DS920+ compatible RAM upgrade

DS920+ compatible RAM upgrade

System Memory 4 GB DDR4
Memory Module Pre-installed – Soldered 4 GB (4 GB x 1)
Total Memory Slots 1
Memory Expandable up to 8 GB (4 GB + 4 GB) official

The max Synology recommends is 8GB DDR4. But you CPU spec says you could in theory upgrade up to 20GB.


D4NESO-2666-4G4GB                   UK   US

DDR4-2666 non-ECC unbuffered SO-DIMM
EAN: 4711174723669

Applied Models: RS820RP+, RS820+, DS2419+, DS1819+, DS1618+, DS920+, DS720+, DS420+, DS220+, DVA3219

Samsung sticks

Samsung M471A2K43CB1    UK   USA


Crucial RAM alternatives:

The max I have found is 20GB (4GB +16GB) – Or try adding 32GB + 4GB


People said it works: CT16G48FD8266


Crucial 4GB DDR4-2666 SODIMM         UK     USA  
Configuration ID: CT12553660
DDR4 PC4-21300 • CL=19 • Single Ranked • x8 based • Unbuffered • NON-ECC • DDR4-2666 • 1.2V • 512Meg x 64 •

Crucial 8GB DDR4-2666 SODIMM         UK     USA  
Configuration ID: CT12529382
DDR4 PC4-21300 • CL=19 • Single Ranked • x8 based • Unbuffered • NON-ECC • DDR4-2666 • 1.2V • 1024Meg x 64 •


16GB CT16G4SFD8266.    UK     USA  

Crucial CT16G4SFD8266 16 GB (DDR4, 2666 MT/s, PC4-21300, Dual Rank x8, SODIMM, 260-Pin) 



Crucial 16GB DDR4-2666 SODIMM         UK     USA  
Configuration ID: CT12529368
DDR4 PC4-21300 • CL=19 • Dual Ranked • x8 based • Unbuffered • NON-ECC • DDR4-2666 • 1.2V • 2048Meg x 64 •



It work from 4GB to 20GB

Crucial 16GB DDR4-2666 SODIMM (CT16G4SFD8266)


I bought this from our local (ala amazon) here in the Philippines.



How to do it:

Add a RAM Module on DiskStation
The optional Synology DDR4 RAM module is designed for DiskStation memory expansion. Follow the steps
below to install, check, or remove a RAM module on your DiskStation.
To install the RAM module:

1 Shut down your Synology NAS. Disconnect all cables from your Synology NAS to prevent possible damage.
2 Remove the hard drive trays from the drive bays. An empty memory slot is located on the inner right side of
your Synology NAS.

3 Insert the new memory module into the empty slot:
a Align the small gap between the gold connectors of the memory module with the notch on the empty slot.
Insert the memory module into the slot. Make sure that the module is properly inserted.
b Gently push down the memory module until you hear a click.

4 Insert the drive trays back into the drive bays.
5 Reconnect the cables removed in step 1, then press the power button to turn on your Synology NAS

To make sure DiskStation recognizes the new memory capacity:
1 Install DiskStation Manager (DSM). (See the next chapter for more information.)
2 Log in to DSM as admin or a user belonging to the administrators group.
3 Check Total Physical Memory in Control Panel > Info Center.
If your DiskStation does not recognize the memory or does not start up successfully, confirm that the memory is
installed correctly




Feedback from pioneers:

My DS920+ recognized all of this memory and seems to be working fine
Corsair Vengeance Performance Memory Kit 8GB (1x8GB) ddr4 2666MHz CL18 Unbuffered SODIMM CMSX8GX4M1A2666C18


Feedback from David- what didn’t work


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11 thoughts on “DS920+ compatible RAM upgrade

  1. Hi Robbie,

    I was using 4 GB of crucial RAM as an upgrade for my DS920+ but last week it threw up errors and caused the NAS to abnormally shut down twice. so I removed it. I am wondering whether to ever use crucial again, to be honest. I saw about the Samsung ram (apparently it is the same or very close to the RAM that Synology uses – almost as a rebadge). is this true?

    I am tempted to get some 16 GB RAM, would prefer Samsung if possible, for the above reasons. not keen on just 4 GB synology ram. may consider crucial if my only choice (although I gather the CL19 RAM from them can cause issues).

    Can you recommend Samsung (or any reliable RAM if Samsung is not available) to work well with my DS920+, please? (in 2024 the Samsung ram that people were talking about all but seems to no longer be available)

  2. Riporto la mia esperienza:

    Crucial CT8G4SFRA266 8GB DDR4 2666 MHz CL19: funzionante
    Crucial CT16G4SFRA266 16GB DDR4 2666 MHz CL19: luce blu lampeggiante, no boot

  3. Does it have to be 2666 mhz to work with the 920+?
    I bought a 16gb 3200 mhz Crucial CT16G4SFRA32A and it doesn’t boot with it installed but just keeps flashing blue.