NAS server · Upgrade RAM

Synology 2019 Configuration Guide Part 3: 16GB RAM specs and how to upgrade your Synology DS918+

In this blog post I will show you how to upgrade the RAM on your Synology and give you choices on which one to buy.

Disclaimer: Memory upgrade will most likely void the warranty. Also, installing a new RAM memory on the DS918+ is very easy but you can still cause damage to it, so you have been warned.

Before we get started, if you are still thinking about which synology to buy, check this guide instead: Synology 2019 Buying Guide, but if you are the happy owner of a new Synology, here is a guide on how to configure your brand new Synology!!

Here is the list of upcoming posts:

  1. Install DSM in your Synology (operating system)
  2. Configure your hard drives: Storage pool configuration
  3. Upgrade your Synology RAM -this post
  4. Part 4: Basic Security settings
  5. Part 5: Move/copy files between NASes


Do I need to upgrade?

If you are following my Synology Buying Guide for 2019 you know now that I have bought a new Synology for managing my YouTube files as well as drone and gopro files.

Working with media files, requires a lot of “juice” from your computer or server and the DS918+ comes with only 2GBx2 of RAM, which is not great for the intended use.

The great news about it, is that you can upgrade your memory and unless my other Synologies, this time they made those slots accessible (hurrahhh!!), so in this blog post I am going to show you how to upgrade and which memory I bought.

If you are unsure if you need to upgrade, start moving some files in your drives and do some work and check the performance. On the other hand, RAM memory is very cheap nowadays so I would upgrade either way, but if cash is an issue, wait a little bit.

You are probably dying to use your synology , but I recommend you to do this before you start configuring things, because you will see blazing speeds afterwards when transferring files. Pointless to do that after you have done all “heavy lifting” right?

Pick a RAM maker and capacity

First things first, which RAM maker and capacity should you pick?

Lets talk about makers first:

The vast majority of the RAM in the world is made by Samsung, SK Hynix (Hyundai Electronics), and Micron (Crucial). Nearly every other brand of memory (Corsair, G.Skill, Mushkin, Kingston, etc) isn’t a manufacturer. They just buy DRAM chips from one of these three manufacturers, install it on to PCBs, and sell it to you as “their” memory.

So in general, as long as you buy from a brand which has a lifetime warranty, pretty much any memory is OK since they’re all using the same components. If you want “direct from the manufacturer” memory, Micron/Crucial is the easiest. They have their own retail branch, support, and memory finder tool. (Source)

Now, how much RAM should I buy?

This is an easy one: As much as you can afford and your system supports. For a Synology DS918+ the max memory is 16GB so I bought:

**Disclaimer, the link below is an affiliate link, which means, I will get a few dollars if you buy from it. Thanks in advance!

Crucial 8GB Single DDR3 1866 MT/s (PC3-14900) 204-Pin SODIMM RAM Upgrade for iMac (Retina 5K, 27-inch, Late 2015) – CT8G3S186DM

How to install your new memory in your NAS

Now that you bought your memory, turn off your NAS and disconnect it from everything.


Pull all the hard drives out,

Remove disks to add ram to your synology

And to your right, you will see the RAM.

To get the RAM out, you need to pull the “arms” holding the card OUT and the RAM will “pop out”:

RAM inside the synology ds918+

Pull the RAM memory card out and proceed to install the new one.

To do that, you need to:

  1. Make sure that you align the card correctly
  2. Push and wiggle the card into the slot
  3. and finally, you need to push down the card until the “arms” snap back and hold the card. You should hear a “click”

Push the RAM card into the slot synology

And the same with the other one and you are done!!


And you have now installed 16gb ram in your synology

Put back the drives, connect everything, start your synology and cross your fingers…

If everything went well, you should see the new memory on the Info Center in the Control Panel:


My NAS is now blazing fast!! …

…and I have done this to all NASes I own.

