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
Four green DDR4 RDIMM sticks in anti-static tray

NEMIX RAM

NEMIX RAM 64GB (4x16GB) DDR4 2666 ECC RDIMM Synology FS3400

SKU CH-8SYF-MB45G

A 64 GB DDR4 2666 ECC RDIMM kit of four 16 GB modules built for Synology FlashStation FS3400 NAS

  • Total capacity64 GB (4 × 16 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL19
  • Buffer typeRegistered
  • Rated voltage1.2 V
  • 64 GB total capacity across four 16 GB modules
  • DDR4 2666 MHz speed rated at PC4-21300 bandwidth
  • ECC registered RDIMM design protects data integrity
  • 2 V operation at CL19 latency for efficient performance
  • 288-pin 1Rx4 modules validated for Synology FS3400 NAS

Synology FS3400 DDR4 Kit

This 64 GB kit contains four 16 GB DDR4 2666 ECC registered DIMMs built for the Synology FlashStation FS3400 NAS. It targets administrators who need validated, server-grade memory for a single supported platform.

1Rx4 ECC Registered Layout

Each module uses a 1Rx4 organisation with on-die ECC and a registered buffer, the exact layout the FS3400 memory controller expects. A different rank structure or unbuffered DIMM will not initialise on this system.

64 GB Total Capacity

The four-module set fills the FS3400 slots for 64 GB of addressable memory, enough for typical virtualization and file-service workloads. Larger datasets or heavier concurrent VM counts will exceed this limit and require a higher-capacity platform.

How it compares

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

Price $420.99
Typical for this category: the median of 21,161 items is $397.99.
Total capacity 64 GB (4 × 16 GB)
Higher than about 60% of the 20,941 comparable items (median 32 GB).
Price per GB $6.58 per GB
Cheaper than about 60% 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 RDIMM Registered Server Memory
Part numberMR21300-614K4
Total capacity64 GB (4 × 16 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 rank1Rx4
Power
Rated voltage1.2 V
Compatibility
Compatible systemsSynology
In the box
Included items64 GB (4 × 16 GB) DDR4 2666 MHz PC4-21300 1Rx4 1.2 V CL19 288-PIN ECC RDIMM Registered Server Memory KIT

Questions about this item

What does 2666MHz mean for my Synology FS3400?

The modules run at the 2666MHz speed the FS3400 memory controller expects, giving you the rated 64GB capacity across four slots without downclocking.

How does PC4-21300 affect performance in this NAS?

PC4-21300 is the DDR4-2666 bandwidth rating; the FS3400 uses it at the native 2666MHz data rate for the full 64GB kit.

Will the 288-pin RDIMM modules fit the FS3400 memory slots?

Yes, the 288-pin DDR4 RDIMM form factor matches the FS3400 DIMM sockets and the registered 1Rx4 design is what the system requires.

More in Model-Specific Memory Upgrades

Similar items