 GB DDR4 2400 ECC load-reduced DIMMs for Cisco UCS B420 M4 and C460 M4 servers

  • Total capacity128 GB (2 × 64 GB)
  • Rated speedDDR4 2400 (PC4 19200)
  • CAS latencyCL17
  • Rated voltage1.2 V
  • Buffer typeLoad Reduced
  • Memory rank4Rx4

Capacity 128GB (2 x 64GB)

  • 128 GB total capacity with two 64 GB modules
  • ECC load-reduced design protects data integrity in servers
  • DDR4 2400 CL17 at 1.2 V for efficient performance
  • 288-pin LRDIMM form factor fits Cisco UCS B420 M4 and C460 M4
  • Backward compatible with 2133 MHz systems for flexible deployment

Server-specific memory kit

This OWC kit supplies 128GB of DDR4 ECC Load Reduced memory as two 64GB modules rated at 2400MHz CL17. It is built for Cisco UCS B420 M4 and C460 M4 systems that require 288-pin LRDIMMs at 1.2V.

Load-reduced ECC advantage

The Load Reduced design lowers electrical load on the memory bus so dense 4Rx4 modules can operate without signal degradation. ECC corrects single-bit errors to protect data integrity in server and workstation workloads.

Installation and compatibility notes

Modules install in standard 288-pin DDR4 slots but must not be mixed with unbuffered or registered ECC DIMMs. The kit is not compatible with desktop or consumer motherboards.

How it compares

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

Price $816.99
Pricier than about 58% 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 $6.38 per GB
Cheaper than about 62% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameOWC
Part number2L4D44R4128P
Total capacity128 GB (2 × 64 GB)
Product type288-Pin DDR4 ECC LRDIMM
Performance
Rated speedDDR4 2400 (PC4 19200)
Memory
CAS latencyCL17
ECC supportYes
Buffer typeLoad Reduced
Memory rank4Rx4
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Compatible systemsCisco UCS B420 M4
Cisco UCS C460 M4 (DDR4)

Other versions of this model

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Questions about this item

Will the 4Rx4 ECC LRDIMM modules need any firmware updates or reconfiguration after installation?

The modules are JEDEC-compliant DDR4 LRDIMMs at 1.2V and 2400MHz CL17. They install directly into Cisco UCS B420 M4 or C460 M4 (DDR4) slots without additional firmware steps.

What limits sustained throughput first — the CL17 latency or the 2400MHz bus speed?

The DDR4 2400 PC4-19200 bus sets the peak bandwidth ceiling; CL17 latency determines response time within that bandwidth envelope.

How much heat do the 2x64GB load-reduced DIMMs generate when the server runs 24/7?

Each 64GB LRDIMM operates at 1.2V without a heat spreader, relying on the server's forced airflow for cooling during continuous operation.

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