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 bare DDR4 UDIMM module with gold edge contacts and black memory chips

NEMIX RAM

NEMIX RAM 16GB DDR4 2666 ECC UDIMM CL19 1.2V memory upgrade

SKU CH-630A-RYK51

16GB DDR4 2666MHz ECC UDIMM module with CL19 latency for Synology RS2821RP+ NAS

  • Total capacity16 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL19
  • Buffer typeUnbuffered
  • Rated voltage1.2 V
  • 16 GB capacity expands NAS storage headroom
  • ECC UDIMM design guards data integrity under load
  • CL19 latency at 2666 MT/s sustains responsive throughput
  • 20 V operation reduces power draw in always-on systems
  • 288-pin DDR4 form factor fits Synology RS2821RP+ slots

Synology RS2821RP+ NAS upgrade

This 16 GB DDR4 2666 module is validated for the Synology RackStation RS2821RP+ NAS. It adds ECC error correction to protect data integrity in always-on storage workloads. The unbuffered UDIMM design fits the system memory slots without registered buffering.

288-pin UDIMM slot requirement

The stick occupies a single 288-pin DDR4 UDIMM slot and runs at the standard 1.2 V. No heat spreader is fitted so clearance inside the NAS chassis remains unchanged. The 2Rx8 organisation lets the memory controller access two ranks per channel for bandwidth efficiency.

Sustained load stability

Modules are stress tested under load before shipping to verify reliability during continuous NAS operation. ECC detection corrects single-bit errors that can accumulate during long uptime periods. CL19 latency and 1.2 V operation keep power draw steady throughout extended file serving or backup tasks.

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
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).

New to this? Buying memory and SSDs with crypto — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameNEMIX RAM
Product lineSynology Compatible Series NAS Memory
Model nameSynology DDR4 2666 MHz ECC Unbuffered UDIMM
Part numberME21300-628K1
Total capacity16 GB
Product type288-Pin DDR4 ECC UDIMM
Performance
Rated speedDDR4 2666 (PC4 21300)
Processor
ChipsetMajor OEM Samsung, Micron, Hynix
Memory
CAS latencyCL19
ECC supportYes
Buffer typeUnbuffered
Heat spreaderNo
Memory rank2Rx8
Power
Rated voltage1.2 V
Compatibility
Compatible systemsSynology
In the box
Included items16 GB (1 × 16 GB) DDR4 2666 MHz PC4-21300 2Rx8 1.2 V CL19 288-PIN ECC Unbuffered UDIMM

Questions about this item

Will the 2666 MHz DDR4 speed limit sustained throughput on the Synology RS2821RP+?

The module runs at DDR4 2666 (PC4-21300) with CL19 timing; the RS2821RP+ memory controller is designed for this exact speed, so the rated frequency is the practical ceiling under sustained load.

Does the lack of a heat spreader raise temperatures during all-day NAS operation?

The 1.2 V unbuffered UDIMM operates at standard JEDEC voltage without a spreader; typical NAS chassis airflow keeps temperatures within spec for continuous duty.

Must the RS2821RP+ already support ECC unbuffered UDIMM memory for this module to work?

Yes, the RS2821RP+ requires DDR4 ECC unbuffered UDIMMs; this 16 GB 2Rx8 CL19 kit matches that requirement exactly.

More in Model-Specific Memory Upgrades

Similar items