Synology DS920+ NAS – Taking it to Pieces

Synology DS920+ NAS Hardware Tear Down

For those of you that are interested in the newest generation of Synology NAS, you are probably wondering about what exactly goes on under the bonnet. We talk about the CPU and Memory plenty, but what about on the inside? Where does the Synology DSM software get extracted from? Where is the other memory bay? How is the CPU kept cool? There are interesting (if slightly nerdy) questions. Luckily I have a space DS920+ NAS here and I am an interesting (if slightly nerdy) guy who wants to find out. So, let’s take the Synology DS920+ NAS apart and find out what is inside that small black chassis. Alternatively, if you are looking for the DS920+ NAS Review, please find my DS920+ Hardware Review HERE. Now, I’ll go get my screwdriver.

Disclaimer – Please, Please, PLEASE do not try this yourself. I am doing this so you do not have to! I mainly started this to find out how Synology had locked the device to 6GB maximum memory. Do not do this unless you have the technical knowledge to know what you are doing OR are ok with invalidating your warranty. Also, BACKUP YOUR DATA!

Taking the Synology DS920+ NAS a part

First things first, I made sure to safely power down the DS920+ NAS, then remove the PSU and LAN connection. Then I removed the HDD media from inside.

Once I removed the HDD media and trays I made sure that the SODIMM memory module was empty.

Then I rotated the device in order to gain access to the rear 3x screw that hold the device casing together. First is the top left corner.

Then remove the lower screw on the same side.

Then I removed the screw located next to the USB 3.0 Port, as this secures the connector internally to the chassis

After removing these screws, the larger half of the external chassis will slide away.

Once the larger part of the framework is gone, you will see the main SATA HDD frame.

Next you need to unscrew each of the fans from the internal framework. Each is secured with a single screw.

You will need to remove each to make sure the fans are not damaged in the movement of the internal framework.

Next, you will need to insecure the main internal framework that holds the SATA media cage and its connection to the main base metal panel. These is formed for 8 screws (4 on each side)


There are two groups of different screw types on each side

Removing these 8 screws will loosen the physical connection with the rear of the chassis and allow you to access the two screws that are just behind the fan modules, that keep the USB internal connector attached.

From there you can remove the two white power connectors for each fan, which should allow you to remove the internal frame cage and main PCBs from the 2nd half of the DS920+ chassis.

Next, we need to remove the NVMe SSD board that is attached by 3 screws to the SATA frame cage. Removing these screws will allow you to lift out the NVMe PCB. Be fore to be careful whilst doing this!

Once you remove these screws, it will reveal a single extra screw located under the NVMe SSD PCB. Remove this screw, and then the whole SATA cage should lift from the main board.

This will allow you to remove the main cage and you are left with the main controller board with its metal panel on the top.

The metal panel is held against the internal controller board by 4 screws at each corner and is easily removed, exposing the mainboard.

Once you remove these four screws, you have the main controller board exposed, along with all its key components. Again, BE CAREFUL!

The large black heatsink in the centre is where the Intel J4125 CPU is kept, and this heatsink is several times its size.

To the right of the CPU is the small piece of flash ROM memory that keeps the DSM software that is shipped with the device at launch.

Flipping the board over (carefully) shows us the side that many users are the most interested in. The board has the SODIMM DDR4 Memory slow for adding a 4GB Synology DDR4 2666MHz RAM module.

However the memory module is indeed the ONLY available upgrade slot inside and those that hoped to find a 2nd slot inside (which included me too, will recently) are met with a collection of soldered memory chips in the main board inside. These make up the 4GB of DDR4 memory that the device ships with.

These 4 cells are memory models and K4A4G165WE-BCTD in model ID. That is Samsung memory, more information here As well as a bank of information on the Samsung datasheets HERE.

And there you have it. That is the inside of the Synology DS920+ NAS Drive. Once again, I do not recommend you do this yourself, but I do hope that you found it useful. If so, why not let me know in the comments. Otherwise, thank you for reading.

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    27 thoughts on “Synology DS920+ NAS – Taking it to Pieces

    1. I am going through all the videos learning about NAS, particularly from Synology before I dip my toes to get one (preferably the DS920+) to replace an ageing Drobo 4 bay. I am getting more confident by the day and by the videos. watched. Thank you for the great videos.

    2. Recently bought this as my first NAS.. Attached a Seagate Exos 16TB, configured as SHR.. Later will expand with other bays. The only negative I can call out is that it came with a 16 amp plug which is very difficult to attach to a socket used for low power devices.. only refrigerators, water heaters etc need that. So I replaced the cable with a 10 amp one and its working fine

    3. I can’t believe I watched 50 minutes of this. Very very informative. I’m a new nas user and this 920+ is my first nas so thank you for the overview!! I didn’t know it could do much more than I already thought it could!

    4. bought this exact NAS on prime day sale today. $473 USD, 16GB crucial 2666 memory upgrade $82 (20GB ram total), 2x noctua nf-a9 fans to get rid of the stock synology loud fans $34, 2x250GB western digital blue nvme for caching. Reusing 4x8TB ironwolf drives. it’s main purpose for me is going to be 4k uncompressed plex server

    5. I know it’s an old post, but all that pretty packaging you’re so impressed by you’re paying for. Protective packaging is a must, but why does is have to be so impressive? A measly dollar/quid increases drastically by the time it gets to the consumer. Simply put, in business, if you spend money you have to make money .
      Other than that a fair video.

    6. Can you please check the memory chips soldered to the DS920+? It should be different from the ones you showed in the tear down of DS220+, because both boards have 4 memory chips, the DS220+ has 2GB, and DS920+ should have 4GB. The Samsung K4A4G165WE-BCTD is 4Gb density, so 4 of those should be 16Gb = 2GB. The DS920+ should have 8Gb density memory chips.

      I have yet to make sense of the RAM situation of the DS220+/720+/920+ series. The datasheet of the Intel Celeron J4105/4005 shows that the two memory channels can independently have either single or dual rank configurations, and supports 4, 8, and 16Gb densities. It does state that maximum total system capacity is 8GB, but the memory controller supports dual rank (1Gbx8)x(8×2) such as the Samsung M471A2K43CB1-CPB 16GB SO-DIMM. The Crucial 32GB SO-DIMM CT32G4SFD8266 doesn’t have detailed datasheet, but if it is single rank, then I think the configuration is (4Gbx8)x(8) but each chip’s 32Gb density is too high and not supported. In any case, my understanding is that the CPU can only map and utilize 8GB of memory, and the portion beyond that may never be accessed. I hope to see more definitive evidence that there is performance gains between having 8GB and more than 8GB.

      side note: the J4125/4025 are probably the same SoC as the J4105/4005 but “refreshed” to optimize clock frequencies. The previous generation J3355/3455 SoC has a different memory controller that supported DDR3 and DDR4.