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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

  • Total capacity16 GB (2 × 8 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • CAS latencyCL19
  • Rated voltage1.2 V
  • Buffer typeUnbuffered
  • Memory rank1Rx8

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.

How it compares

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

Price $118.99
Cheaper than about 65% of the 21,161 comparable items (median $397.99).
Total capacity 16 GB (2 × 8 GB)
Lower than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $7.44 per GB
Cheaper than about 55% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameOWC
Part number2E6D41R8016P
Total capacity16 GB (2 × 8 GB)
Product type288-Pin DDR4 ECC UDIMM
Performance
Rated speedDDR4 2666 (PC4 21300)
Memory
CAS latencyCL19
ECC supportYes
Buffer typeUnbuffered
Memory rank1Rx8
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Compatible systemsSynology RackstationRS2821RP+

Other versions of this model

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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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