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Green rectangular circuit board with gold edge connectors and black memory chips

OWC

OWC 64GB DDR4 2933MHz ECC Registered RDIMM memory upgrade for Lenovo ThinkSystem ST550

SKU CH-1KB1-Q496P

64GB DDR4 2933MHz ECC Registered RDIMM module validated for Lenovo ThinkSystem ST550 servers

  • Total capacity64 GB
  • Rated speedDDR4 2933 (PC4 23400)
  • CAS latencyCL21
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank2Rx4

Capacity 64GB

  • 64GB capacity expands server memory for demanding workloads
  • DDR4 2933MHz speed delivers high bandwidth for data-intensive tasks
  • ECC registered design corrects errors to protect critical data integrity
  • 2V operation reduces power consumption in dense server environments
  • Backward compatible with 2133MHz 2400MHz 2666MHz systems for flexible deployment

64GB DDR4 ECC RDIMM for ThinkSystem ST550

This 64GB DDR4 2933MHz module is built for the Lenovo ThinkSystem ST550 server. It uses registered ECC technology required by Xeon SP Gen 2 platforms. Standard desktop systems cannot accept this memory type.

Capacity and registered headroom

A single 64GB stick adds substantial capacity for virtualisation or large datasets. Registered buffering reduces electrical load on the memory controller, allowing more modules per channel. Mixing with unbuffered DIMMs is not supported and will prevent boot.

288-pin DDR4 slot requirements

The module fits a standard 288-pin DDR4 slot and runs at 1.2V. Backward compatibility covers 2133, 2400 and 2666MHz bus speeds. No heat spreader is fitted, so airflow across the DIMM row must be maintained by the server chassis fans.

How it compares

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

Price $367.99
Typical for this category: the median of 21,161 items is $397.99.
Total capacity 64 GB
Higher than about 60% of the 20,941 comparable items (median 32 GB).
Price per GB $5.75 per GB
Cheaper than about 68% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameOWC
Part number2R9D42R464 GB
Total capacity64 GB
Product type288-Pin DDR4 ECC RDIMM
Performance
Rated speedDDR4 2933 (PC4 23400)
Memory
CAS latencyCL21
ECC supportYes
Buffer typeRegistered
Memory rank2Rx4
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Compatible systemsLenovo ThinkSystem (Xeon SP Gen 2) ST550

Other versions of this model

5 more in the same range

Questions about this item

Will the 2933MHz RDIMM run with 2133MHz ECC registered modules already in my ST550?

The module is backward compatible with 2133MHz, 2400MHz and 2666MHz registered ECC DIMMs; the system will clock all sticks to the lowest common speed.

How can I confirm the 64GB ECC registered DIMM is detected and error-correcting after installation?

Check the BIOS memory information or OS tools such as dmidecode; they should report 64GB, ECC type Registered and a speed of 2933MHz or the down-clocked value.

Does the single 288-pin RDIMM ship with a heat spreader or any extra brackets?

The module has no heat spreader and no additional brackets are included; only the DIMM itself is in the box.

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