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Green circuit board with gold contacts and black memory chips

OWC

OWC 16GB DDR4 2666 ECC UDIMM 2Rx8 CL19 1.2V memory upgrade

SKU CH-GRA4-VMJX1

A 16 GB DDR4 2666 ECC UDIMM module with CL19 latency and 1.2 V operation, validated for Synology RackStation RS2421+ and RS2421RP+ systems

  • Capacity16GB (1 x 16GB)
  • Type288-Pin DDR4 ECC UDIMM
  • SpeedDDR4 2666 (PC4 21300)
  • CAS LatencyCL19
  • Voltage1.2V
  • ECCYes
  • 16 GB capacity expands NAS multitasking headroom
  • DDR4 2666 speed matches Synology RS2421+ specifications
  • ECC protection guards data integrity in 24/7 operation
  • 2 V low voltage reduces system power draw
  • 288-pin UDIMM fits supported Synology RackStation slots

Synology RackStation memory upgrade

This OWC module adds 16GB of DDR4 ECC memory to compatible Synology RackStation RS2421+ and RS2421RP+ units. It operates at 2666MHz with a CL19 latency and runs at the standard 1.2V. The unbuffered 288-pin UDIMM format installs directly into the available memory slots.

Suited for NAS expansion, not generic PCs

The part is validated for the two listed RackStation models, so administrators expanding those systems can install it with confidence. Builders assembling custom servers or upgrading standard desktop motherboards should verify their platform accepts DDR4 ECC UDIMMs before purchasing.

ECC UDIMM with 2Rx8 organisation

Error-correcting code and a dual-rank 2Rx8 layout are the defining specifications that determine compatibility with the target Synology units. Systems requiring registered DIMMs or non-ECC memory will not support this module.

Points forts

  • 16 GB capacity expands NAS multitasking headroom
  • DDR4 2666 speed matches Synology RS2421+ specifications
  • ECC protection guards data integrity in 24/7 operation
  • 2 V low voltage reduces system power draw
  • 288-pin UDIMM fits supported Synology RackStation slots

Caractéristiques

BrandOWC
Part Number2E6D42R816GB
Capacity16GB (1 x 16GB)
Type288-Pin DDR4 ECC UDIMM
SpeedDDR4 2666 (PC4 21300)
CAS LatencyCL19
Voltage1.2V
ECCYes
Buffered/RegisteredUnbuffered
Rank2Rx8
Heat SpreaderNo
Compatible SystemSynology RackstationRS2421+
Synology RackstationRS2421RP+

Questions sur cet article

Does this 288-pin DDR4 UDIMM fit the memory slots in a Synology RackStation RS2421+ or RS2421RP+?

Yes, the module is built to the 288-pin DDR4 UDIMM form factor used by those RackStation models, so it seats directly in the standard DIMM slots.

What is the correct way to install the module, and what step do people often miss?

Power off the NAS, open the chassis, align the notch on the 288-pin edge connector with the slot key, press firmly until both retention clips click, then close the case before powering on.

Will this ECC UDIMM need any firmware updates or component replacements during its service life?

The memory itself has no moving parts or firmware; it requires no scheduled maintenance or replacement unless a hardware fault occurs.

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