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Green rectangular DDR4 ECC registered DIMM with black chips on both sides

OWC

OWC 128GB DDR4 2666 PC4-21300 CL19 8Rx4 288-pin 1.2V ECC RDIMM ThinkAgile Xeon SP Gen 1

SKU CH-3EV4-WC5GF

128 GB DDR4 2666 ECC registered DIMM for Lenovo ThinkAgile Xeon SP Gen 1 servers

  • Total capacity128 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • CAS latency19
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank8Rx4
  • 128 GB single-module capacity simplifies density scaling
  • ECC registered design protects data integrity in servers
  • DDR4 2666 CL19 speed matches platform specifications
  • 2 V operation reduces power draw per module
  • Validated for ThinkAgile HX 3520, HX 3521, VX 2U, VX 2U4N, VX 5520

Server-specific memory upgrade

This is a single 128GB DDR4 2666 PC4-21300 CL19 8Rx4 288-pin 1.2V ECC Registered RDIMM module from OWC. It is built for Lenovo ThinkAgile systems running Xeon SP Gen 1 processors including the HX3520-G, HX3521-G, VX 2U, VX 2U4N and VX5520. The module meets JEDEC and RoHS standards and is tested for warranty-safe installation. It will not fit standard desktop computers.

Suited for capacity expansion in compatible

This module suits administrators adding high-density memory to the listed ThinkAgile platforms where registered ECC DDR4 is required. It is not for desktop PCs, workstations that accept only unbuffered DIMMs, or systems that require load-reduced memory. Mixing with unbuffered or load-reduced modules is not supported. Buyers needing non-ECC or consumer-form-factor memory should look elsewhere.

Steady throughput under sustained server workloads

The registered buffer and ECC circuitry maintain data integrity during continuous operation across all ranks. Rated at 2666MHz with CL19 latency and 1.2V, the module also runs at 2133MHz and 2400MHz where the platform dictates. This behaviour supports long-running virtualisation, database and compute tasks without the error accumulation seen in non-ECC alternatives.

How it compares

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

Price $754.99
Pricier than about 57% 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).
CAS latency 19
Lower than about 70% of the 483 comparable items (median 22).
Price per GB $5.90 per GB
Cheaper than about 66% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameOWC
Part number2R6D48R4128G
Total capacity128 GB
Product type288-Pin DDR4 ECC RDIMM
Performance
Rated speedDDR4 2666 (PC4 21300)
Memory
CAS latency19
ECC supportYes
Buffer typeRegistered
Memory rank8Rx4
Heat spreaderNo
Power
Rated voltage1.2 V

Questions about this item

Which Lenovo ThinkAgile Xeon SP Gen 1 models accept this 128GB DDR4 2666 RDIMM?

It is validated for the HX3520-G, HX3521-G, VX 2U, VX 2U4N and VX5520. The system must support 288-pin ECC registered DDR4 at 1.2V.

Will this module run with existing 2133MHz or 2400MHz DDR4 ECC RDIMMs in the same server?

Yes, the module is backward compatible with 2133MHz and 2400MHz speeds. All DIMMs must be ECC registered; mixing with unbuffered or load-reduced memory is not supported.

How can I confirm the module is detected at 2666MHz with CL19 after installation?

Check the BIOS memory configuration or the OS memory report. It should show 128GB per module, DDR4-2666, CAS latency 19, ECC registered, 8Rx4 organisation.

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