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Green circuit board with gold edge contacts and black memory chips

OWC

OWC 16GB DDR4 2933MHz ECC RDIMM Lenovo ThinkSystem ST550

SKU CH-495X-MAK66

16 GB DDR4-2933 ECC registered DIMM for Lenovo ThinkSystem ST550 servers

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

Capacity 16GB

  • 16GB DDR4 ECC RDIMM adds registered server capacity
  • 2933MHz CL21 speed handles demanding workloads reliably
  • 2V operation reduces power draw in Lenovo ST550
  • Backward compatible with 2133, 2400 and 2666MHz systems
  • Replaces Lenovo part numbers 01AG631, 4ZC7A08708 and 4ZC7A08741

16GB DDR4 ECC RDIMM for ST550

This 16GB DDR4 2933MHz module is built for the Lenovo ThinkSystem ST550 server platform. It carries ECC and registered buffering to meet the reliability demands of Xeon SP Gen 2 workstations and rack servers. The 2Rx8 organisation and 1.2V operation follow standard DDR4 server specifications.

Sustained load behaviour

ECC circuitry corrects single-bit errors on the fly while the register reduces electrical load on the memory controller during continuous operation. At CL21 latency and PC4-23400 throughput the module maintains stability across 2133MHz, 2400MHz and 2666MHz backward-compatible speeds. No heat spreader is fitted, so airflow in the ST550 chassis handles thermal management.

Upgrade context

The DIMM replaces Lenovo part numbers 01AG631, 4ZC7A08708 and 4ZC7A08741 when expanding or refreshing ST550 memory. It will not work in standard desktop boards or alongside unbuffered modules. Buyers who need consumer DDR4 or non-ECC memory should look elsewhere.

How it compares

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

Price $102.99
Cheaper than about 67% 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 $6.44 per GB
Cheaper than about 61% 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
Compatibility
Compatible systemsLenovo ThinkSystem (Xeon SP Gen 2) ST550

Other versions of this model

5 more in the same range

Questions about this item

How much power does the 1.2V DDR4 module draw when the ST550 runs continuously?

The module operates at 1.2V DDR4 standard voltage; registered ECC RDIMMs at this voltage typically draw only a few watts per stick under sustained load, keeping heat output low in the ST550 chassis.

What must the Lenovo ThinkSystem ST550 already have for this 288-pin RDIMM to work?

The ST550 must support DDR4 288-pin ECC registered memory and run a Xeon Scalable Gen 2 processor; unbuffered or non-ECC DIMMs cannot be mixed with this module.

Will this 2933MHz CL21 stick run with older 2133MHz or 2400MHz modules I keep in the ST550?

Yes, the module is backward compatible with 2133MHz, 2400MHz and 2666MHz speeds; the system will clock all installed DIMMs to the lowest common speed.

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