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Green rectangular DDR4 RDIMM module with black chips on both sides no heat spreader 288 gold pins

OWC

OWC 16GB DDR4 2933MHz CL21 ECC Registered RDIMM memory upgrade

SKU CH-QFV9-VEDZQ

16GB DDR4 2933MHz CL21 ECC Registered RDIMM for Lenovo ThinkSystem Xeon SP Gen 2 servers

  • Total capacity16 GB
  • Rated speedDDR4 2933 (PC4 23400)
  • CAS latencyCL21
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank2Rx8

Capacity 16GB

  • ECC registered design prevents data corruption in critical workloads
  • 2933 MHz DDR4 speed with CL21 latency delivers responsive server performance
  • 2 V operation reduces power draw in dense configurations
  • Validated for Lenovo ThinkSystem SD530, SD650, SN550, SN850 and SR630
  • Backward compatible with 2133, 2400 and 2666 MHz platforms

Targeted Server Memory Upgrade

This 16GB DDR4 2933MHz ECC Registered RDIMM is built for Lenovo ThinkSystem servers using Xeon SP Gen 2 processors. It fits the SD530, SD650, SN550, SN850 and SR630 models and replaces Lenovo part numbers 01AG631, 4ZC7A08708 and 4ZC7A08741. The module runs at 1.2V with CL21 latency and uses a 288-pin 2Rx8 layout.

Capacity and Speed Headroom

A single 16GB stick adds substantial memory to multi-socket server configurations, supporting virtualisation workloads and large datasets. Rated at 2933MHz (PC4-23400), it also operates at 2666MHz, 2400MHz and 2133MHz when the platform requires a lower speed. ECC and register logic protect data integrity but add latency, so it will not suit unbuffered desktop boards or consumer laptops.

Upgrade Path and Compatibility Limits

The module directly replaces the three Lenovo part numbers listed above, letting you extend existing infrastructure or fill empty slots during a new build. It cannot be mixed with unbuffered memory and will not work in standard desktop PCs or non-ECC workstations. Buyers needing higher per-slot density or faster speeds must verify platform support before ordering.

How it compares

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

Price $116.99
Cheaper than about 66% 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 $7.31 per GB
Cheaper than about 55% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameOWC
Part number2R9D42R816 GB
Total capacity16 GB
Product type288-Pin DDR4 ECC RDIMM
Performance
Rated speedDDR4 2933 (PC4 23400)
Memory
CAS latencyCL21
ECC supportYes
Buffer typeRegistered
Memory rank2Rx8
Heat spreaderNo
Power
Rated voltage1.2 V

Other versions of this model

5 more in the same range

Questions about this item

Will this 2933MHz CL21 1.2V DDR4 RDIMM run correctly alongside my existing 2666MHz modules in a ThinkSystem SR630?

Yes, the module is backward compatible with 2133MHz, 2400MHz and 2666MHz speeds, so it will operate at the lower speed of the installed DIMMs in a ThinkSystem SR630.

How can I confirm the 16GB ECC Registered DIMM is detected and functioning after installation in my SN550?

Check the system BIOS or UEFI memory configuration screen; it should show 16GB per module at 2933MHz with ECC Registered status and correct 2Rx8 rank indication.

Does the 288-pin RDIMM arrive alone, or are any brackets, cables or additional parts included for the SD650?

Only the 16GB DDR4 2933MHz CL21 1.2V 288-pin ECC Registered RDIMM is supplied; no brackets, cables or extra components are included.

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