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Green printed circuit board with black memory chips in a single row along one side, gold edge contacts at the bottom

OWC

OWC 16GB DDR4 2133MHz CL15 ECC Registered RDIMM 2Rx4 288-pin 1.2V memory upgrade

SKU CH-KH5S-0CSZ1

16 GB DDR4 2133 MHz CL15 ECC registered RDIMM for compatible Lenovo ThinkServer models

  • Total capacity16 GB
  • Rated speedDDR4 2133 (PC4 17000)
  • CAS latencyCL15
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank2Rx4
  • ECC registered design protects data integrity in server workloads
  • 16 GB capacity expands memory for demanding applications
  • DDR4 2133 MHz CL15 speed matches system specifications
  • 2 V operation reduces power draw and heat
  • Validated for Lenovo ThinkServer RD350 RD450 RD550 RD650 TD350

Lenovo ThinkServer ECC RDIMM upgrade

This 16GB DDR4 2133MHz CL15 registered ECC module is built for Lenovo ThinkServer RD350, RD450, RD550, RD650 and TD350 systems running E5-2600 v3 processors. It targets administrators who need to expand memory capacity in existing rack or tower servers without replacing the platform.

Registered ECC with 2Rx4 organisation

The registered buffer and error-correcting code protect data integrity in multi-DIMM configurations typical of server workloads. The 2Rx4 rank structure allows higher density per channel while the 1.2V operating voltage matches the platform's standard power envelope. No heat spreader is fitted, so airflow in the server chassis handles cooling.

288-pin DIMM installs in standard server slots

Installation follows the usual DIMM procedure: align the notch, press until the retention clips engage, and verify seating. The module cannot be mixed with unbuffered memory, and it will not function in standard desktop motherboards. Confirm the server's qualified vendor list or the listed Lenovo part numbers (46W0795, 46W0796, 4X70F28590, 4X70G78062, 95Y4821) before ordering.

How it compares

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

Price $112.99
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 $7.06 per GB
Cheaper than about 57% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameOWC
Part number2R1D42R416 GB
Total capacity16 GB
Product type288-Pin DDR4 ECC RDIMM
Performance
Rated speedDDR4 2133 (PC4 17000)
Memory
CAS latencyCL15
ECC supportYes
Buffer typeRegistered
Memory rank2Rx4
Heat spreaderNo
Power
Rated voltage1.2 V

Other versions of this model

5 more in the same range

Questions about this item

Will the 2Rx4 ECC RDIMM need any firmware updates or reconfiguration after installation in a ThinkServer?

No firmware update is required; the module follows JEDEC DDR4 2133 CL15 1.2 V specs and the registered buffer handles address loading automatically.

What electrical limit appears first when the DIMM runs at full 2133 MHz continuously?

The 1.2 V supply rail and the registered buffer’s drive strength set the ceiling; sustained throughput stays within the JEDEC PC4-17000 envelope.

How much extra heat does a 16 GB registered DIMM add to a ThinkServer chassis under all-day load?

Without a heat spreader the module relies on server airflow; at 1.2 V DDR4 power draw remains low enough for standard ThinkServer cooling.

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