What Synology NAS to Buy? 5 Steps to Pick the Right Model

  • Post author:WunderTech
  • Post published:May 21, 2024
  • Post last modified:May 21, 2024
  • Post category:Synology
  • Reading time:27 mins read

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I’ve tested various network-attached storage (NAS) devices from many manufacturers, NAS operating systems, and if you’ve followed me for any length of time, you’ll know that I always fall back to Synology as the best overall brand.

From an investment perspective, as well as a feature and functionality perspective, Synology models are generally the best overall devices, with new releases coming regularly, all running on a rock-solid operating system.

Disclosure: Some links below are Amazon affiliate links which means that I earn a percentage of each sale at no cost to you. Thank you for your support.

What Synology NAS to Buy?

Overall, all Synology NAS models are similar because they run the same NAS operating system (DiskStation Manager – DSM), but there are some major differences that I’ve observed and those differences are what will point you in the right direction. Whether you want hardware transcoding, upgraded networking, or just the most stable overall option, we’ll break down all of the important items below to help you select the best option.

Disclaimer: There are other Synology NAS models, but quite frankly, I don’t think you should waste your money on them so I’m going to be focusing on models that make the most sense for a broad audience.

Step 1: Selecting the Correct Model of Synology NAS

Synology makes four models of devices: J-series, non-plus models, plus models, and xs+ models. Almost all users should purchase a “plus” series device, though there are some recent J-series models that have an incredible value.

Synology Models
J-Series (low performanace, budget option)
Non-Plus (decent performance, budget option)
Plus(+) (good performance, upgrades available, non-budget option)
xs+ (best overall performance, upgrades come standard, terrible overall value)

The benefit of a plus model is you will have the best overall performance to value. Synology sells xs+ models as well which provide the best overall performance, but they are going to be overkill for almost everyone and require specific things like enterprise-grade hard drives to function properly. They’re also a horrendous value.

Synology’s plus models all support the Btrfs filesystem which opens you up to snapshots and data scrubbing, and is the sweet spot for almost everyone.

Step 2: Selecting the Correct CPU

All Synology models of the past generally came with Intel processors which supported Intel QuickSync, and could be used as media servers with hardware transcoding. That is no longer the case, as Synology switched to Ryzen processors around 2021 which do not support hardware transcoding (there’s no integrated graphics).

ryzen processor. what synology nas to buy?

This is a wildly misunderstood topic so I need to break down why this is a good thing. Synology devices now support error-correcting memory (ECC). All Synology models of the past with Intel processors have non-ECC memory, which means that errors can be written to disk. With ECC memory, if an error is detected, it’s corrected before being written to disk.

THIS IS AMAZING FOR NAS DEVICES. I cannot understate that. You WANT ECC Memory for data integrity, so while you won’t have the ability to hardware transcode, you will have higher data integrity…which is the point of a NAS, right? The models I suggest are all devices that support ECC memory, but if you really want to use hardware transcoding, look at these models that support hardware transcoding and are great for use as media servers.

Step 3: Selecting the Correct Number of Drive Bays

Synology NAS devices come with drive bays ranging from 2 bays to 12 bays. This will impact the RAID Type you can use, as well as the ability for data and RAID scrubbing to work properly (if that’s important for you), and will ultimately determine how much total storage space you can use on the device. Let me break this down extremely simply for you: you should buy a device with a higher total number of drive bays than you think you’ll need if you can afford it.

The most popular Synology NAS devices are their two-bay models, followed by their four-bay models. As the drive bays go up, they get less and less popular. Remember, they all run the DSM operating system, but this is the biggest mistake that potential Synology buyers make as they underestimate their storage requirements, and then are forced to either upgrade or buy an expansion unit (which in my opinion, is a waste of money).

To help determine which option is best for you, compare RAID types and storage requirements by using Synology’s RAID Calculator and if possible, buy one model higher (if you think you’ll need four bays, go with a five-bay unit).

synology raid calculator to determine raid types

Step 4: Selecting the Correct Upgrades (Networking, RAM, SSD Cache)

Certain Synology NAS devices can be upgraded, either with upgraded networking capabilities (10GbE), removable memory to increase the RAM total, and NVMe SSD slots for SSD caching or NVMe Volumes. Not all devices can be upgraded, but I’d suggest you look at the upgrades and determine if they’re something that’s important to you.

