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Two green DDR4 ECC UDIMM sticks, 32GB kit, no heat spreaders

NEMIX RAM

NEMIX RAM 32GB (2×16GB) DDR4 2666 ECC UDIMM CL19 1.2V Synology RS2421+ memory upgrade

SKU CH-3E51-FAQHE

32 GB kit of two 16 GB DDR4 2666 ECC UDIMM modules at 1.2 V, CL19, validated for Synology RS2421+

  • Total capacity32 GB (2 × 16 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL19
  • Buffer typeUnbuffered
  • Rated voltage1.2 V
  • 32 GB kit doubles NAS capacity for larger workloads
  • DDR4 2666 speed matches Synology RS2421+ specifications
  • ECC protection guards data integrity in mission-critical storage
  • 2 V operation keeps power draw low
  • 288-pin UDIMM design enables straightforward self-installation

Synology RS2421+ DDR4 ECC kit

This 32 GB kit contains two 16 GB DDR4 2666 ECC unbuffered UDIMMs built for the Synology RackStation RS2421+ and RS2421RP+. Each module runs at 1.2 V with CL19 latency and uses a 288-pin layout. The memory is validated for NAS workloads that demand error correction.

Sustained-load behaviour with ECC

Under continuous operation the ECC logic detects and corrects single-bit errors, preventing silent data corruption during long file transfers or backup jobs. Unbuffered topology keeps latency low while the 2Rx8 organisation maintains stable throughput across both DIMMs. Modules are stress-tested at rated speed before shipping.

Pre-installation checks for RS2421+

Confirm the NAS has two free UDIMM slots and that the firmware supports 32 GB total capacity. Verify the chassis can accept standard-height 288-pin sticks without a heat spreader. Ensure the system is powered down and disconnected before opening the memory compartment.

How it compares

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

Price $281.99
Cheaper than about 55% of the 21,161 comparable items (median $397.99).
Total capacity 32 GB (2 × 16 GB)
Typical for this category: the median of 20,941 items is 32 GB.
Price per GB $8.81 per GB
Typical for this category: the median of 20,941 items is $8.19 per GB.

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Specifications

Product
Brand nameNEMIX RAM
Product lineSynology Compatible Series NAS Memory
Model nameSynology DDR4 2666 MHz ECC Unbuffered UDIMM
Part numberME21300-628K2
Total capacity32 GB (2 × 16 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 items32 GB (2 × 16 GB) DDR4 2666 MHz PC4-21300 1Rx8 1.2 V CL19 288-PIN ECC Unbuffered UDIMM KIT

Questions about this item

How much power will the 1.20 V DDR4 2666 kit draw when the NAS runs continuously?

Each module operates at 1.20 V, the standard DDR4 voltage, so total power draw stays within the platform's normal memory budget for 32 GB.

What must the RS2421+ already have for this 288-pin ECC UDIMM kit to work?

The Synology RS2421+ needs free DDR4 UDIMM slots and a BIOS that accepts ECC unbuffered memory; the kit is validated for that platform.

Will the CL19 2666 MT/s modules run stably alongside any original sticks I keep in the RS2421+?

The kit is tested for the RS2421+/RS2421RP+; matching speed, voltage and ECC type lets the system train all populated slots together.

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