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Green rectangular DDR4 RDIMM module with black chips and gold edge contacts

OWC

OWC 128GB DDR4 3200MHz CL22 1.2V 288pin ECC Registered RDIMM 4Rx4 3R2D44R4128G

SKU CH-BN3S-M7KQ4

128 GB DDR4 3200 MHz ECC registered RDIMM for Lenovo ThinkSystem SR635, SR655, SR850 and SR860 servers

  • Total capacity128 GB
  • Rated speedDDR4 3200 (PC4 25600)
  • CAS latencyCL22
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank4Rx4

Capacity 128GB

  • 128 GB capacity supports demanding server workloads
  • DDR4 3200 MHz speed delivers high data throughput
  • CL22 latency at 1.2 V balances performance and efficiency
  • ECC Registered 4Rx4 design ensures data integrity under load
  • Validated for Lenovo ThinkSystem SR635, SR655, SR850 and SR860

Server ECC RDIMM for Lenovo ThinkSystem

This 128GB DDR4 module is built for Lenovo ThinkSystem SR635, SR655, SR850 (Xeon SP Gen 2) and SR860 (Xeon SP Gen 2) servers. It delivers registered ECC memory for workloads that require data integrity and high capacity in a single DIMM. The part is not compatible with standard desktop computers or unbuffered memory configurations.

Registered ECC with 4Rx4 organisation

The single specification that decides fit is the registered ECC design with a 4Rx4 rank structure. This module will only operate in platforms that support registered DDR4 ECC RDIMMs and cannot be mixed with unbuffered DIMMs. Verify that your ThinkSystem model and BIOS revision accept 128GB 4Rx4 modules before purchase.

Standard voltage DDR4 thermals

Operating at 1.2V without a heat spreader, the module relies on server chassis airflow for cooling. In normal use it runs within JEDEC thermal limits and produces no audible noise. Power draw scales with the 3200MHz data rate and 4Rx4 density, matching the platform's standard DDR4 power budget.

How it compares

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

Price $677.99
Pricier than about 55% 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 $5.30 per GB
Cheaper than about 73% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameOWC
Part number3R2D44R4128G
Total capacity128 GB
Product type288-Pin DDR4 ECC RDIMM
Performance
Rated speedDDR4 3200 (PC4 25600)
Memory
CAS latencyCL22
ECC supportYes
Buffer typeRegistered
Memory rank4Rx4
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Compatible systemsLenovo ThinkSystem SR635
Lenovo ThinkSystem SR655
Lenovo ThinkSystem SR850 (Xeon SP Gen 2)
Lenovo ThinkSystem SR860 (Xeon SP Gen 2)

Other versions of this model

5 more in the same range

Questions about this item

What does the 128 GB capacity mean once installed in a Lenovo ThinkSystem SR850?

The module provides 128 GB of registered ECC DDR4 memory, adding that full amount to the server's total memory pool for workloads such as virtualization or large databases.

How does the DDR4 3200 PC4-25600 interface limit real-world throughput?

The PC4-25600 rating caps the module at 25 600 MB/s peak transfer rate; actual throughput will be lower due to CL22 latency and system memory controller overhead.

What physical slot and clearance does the 288-pin RDIMM need in a ThinkSystem SR635?

It fits a standard 288-pin DDR4 DIMM slot; the module has no heat spreader, so it clears normal server CPU heatsinks and adjacent DIMMs.

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