Synology DS423+ compatible RAM upgrade

Synology DS423+ compatible RAM upgrade

The Synology DS423+ is a powerful and reliable NAS device that is designed for small and medium-sized businesses. It comes with 2 GB of DDR4 non-ECC memory, with 2 GB of it soldered to the board, and one memory slot available for upgrades. The maximum memory capacity is 6 GB, which means that you can add an additional 4 GB to the pre-installed 2 GB.

If you’re looking to upgrade your Synology DS423+ memory, there are official and unofficial options available. Synology offers their own memory upgrades that are compatible with the device, which are non-ECC unbuffered SODIMMs. The model number for their 4 GB memory upgrade is D4NESO-2666-4G, and it is compatible with various Synology NAS devices, including the DS423+.

However, if you’re looking for other options, there are community-tested RAM upgrades that are also compatible with the DS423+. These upgrades are unofficial, but they have been tested by the NAS community and have shown to work on the device. Here are some of the RAM upgrades that have been tested:

  • Crucial 4GB, 8GB, 16GB, and 32GB*
  • TimeTec 4GB, 8GB, and 16GB
  • Kingston 4GB, 8GB, and 16GB

*Please note that the 32GB option is untested and to be confirmed (TBC).

The community-tested RAM upgrades come from various manufacturers and have different memory capacities and speeds. Some of the upgrades listed above have been tested on DSM 7.1.1-42962 Update 1, DSM 7.1, and DSM 7.1.1-42962 Update 3.

Here is how ds423+ looks like by default:

System Memory 2 GB DDR4 non-ECC
Memory Module Pre-installed 2 GB (soldered)
Total Memory Slots 1
Maximum Memory Capacity 6 GB (2+ 4 GB)

Official Synology memory upgrades



  • DDR4 non-ECC Unbuffered SODIMM
  • EAN: 4711174723669
  • Capacity: 4GB

Applied Models:

  • 23 series:DS423+
  • 20 series:RS820RP+, RS820+, DS920+, DS720+, DS420+, DS220+
  • 19 series:DS2419+, DS2419+II, DS1819+, DVA3219
  • 18 series:DS1618+


CHECK THIS PAGE BELOW (community tested RAM list):

Synology NAS compatible RAM


Unnoficial RAMย 

Tested in our Studion on DS920+ and it should work on ds423+

DS423+ DDR4-2666ย non-ECC unbuffered SO-DIMM 260pin 1.2V D4NESO-2666-4G Crucial 4GBย โ€“ย Buy HereTimeTec 4GB โ€“ย Buy Here

Kingston 4GB-ย Buy Here

Crucial 8GBย โ€“ย Buy Here

TimeTec 8GB โ€“ย Buy Here

Kingston 8GB-ย Buy Here

Crucial 16GBย โ€“ย Buy Here

TimeTec 16GB โ€“ย Buy Here

Kingston 16GB-ย Buy Here

Crucial 32GB* โ€“ย Buy Here



Here are NAS community tests :

DSM 7.1.1-42962 Update 1 Micron 8gb 2666 MTA8ATF1G64HZ-2G6B1 YES NO [LINK]2nd Feb
DSM 7.1 Samsung D4NESO-2666-4G DDR4 CL19 2666MHz CL19 4GB YES NO [LINK]6th Jan
DSM 7.1.1-42962 Update 3 SAMSUNG M471A1K43CB1-CTD 8GB DDR4 2666MHz YES YES [LINK]9th Jan
7.1.1 Crucial 16Gb 3200MHz CL22 CT16G4SFRA32A NO YES [LINK]8th Feb
7.1.1 Crucial 16GB CT16G4SFRA266 YES NO [LINK]16th Feb
7.1.1-42962 Update 2 Corsair 16GB 2666 C18 CMSX16GX4M1A2666C18 YES NO [LINK]10th Feb
7.1.1 Crucial 16gb DDR4 2400 (PC4 19200) CT16G4SFD824A YES NO [LINK]6th Jan
DSM 7.1.1-42962 Update 3 Timetec 16GB DDR4 2666MHz Non-ECC Unbuffered 1.2V CL19 2Rx8 Dual Rank 260 Pin SODIMM 76HN26NUS1R YES NO [LINK]6th Jan
7.1.1-42962 Update 2 Kingston 8Gb DDR4 KCP426SS8/8 YES YES [LINK]6th Jan
DSM 7.1.1-42962 Update 1 Crucial 4GB DDR4 2666MHz CL19 CT4G4SFS8266 YES NO [LINK]6th Jan
DSM 7.1.1-42962 Update 3 Crucial 16GB 2666MHz DDR4 SODIMM CT16G4SFRA266 YES NO [LINK]6th Jan
7.1.1 Update 3 crucial 16GB DDR4 2666MHz CL19 CT16G4SFD8266 YES NO [LINK]6th Jan
7.1.1-42962 Update 2 Samsung 16GB DDR4 PC4-21300 ,CL=19 ,Unbuffered ,NON-ECC M471A2K43CB1-CTD YES NO [LINK]6th Jan
7.1.1-42962 Corsair Vengeance 16GB DDR4 2400MHz CL16 CMSX16GX4M1A2400C16 YES NO [LINK]6th Jan
7.1.1 Update 1 Crucial 4GB DDR4 2666MHz CT4G4SFS8266 YES NO [LINK]6th Jan
7.1-42661 Update 4 Crucial 16GB DDR4 2400 SODIMM 1.2V (1x16GB) CT16G4SFD824A YES NO [LINK]6th Jan
DSM 7.1.1-42962 Update 3 Crucial 16GB 2666 DDR4 CT16G4SFD8266 YES NO [LINK]6th Jan
7.1.1 Update 2 Micron 16GB DDR4 2400MHz 16ATF2G64HZ-2G6E1 YES NO [LINK]6th Jan
DSM 7.1-42661 Crucial RAM 16GB DDR4 2666 MHz CL19 CT16G4SFRA266 YES NO [LINK]6th Jan


