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Green DDR4 ECC RDIMM circuit board with gold edge connector and black memory chips

OWC

OWC 16GB DDR4 3200MHz CL22 1.2V 288pin ECC Registered RDIMM Lenovo ThinkSystem SR635 SR655 SR850 SR860

SKU CH-G3MH-1FHZB

16 GB DDR4-3200 ECC registered RDIMM validated for Lenovo ThinkSystem SR635, SR655, SR850 and SR860 servers

  • Total capacity16 GB
  • Rated speedDDR4 3200 (PC4 25600)
  • CAS latencyCL22
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank2Rx8

Capacity 16GB

  • 16 GB DDR4 3200 MHz ECC RDIMM for Lenovo ThinkSystem SR635 SR655 SR850 SR860
  • CL22 1.2 V registered module keeps data integrity in server workloads
  • 288-pin 2Rx8 design fits validated Lenovo platforms without mixing
  • Replaces Lenovo part 4ZC7A15121 for drop-in upgrades
  • JEDEC PC4-25600 compliance ensures reliable operation across qualified systems

16GB DDR4 3200MHz ECC RDIMM

This 16GB DDR4 3200MHz CL22 registered DIMM adds error-correcting memory capacity to compatible Lenovo ThinkSystem servers. It operates at 1.2V across a 288-pin interface and carries a 2Rx8 organisation. The module is built for the SR635, SR655, SR850 and SR860 platforms that use second-generation Xeon Scalable processors.

Registered ECC constraints

Registered ECC memory cannot be mixed with unbuffered modules and will not function in standard desktop platforms. The DDR4 3200 JEDEC interface limits bandwidth to the PC4-25600 data rate, so total throughput scales with the number of populated channels on the host system.

Replaces Lenovo 4ZC7A15121

This module directly replaces the Lenovo 4ZC7A15121 part number for field upgrades or warranty-safe expansion. The jump is worth it when the workload demands registered ECC reliability and the chassis has free DDR4 slots that support 3200MHz operation.

How it compares

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

Price $117.99
Cheaper than about 65% of the 21,161 comparable items (median $397.99).
Total capacity 16 GB
Lower than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $7.37 per GB
Cheaper than about 55% of the 20,941 comparable items (median $8.19 per GB).

New to this? Buying memory and SSDs with crypto — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameOWC
Part number3R2D42R816 GB
Total capacity16 GB
Product type288-Pin DDR4 ECC RDIMM
Performance
Rated speedDDR4 3200 (PC4 25600)
Memory
CAS latencyCL22
ECC supportYes
Buffer typeRegistered
Memory rank2Rx8
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

Should I choose the 16GB module or a different capacity for my ThinkSystem SR635?

The 16GB DDR4 3200MHz CL22 1.2V 288pin ECC Registered RDIMM is the capacity offered here; match it with identical modules for optimal performance in SR635, SR655, SR850 (Xeon SP Gen 2) and SR860 (Xeon SP Gen 2) systems.

What does the 3200MHz speed mean once the DIMM is installed in a ThinkSystem SR850?

The module runs at DDR4 3200 (PC4-25600) with CL22 latency, delivering the rated throughput when the server memory controller operates at that frequency.

Does the 288pin DDR4 ECC Registered interface limit the maximum memory speed on a ThinkSystem SR655?

The 288-pin DDR4 RDIMM interface supports the module's native 3200MHz rating; actual speed is governed by the server's memory controller and populated DIMM slots.

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