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 circuit board SODIMM module with black memory chips and gold edge connector

NEMIX RAM

NEMIX RAM 8GB DDR4 2666 ECC SODIMM Synology DS1621xs+ memory upgrade

SKU CH-ZTH4-8DAVR

8GB DDR4 2666 ECC SODIMM module tested for Synology DS1621xs+ NAS compatibility

  • Total capacity8 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL19
  • Buffer typeUnbuffered
  • Rated voltage1.2 V
  • ECC protection guards data integrity with built-in error correction
  • 2666 MHz DDR4 speed matches Synology DS1621xs+ specifications
  • 2 V low voltage reduces power draw and heat
  • 260-pin SODIMM form factor fits NAS memory slots directly
  • Major OEM chips from Samsung, Micron or Hynix ensure reliable operation

NEMIX RAM 8GB DDR4 ECC SODIMM for Synology DS1621xs+

This 8GB module is built specifically for the Synology DiskStation DS1621xs+ NAS. It uses DDR4 2666 (PC4-21300) memory with ECC error correction and an unbuffered design. The 260-pin SODIMM form factor fits the NAS memory slot directly.

Suits owners expanding a DS1621xs+

Buyers who need non-ECC modules or a different pin count should look elsewhere. Systems that require registered DIMMs or a voltage other than 1.20V cannot use this stick. The single 8GB capacity may not fill every slot in larger configurations.

ECC unbuffered DDR4 2666 with CL19 latency

The module operates at CL19 CAS latency and 1.20V using major OEM chips from Samsung Micron or Hynix. The 1Rx8 rank organisation is fixed by the part design. Confirm the NAS accepts unbuffered ECC SODIMMs before ordering.

How it compares

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

Price $58.99
Cheaper than about 75% of the 21,161 comparable items (median $397.99).
Total capacity 8 GB
Lower than about 80% of the 20,941 comparable items (median 32 GB).
Price per GB $7.37 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 SODIMM
Part numberMSE21300-818K1
Total capacity8 GB
Product type260-PIN DDR4 ECC SODIMM
Performance
Rated speedDDR4 2666 (PC4 21300)
Processor
ChipsetMajor OEM Samsung, Micron, Hynix
Memory
CAS latencyCL19
ECC supportYes
Buffer typeUnbuffered
Heat spreaderNo
Memory rank1Rx8
Power
Rated voltage1.2 V
Compatibility
Compatible systemsSynology
In the box
Included items8 GB (1 × 8 GB) DDR4 2666 MHz PC4-21300 1Rx8 1.2 V CL19 260-PIN ECC Unbuffered SODIMM

Questions about this item

Should I choose the single 8 GB module or add a second one for the DS1621xs+?

The module is sold as one 8 GB stick; adding a second identical module will enable dual-channel operation and double capacity to 16 GB if the NAS has a free slot.

What does the 2666 MT/s rating deliver inside the DS1621xs+?

The DS1621xs+ memory controller runs at 2666 MT/s, so this module operates at its rated speed without down-clocking, providing the full PC4-21300 bandwidth the system expects.

How does the 260-pin DDR4 ECC SODIMM interface limit performance?

The 260-pin DDR4 SODIMM form factor caps transfer rate at 2666 MT/s and voltage at 1.20 V, so the module cannot exceed the PC4-21300 ceiling even if a faster controller were present.

More in Model-Specific Memory Upgrades

Similar items