How to Add a Memory Module to Synology NAS

Optional Synology memory module is designed to expand the memory of your Synology NAS. Follow the steps below to install, check, or remove a memory module on your Synology NAS.

To install the memory module

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


  • When you remove the drive trays, sensitive internal components are exposed. Avoid touching anything other than the memory assembly when removing or adding memory.
  1. Insert the new memory module into the empty slot:
    1. 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.
    2. Gently push down the memory module until you hear a click.


  • Hold the memory module by its edges and avoid touching the gold connectors.
  • Synology will not provide full product warranty or technical support if a non-Synology memory module is used for memory upgrade.
  1. Insert the drive trays back into the drive bays.
  2. Reconnect the cables removed in step 1, then press the power button to turn on your Synology NAS.

To make sure your Synology NAS recognizes the new memory capacity

  1. Install DiskStation Manager (DSM). Please see “Install DSM on Synology NAS” for more information.
  2. Sign in to DSM asย adminย or a user belonging to the administrators group.
  3. Go toย Control Panelย >ย Info Centerย and checkย Total Physical Memory.

If your Synology NAS does not recognize the memory or does not start up successfully, please make sure that the memory module is installed correctly.


To remove the memory module

  1. Follow step 1 to 2 of the “To install the memory module” section to shut down your Synology NAS, disconnect the cables and remove the drive trays.
  2. Push the levers on both sides of the memory module outward. The memory module will be released from its slot.
  3. Hold the memory module by its edges and remove it from the slot.
  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.



There are several ways to check the memory is working on your Synology DS423+ correctly. One easy method that can be done very quickly is using theย Synology Memory Testย tool.

To run a memory test:

    1. Download and install the Synology Assistant, where you can find the memory test function. The application is available atย Download Center.
    2. Open Synology Assistant, clickย and enable the memory test service.

    1. Select the device where you wish to run the test and clickย Memory Test.

During the memory test, your Synology NAS will be rebooted. It will recover after another reboot if its memory is normal and passes the test. However, if the memory test fails to finish or shows that there is an error, the memory may be faulty. In this case, you are strongly recommended to return your Synology NAS for repair. Just in case you have installed a non-Synology memory module, please remove it and rerun the memory test. Though once again you should remember that Synology do not recommend using memory modules that are not from Synology themselves, so this test may not be indicative of the health of unofficial memory in your Synology NAS. Alternatively,you can perform as many actions and processes as possible (scans, copy/pastes, thumbnail generation, transcode a 4K file, RAID changes, synchronisation, etc) at once to see how the task manager and resource monitor behaves in the Synology DS423+. It should spike each time and at a greater height as you do more and more and once it exceeds the memory you had previously installed, this is a good confirmation that the installation is working fine.


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2 thoughts on “Synology DS423+ compatible RAM upgrade

  1. DS224+ with Kingston KCP426SD8/16 (1 x 16GB, 2666 MHz, DDR4-RAM, SO-DIMM) works perfect. Ensure the RAM is sitting tight and correct in module holder by 2x clicks!

  2. Hi! I have tested two models of RAM on my new DS423+:

    Crucial RAM CT8G4SFRA266 8Go DDR4 2666MHz CL19 ( => KO, blue led always blinking…

    SABRENT RAM 8Go DDR4 3200MHz So-dimm ( OK no issue and RAM test form Synology Assistant OK

    => so 2GB + 8GB ๐Ÿ™‚

    Thank you for your article