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Two green DDR4 ECC UDIMM sticks, 288-pin, no heat spreader

OWC

OWC 16GB (2x8GB) DDR4 2666 ECC UDIMM for Synology RackStation RS2821RP+ memory upgrade

SKU CH-65N6-YD51Z

16GB DDR4 ECC UDIMM kit at 2666MHz CL19 for Synology RackStation RS2821RP+ NAS upgrades

  • Capacity16GB (2 x 8GB)
  • Type288-Pin DDR4 ECC UDIMM
  • SpeedDDR4 2666 (PC4 21300)
  • CAS LatencyCL19
  • Voltage1.2V
  • ECCYes

Capacity 16GB (2 x 8GB)

  • 16GB dual-channel kit doubles NAS memory capacity for heavier workloads
  • ECC UDIMM design detects and corrects single-bit errors to protect data integrity
  • DDR4 2666 CL19 at 1.2V matches Synology RS2821RP+ specifications exactly
  • JEDEC and RoHS compliant modules validated for warranty-safe upgrades
  • Backward compatible with 2133 and 2400MHz systems for flexible deployment

Synology RS2821RP+ 16GB DDR4 Kit

This 16GB kit contains two 8GB DDR4 2666 ECC UDIMM modules built for the Synology RackStation RS2821RP+. It targets NAS administrators who need to expand system memory for virtualisation, container workloads or large file caches. The unbuffered design matches the platform's memory controller exactly.

ECC Unbuffered DDR4 2666 CL19

The decisive specification is ECC unbuffered DDR4 at 2666 MT/s with CL19 latency. The RS2821RP+ requires ECC UDIMMs; registered or non-ECC modules will not function. This kit meets the JEDEC PC4-21300 standard and operates at 1.2 V, ensuring compatibility without configuration changes.

Tool-free DIMM installation

Installation consists of opening the chassis, seating each 288-pin module into the vacant slots until the retention clips engage, and closing the cover. No heat spreaders are present, so clearance is minimal. The common error is mixing these sticks with existing non-ECC or registered memory, which prevents the system from booting.

Highlights

  • 16GB dual-channel kit doubles NAS memory capacity for heavier workloads
  • ECC UDIMM design detects and corrects single-bit errors to protect data integrity
  • DDR4 2666 CL19 at 1.2V matches Synology RS2821RP+ specifications exactly
  • JEDEC and RoHS compliant modules validated for warranty-safe upgrades
  • Backward compatible with 2133 and 2400MHz systems for flexible deployment

Specifications

BrandOWC
Part Number2E6D41R8016P
Capacity16GB (2 x 8GB)
Type288-Pin DDR4 ECC UDIMM
SpeedDDR4 2666 (PC4 21300)
CAS LatencyCL19
Voltage1.2V
ECCYes
Buffered/RegisteredUnbuffered
Rank1Rx8
Heat SpreaderNo
Compatible SystemSynology RackstationRS2821RP+

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Questions about this item

What does 2666 MHz mean for my RS2821RP+ in daily use?

The modules run at 2666 MHz with CL19 timing, giving the NAS its rated memory bandwidth while the ECC logic corrects single-bit errors on the fly.

How does the DDR4 288-pin UDIMM interface limit speed in this system?

The 288-pin DDR4 UDIMM slot caps transfer rate at 2666 MHz; the kit will also run at 2133 MHz or 2400 MHz if the platform requires a lower speed.

Will the 288-pin sticks fit the RS2821RP+ memory slots without a heat spreader?

Yes, the bare 288-pin UDIMMs are the exact form factor Synology specifies for the RS2821RP+ and install directly into the DIMM slots.

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