To be clear, all Synology NAS devices come standard with a core set of hardware but are potentially missing a few important upgrades.

Upgrade: 10GbE Networking Equipment

10GbE will increase the network throughput ten times versus the standard 1GbE interfaces that come on almost all Synology models (1250 MB/s transfer speeds with 10Gb as opposed to 125 MB/s with 1Gb). If you’re interested in increasing the network performance to 10GbE, you’ll have to purchase an E10G22-T1-Mini (for the Synology DS923+ and DS1522+), or an E10G18-T1 PCIe device for the Synology DS1621+ or DS1821+.


Keep in mind that you’ll need to increase your core networking to 10GbE as well, but this is a great way to improve the network transfer speeds of your new Synology NAS.

10GbE setup on a synology nas
10GbE Setup in Synology DSM 7.2

Upgrade: NVMe SSD Cache Drives

Another great option is to purchase NVMe SSD drives for SSD caching. If you’re interested in increasing the network transfer speeds (without being able to maximize the throughput with hard drives alone), you can look into using read/write SSD cache in RAID 1.

Not only can this increase the performance of network transfers, but you can and will get better performance for operations local to the NAS (like virtual machines).

ssd cache on a ds923+
NVMe SSD Cache on a DS923+

The SNV3400-400G is a Synology NVMe Drive designed for SSD caching in Synology NAS devices, but you can use any NVMe SSD Cache drive you’d like.

Upgrade: Increase Memory (RAM)

The memory totals listed above are what comes standard on each Synology NAS device. However, you can always increase the RAM on a Synology NAS if you’d like.

upgraded RAM on a DS923+
Upgraded Memory on a Synology DS923+

These links are for the standard, Synology-offered Memory upgrade kits. If you’d like to use unofficial memory, you can, but compatibility is not guaranteed by Synology.

Synology DS923+4GB D4ES02-4G
Synology DS224+ / DS423+4GB D4NESO-2666-4G
Synology DS1621+ / DS1821+ / DS1621xs+8GB D4ES01-8G
synology memory

Which Synology NAS Should You Buy?

Now that we looked at basically all of the key differences, I want to break down some of the most common options that you should consider, based on different categories.

Best Overall Synology NAS

Synology DS923+


What Synology NAS to Buy? 5 Steps to Pick the Right Model
The best overall Synology NAS is the Synology DS923+. It’s a great starter NAS, can be upgraded with more memory, 10GbE, and NVMe SSDs for caching or volumes. Overall, you can’t go wrong with this device as your first NAS and it’s where everyone should start.
Features (PCIe Expansion, SSD Caching, Upgradable Memory)
Networking Support


The Synology DS923+ is a four-bay NAS with an AMD Ryzen processor and 4GB of DDR4 ECC memory. Simply put, it’s the best Synology NAS for almost everyone. What I like the most about this NAS is it’s upgradeable. Everything from the memory to the networking (10Gbe), as well as NVMe drives which can be used for SSD caching or volumes.

Four drive-bays will be more than enough for most users.Cannot use hardware transcoding for media servers.
Upgradable RAM, networking, NVMeMust purchase the Synology 10GbE network adapter.
Supports Btrfs
Purchase the E10G22-T1-Mini for 10GbE, 4GB of Memory if you’d like to upgrade, and NVMe Caching Drives for SSD Cache.

This is the Synology NAS that almost everyone should buy, It’s future-proof, has great performance, great upgrades, and is an awesome device.

Best Synology NAS Budget Option

Synology DS223j


What Synology NAS to Buy? 5 Steps to Pick the Right Model
The Synology DS223j is a great overall budget option that’s underpowered. I don’t love it and I’d say the majority of people shouldn’t buy it, but if you want to run DSM, need two bays, and don’t want to use it for anything other than a NAS (no Docker, applications, etc), it’s great.
Features (PCIe Expansion, SSD Caching, Upgradable Memory)
Networking Support


I never recommended J-series Synology devices as they didn’t support BTRFS, though the Synology DS223j is an exception. The DS223j now supports BTRFS and is an overall great option for users looking to break into owning a Synology NAS and learning about Synology DSM and might be the best Synology NAS if that’s your goal.

Incredible price for a 2-bay NAS device.Underpowered CPU, and only 1GB of non-upgradeable memory.
Supports Btrfs1 RJ-45 network port (as opposed to the two that normally come standard)
Overall, underpowered device and should really only be used as a budget NAS.

