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 and gold edge connectors

OWC

OWC 16GB DDR4 2666MHz ECC RDIMM Lenovo ThinkSystem SR670 SR850 SR860 SR950 ST550

SKU CH-6HDB-EHD6P

16 GB DDR4-2666 ECC registered DIMM for Lenovo ThinkSystem SR670, SR850, SR860, SR950 and ST550 servers

  • Capacity16GB
  • Type288-Pin DDR4 ECC RDIMM
  • SpeedDDR4 2666 (PC4 21300)
  • CAS LatencyCL19
  • Voltage1.2V
  • ECCYes
  • 16GB DDR4 2666MHz CL19 ECC RDIMM for reliable server performance
  • 2V low-voltage operation reduces power draw in Lenovo ThinkSystem SR670 SR850 SR860 SR950 ST550
  • Registered 2Rx8 design with error correction protects data integrity in Xeon SP Gen 1 systems
  • Backward compatible with 2133MHz and 2400MHz speeds for flexible deployment
  • Replaces Lenovo part numbers 01AG618 4X70P98202 7X77A01303 for direct upgrade compatibility

Server memory upgrade

This 16 GB DDR4 2666 MHz ECC registered DIMM is built for Lenovo ThinkSystem servers including the SR670, SR850, SR860, SR950 and ST550. It targets administrators who need to expand capacity or replace failed modules in Xeon SP Gen 1 platforms. The module will not work in standard desktop computers and cannot be mixed with unbuffered memory.

Thermals and power

Operating at 1.2 V with CL19 latency, the module runs at standard DDR4 voltage without a heat spreader. Registered buffering reduces electrical load on the memory controller, helping keep power draw predictable in multi-DIMM configurations. No active cooling is required beyond normal server airflow.

Replacement scope

The DIMM replaces Lenovo part numbers 01AG618, 4X70P98202 and 7X77A01303 and is backward compatible with 2133 MHz and 2400 MHz slots. The upgrade is worthwhile when adding capacity to existing channels or swapping out slower modules in the supported ThinkSystem models. Buyers who need unbuffered memory or desktop compatibility should look elsewhere.

Highlights

  • 16GB DDR4 2666MHz CL19 ECC RDIMM for reliable server performance
  • 2V low-voltage operation reduces power draw in Lenovo ThinkSystem SR670 SR850 SR860 SR950 ST550
  • Registered 2Rx8 design with error correction protects data integrity in Xeon SP Gen 1 systems
  • Backward compatible with 2133MHz and 2400MHz speeds for flexible deployment
  • Replaces Lenovo part numbers 01AG618 4X70P98202 7X77A01303 for direct upgrade compatibility

Specifications

BrandOWC
Part Number2R6D42R816GB
Capacity16GB
Type288-Pin DDR4 ECC RDIMM
SpeedDDR4 2666 (PC4 21300)
CAS LatencyCL19
Voltage1.2V
ECCYes
Buffered/RegisteredRegistered
Rank2Rx8
Heat SpreaderNo
Compatible SystemLenovo ThinkSystem (Xeon SP Gen 1) SR670
Lenovo ThinkSystem (Xeon SP Gen 1) SR850
Lenovo ThinkSystem (Xeon SP Gen 1) SR860
Lenovo ThinkSystem (Xeon SP Gen 1) SR950
Lenovo ThinkSystem (Xeon SP Gen 1) 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

How do I install the 288-pin DDR4 ECC RDIMM in a Lenovo ThinkSystem SR670, and what step is often missed?

Power down the server, open the chassis, align the module notch with the slot key, press firmly until the ejector tabs click, then verify in BIOS that the 2666MHz speed and ECC are recognised; the step often missed is confirming the registered DIMM is seated in a supported slot population order for the Xeon SP Gen 1 platform.

What maintenance or replacement will the 16GB 2Rx8 CL19 module need over its service life?

No routine maintenance is required; if a module fails, replace it with an identical 16GB DDR4 2666MHz ECC registered 2Rx8 part to keep rank balance and error-correction consistency across the memory channels.

What limit appears first when the RDIMM runs sustained workloads at 1.2V in a ThinkSystem SR850?

The thermal envelope of the unbuffered PCB without a heat spreader typically becomes the limiting factor before the 2666MHz data rate or CL19 latency thresholds are reached.

Also in this aisle

People compared these

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