We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Green printed circuit board with black memory chips in a 288-pin DDR4 RDIMM form factor

OWC

OWC 32GB DDR4 2933MHz PC4-23400 CL21 1.2V 288pin ECC RDIMM ST550

SKU CH-256W-1FVXP

32 GB DDR4 ECC registered RDIMM at 2933 MHz for Lenovo ThinkSystem ST550 servers

  • Capacity32GB
  • Type288-Pin DDR4 ECC RDIMM
  • SpeedDDR4 2933 (PC4 23400)
  • CAS LatencyCL21
  • Voltage1.2V
  • ECCYes

Capacity 32GB

  • 32 GB capacity adds headroom for virtualised workloads
  • ECC registered design protects data integrity in server tasks
  • DDR4 2933 MHz CL21 matches Lenovo ST550 specifications
  • 2 V operation reduces power draw per module
  • Backward compatible with 2133, 2400 and 2666 MHz systems

Server-specific ECC RDIMM

This 32 GB DDR4 module runs at 2933 MHz with CL21 latency and 1.2 V operation. It uses a 288-pin registered ECC design built for Lenovo ThinkSystem ST550 servers with Xeon SP Gen 2 processors. The part replaces Lenovo numbers 01AG632, 4ZC7A08709 and 4ZC7A08742.

Workstation and server upgrades only

It suits administrators expanding memory in compatible ThinkSystem ST550 platforms or similar registered ECC environments. It will not work in standard desktop PCs, consumer motherboards or any system that requires unbuffered non-ECC DIMMs.

Fills a registered DIMM slot

The module plugs directly into a 288-pin DDR4 RDIMM slot and operates at 1.2 V. Backward compatibility covers 2133, 2400 and 2666 MHz bus speeds, so it can join existing slower memory populations without configuration changes. No heat spreader is fitted.

Highlights

  • 32 GB capacity adds headroom for virtualised workloads
  • ECC registered design protects data integrity in server tasks
  • DDR4 2933 MHz CL21 matches Lenovo ST550 specifications
  • 2 V operation reduces power draw per module
  • Backward compatible with 2133, 2400 and 2666 MHz systems

Specifications

BrandOWC
Part Number2R9D42R432GB
Capacity32GB
Type288-Pin DDR4 ECC RDIMM
SpeedDDR4 2933 (PC4 23400)
CAS LatencyCL21
Voltage1.2V
ECCYes
Buffered/RegisteredRegistered
Rank2Rx4
Heat SpreaderNo
Compatible SystemLenovo ThinkSystem (Xeon SP Gen 2) ST550

Other versions of this model

5 more in the same range

Same family, different memory, cooler or clock — compare before you commit.

Questions about this item

What Lenovo ThinkSystem server must I already own for this 32GB DDR4 2933MHz ECC RDIMM to work?

This module is validated for the Lenovo ThinkSystem ST550 with Xeon SP Gen 2 processors.

How does this PC4-23400 CL21 registered DIMM behave alongside slower DDR4 modules I may keep?

It is backward compatible with 2133MHz, 2400MHz and 2666MHz speeds; the system will run all modules at the lowest installed frequency.

How can I confirm the 32GB ECC registered module is operating correctly after installation?

Check the BIOS or OS memory report for 32GB capacity, 2933MHz speed, ECC active and registered mode detected.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.