35 thoughts on “Synology 2019 Configuration Guide Part 3: 16GB RAM specs and how to upgrade your Synology DS918+

  1. You’ve installed 1600 MT/s RAM – the NAS came with 1866 MT/s RAM – so should you not have used similar speed RAM?


      1. Your photo of the Crucial box suggest that it’s DDR3-1600, DDR3-1866 would have the product code CT2K102464BF186D


  2. But that’s not what you installed in the NAS, you installed DDR3-1600, not DDR3-1866 – I’m interested to know which one works – maybe they both work?


      1. I ended up getting the Kingston HyperX HX318LS11IBK2/16 – it was slightly cheaper and has a CL11 vs CL13 for the Crucial.


  3. Hi,
    I tried to install the Crucial CT8G3S186DM module in my DS918+ (DSM 6.2.2-24922 Update 2); it fails to boot, simply sits there with the power LED flashing.

    I tried the original 4GB module + 1 8GB module, same thing.

    Is there any indication Synology have updated DSM to check for “genuine” modules only?



  4. Ruth,
    You may want to do some more research on the 16GB thing. The Intel Chip J3455 does not support more than 8GB. If you look directly on Intel’s website (, they clearly show that. I’ve read on some forums/blogs some comments that Synology is capable of reading the total amount of memory, but not using the total amount of memory. And their statistics will base usage off of installed memory, not usable memory – so it is misleading. Curious if anyone has compared 8GB to 16GB and seen actual differences. Not taking a dig at you (appreciate all your wonderful information) but don’t want users to be mislead and purchase more RAM than can truly be used.


  5. Ok, cool. If anyone else reading this has upgraded from 8GB to 16 GB, I’d love to hear your experience. If it can truly leverage the full 16GB, I’d consider upgrading my current 8GB configuration. There seems to be conflicting information out there on the webs. Would love to hear from anyone’s personal experience.


      1. Hey, it’s me – the crazy 16GB vs. 8GB guy. 🙂 I just had a thought – if anyone is willing to try this, perhaps we could do a REVERSE test. What if someone running 16GB of memory (2 x 8GB) tried to remove one stick and then boot the Synology up again. They could do a test to see if they see any significant performance degradations. Then, pop the 8GB stick back in and see if you see drastic improvements. Maybe people don’t want to do this type of test on their actual Synology box, but perhaps they have one that they’d be willing to test?


  6. I read too many reports from folks who put in 16 GB and got all sorts of problematic behavior so I will go for the 2 x 4GB for now. That one would experience a performance boost after inserting a second module is not surprising, dual channel utilization would explain that. Whether you have 8 or 16 GB should not make a difference for any application but running several virtual machines at the same time.

    The case for 16 GB would be more convincing if someone actually maxed out the memory utilization (as shown by the resource monitor) and still reported a stable system. Links, anyone?


  7. I just bought a ds918 + and with 2 crucial memory modules CT8G3S186DM in 1 week has restarted 2 times, the restart causes the disk volume check.

    After reading many forums I don’t know what the problem is. There are many users that work well with the modules (16 Gb) and have no problems and others like me have had this problem.

    My system also has 2 SSD disks installed for cache in read / write mode.

    I am thinking of trying another 2 Kingston brand modules reference HX318LS11IBK2/16

    Ruth, ¿tienes una configuración con 2 discos SSD instalados?


  8. If it helps anyone, I tried 2 new CT8G3S186DM modules in a new ds918+ based on what I read here and elsewhere, and it didn’t work for me, I just got the flashing blue light. I then remembered i had a couple of modules in an old mac-mini, thought I’d try those…. and it worked!!!

    So, the modules that worked for me are 2 x Hynix HMT41GS6BFR8A-PB 8GB 2Rx8 PC3l-12800S-11-13-F3 . I’m assuming the Synology unit preferred the slightly slower speed memory sticks – even though the original one in there was 1866Mhz.


  9. Has anyone successfully installed 16gb of DDR4 ram? Intel specs show its DDR4 compatible up to 2400MT/s


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