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Green rectangular circuit board with gold edge contacts and black memory chips, no heat spreader

OWC

OWC 32GB DDR4 2400MHz CL17 ECC Registered RDIMM 2Rx4 memory upgrade

SKU CH-ATWW-5A40G

32 GB DDR4 ECC registered DIMM at 2400 MHz CL17 for Lenovo ThinkServer RD350, RD450, RD550, RD650 and TD350

  • Capacity32GB
  • Type288-Pin DDR4 ECC RDIMM
  • SpeedDDR4 2400 (PC4 19200)
  • CAS LatencyCL17
  • Voltage1.2V
  • ECCYes
  • 32 GB capacity expands server memory for larger workloads
  • DDR4 2400 MHz CL17 delivers reliable registered ECC performance
  • 2 V operation reduces power draw in dense configurations
  • 2Rx4 288-pin RDIMM fits Lenovo ThinkServer RD350 RD450 RD550 RD650 TD350
  • Replaces Lenovo part numbers 46W0832 46W0833 46W0835 4X70G88320 4X70M09263

System-Specific Server Memory

This 32 GB DDR4 module is built for Lenovo ThinkServer platforms based on the E5-2600 v4 family, covering the RD350, RD450, RD550, RD650 and TD350 models. It operates at 2400 MHz with CL17 latency and 1.2 V power draw. The registered ECC design targets workloads that require error correction and signal buffering.

Registered ECC Architecture

The RDIMM format adds a register between the memory controller and the DRAM chips, reducing electrical load on the server bus. ECC circuitry detects and corrects single-bit errors, protecting data integrity in continuous-operation environments. This module cannot be mixed with unbuffered DIMMs and will not function in standard desktop mainboards.

2Rx4 Rank Configuration

The dual-rank 2Rx4 organisation determines how the memory controller addresses the chips and directly affects maximum population rules for each ThinkServer model. Verify the platform's supported rank-per-channel limits before installing multiple modules.

Highlights

  • 32 GB capacity expands server memory for larger workloads
  • DDR4 2400 MHz CL17 delivers reliable registered ECC performance
  • 2 V operation reduces power draw in dense configurations
  • 2Rx4 288-pin RDIMM fits Lenovo ThinkServer RD350 RD450 RD550 RD650 TD350
  • Replaces Lenovo part numbers 46W0832 46W0833 46W0835 4X70G88320 4X70M09263

Specifications

BrandOWC
Part Number2R4D42R432GB
Capacity32GB
Type288-Pin DDR4 ECC RDIMM
SpeedDDR4 2400 (PC4 19200)
CAS LatencyCL17
Voltage1.2V
ECCYes
Buffered/RegisteredRegistered
Rank2Rx4
Heat SpreaderNo
Compatible SystemLenovo ThinkServer (E5-2600 v4) RD350
Lenovo ThinkServer (E5-2600 v4) RD450
Lenovo ThinkServer (E5-2600 v4) RD550
Lenovo ThinkServer (E5-2600 v4) RD650
Lenovo ThinkServer (E5-2600 v4) TD350

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Questions about this item

Will the ECC registered 2Rx4 RDIMM need any periodic maintenance or replacement during its service life?

The module has no moving parts and no heat spreader, so it requires no scheduled maintenance; replacement is only needed if a memory test reports correctable or uncorrectable ECC errors.

What is the first limit reached when the 2400 MHz CL17 module runs at full load continuously?

The registered buffer and ECC logic add one cycle of latency, so sustained throughput tops out at the JEDEC PC4-19200 data rate of 2400 MT/s.

How much heat and power does a 32 GB 1.2 V DDR4 RDIMM produce when installed in a ThinkServer RD550 running 24/7?

At 1.2 V the module draws roughly 3–4 W, generating modest heat that the server's existing airflow handles without extra cooling.

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