Ultimately, purchase this device if you want the get a Synology NAS and use it for limited file storage purposes while keeping budget in mind. If you want a two-bay NAS that’s a little more powerful, I’d recommend looking at the DS224+ below.

Best Synology NAS for Beginners

Synology DS224+


What Synology NAS to Buy? 5 Steps to Pick the Right Model
The Synology DS224+ is the best NAS you can get started with. It’s a better overall device than the DS223j above and I think that it’s a better two-bay option overall. The downside is that from a value perspective, it’s not as great, but the DS223j is an extremely underpowered device and this isn’t. Plus, it supports hardware transcoding!
Features (PCIe Expansion, SSD Caching, Upgradable Memory)
Networking Support


The Synology DS224+ is a great Synology NAS for beginners and home users. For the most part, you’ll be able to do everything you need with this device, assuming that two bays are enough. It comes with an Intel-based processor which can be used for hardware transcoding, making this a great option for Plex, and boosts good overall performance.

Intel J4125 Processor can be used for hardware transcoding.Non-upgradable networking, NVMe
Supports BtrfsLimited to two drive bays (no expansion options)
Upgradeable memory, but only a maximum of 6GB of RAM.

This is going to be a great device for beginners as you can learn all about the Synology DSM operating system, but if you’re looking for expansion options or upgradability, this device isn’t going to be a good fit and that’s why I think it’s not a great option for most. Here are a few additional notes about the DS224+:

  • If you truly think that you won’t need more than two bays, the DS224+ is a great option, but look at the Synology DS723+ if you want expandability and the ability to upgrade to 32GB of RAM.
  • For redundancy, you’re stuck with RAID 1. If you’re purchasing the DS723+, you can buy an expansion unit (though again, just buy the DS923+ above if you need more bays).

Best Synology NAS for Power Users

Synology DS1621+


What Synology NAS to Buy? 5 Steps to Pick the Right Model
As of right now, the DS1621+ is the best option for power users. It has awesome PCIe expansion options, has a better processor than the options above, has an integrated PSU, can be upgraded to 32GB of memory, and is overall, the best option for power users. Not the best value, though.
Features (PCIe Expansion, SSD Caching, Upgradable Memory)
Networking Support


This is the device where Synology models “change”. Up to this point, they’re all relatively the same outside of minior key differences, but this is drastically different from a quality perspective. Better components in every single way, but you’re going to pay for it.

Six drive-bays are going to be enough for almost everyone.Cannot use hardware transcoding for media servers.
Upgradable RAM, networking, NVMeMust purchase the Synology 10GbE network adapter.
Supports BTRFSOverkill for most users.

The Synology DS1621+ is the most premium NAS you can get, though it’s going to be overkill for most home users. Here are a few additional important points:

  • If you’re looking for more drive bays, the Synology DS1821+ is the exact same thing as the DS1621+ (same processor, memory, etc), but it has two additional drive bays.
  • If you want to upgrade the memory, purchase 8GB D4ES01-8G.
  • If you’d like to use NVMe cache or volumes, purchase the SNV3400-400G.

Most Powerful Synology NAS Device

Synology DS1621xs+


which synology nas buy
This device is overkill for almost everyone, requires Synology hard drives, and is a terrible value. The DS1621+ can be upgraded to practically clone this device outside of the hardware for a cheaper overall price, but it won’t have as good of a CPU. If you must have the best Synology device that’s not a rack-mounted option, this is it.
Features (PCIe Expansion, SSD Caching, Upgradable Memory)
Networking Support


This is the most powerful consumer/prosumer NAS you can purchase in desktop form, though not necessarily the best for all users. The biggest draw is 10GbE support out of the box, but this can be added to either the DS1621+ or DS1821+ models for a reasonable price. Overall, most people shoudn’t buy this device, but if you’re one of those few people who need one, look at the DS1823xs+ as well which is an even worse value, but even “better”.


Final Takeaway

All Synology NAS, consumer-grade devices are relatively similar. They’re all going to run DSM 7, offer a baseline level of support, and function similarly. I always fall back to determining what upgrades you’ll need to help decide which option is best. If you don’t look at it that way, you’re going to end up buying a device that you don’t really understand and when you want to upgrade something, it’s going to be a lot harder. Finally, make sure you configure it properly which after buying, is the most important part.