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Green 288-pin DDR4 RDIMM module, 32GB capacity, no heat spreader

NEMIX RAM

NEMIX RAM 32GB DDR4 2666 ECC RDIMM CL19 2Rx8 Synology Compatible Memory Upgrade

SKU CH-4NAM-351G2

32 GB DDR4 2666 ECC registered DIMM with CL19 latency for Synology NAS upgrades

  • Total capacity32 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL19
  • Buffer typeRegistered
  • Rated voltage1.2 V
  • ECC protection guards data integrity in Synology NAS
  • 32 GB capacity expands memory for heavy workloads
  • DDR4 2666 speed matches system specifications
  • Registered RDIMM design ensures server-grade stability
  • 20 V operation reduces power consumption

Synology NAS ECC RDIMM Upgrade

This 32 GB DDR4 2666 module is built for Synology FlashStation NAS units that require registered ECC memory. It delivers 32 GB in a single 2Rx8 stick, letting administrators add capacity without filling every slot.

Registered DDR4 2666 limits

The DDR4 2666 interface caps transfer rates at PC4-21300, so throughput is bounded by that standard rather than by the module itself. Registered buffering adds a clock cycle of latency, which is normal for server platforms but prevents use in consumer boards that expect unbuffered DIMMs. ECC operation also requires a memory controller that supports error correction.

Single-rank 288-pin build

The module uses a bare green PCB without a heat spreader, relying on chassis airflow for cooling. Its 288-pin RDIMM keying fits only registered DDR4 slots, so it will not seat in UDIMM or SO-DIMM sockets. The 1.2 V operating voltage matches the DDR4 specification and keeps power draw predictable in dense NAS configurations.

How it compares

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

Price $225.99
Cheaper than about 57% of the 21,161 comparable items (median $397.99).
Total capacity 32 GB
Typical for this category: the median of 20,941 items is 32 GB.
Price per GB $7.06 per GB
Cheaper than about 57% of the 20,941 comparable items (median $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 RDIMM Registered Server Memory
Part numberMR21300-328K1
Total capacity32 GB
Product type288-Pin DDR4 RDIMM
Performance
Rated speedDDR4 2666 (PC4 21300)
Processor
ChipsetMajor OEM Samsung, Micron, Hynix
Memory
CAS latencyCL19
ECC supportYes
Buffer typeRegistered
Heat spreaderNo
Memory rank2Rx8
Power
Rated voltage1.2 V
Compatibility
Compatible systemsSynology
In the box
Included items32 GB (1 × 32 GB) DDR4 2666 MHz PC4-21300 2Rx8 1.2 V CL19 288-PIN ECC RDIMM Registered Server Memory

Questions about this item

Should I pick the single 32 GB module or add multiple sticks?

The module is sold as one 32 GB stick; add a second identical module only if your Synology NAS has a free slot and the manual confirms dual-channel support.

What does the 2666 MT/s rating deliver inside a Synology NAS?

The DDR4 2666 speed runs at the rated 2666 MT/s with CL19 latency, giving the NAS its maximum supported memory bandwidth for file serving and virtualization workloads.

How does the 288-pin ECC RDIMM interface limit compatibility?

The 288-pin DDR4 RDIMM form factor with registered ECC only fits servers and NAS units that explicitly support registered DIMMs; it will not work in standard desktop or laptop slots.

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