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Extended holiday returns
FREE refund/replacement until Jan 31, 2027 Learn more
FREE refund/replacement until Jan 31, 2027 Learn more
This item's return window has been extended for the holiday season: FREE refund/replacement until Jan 31, 2027
To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
Availability:
Only 6 left in stock, order soon!
Arrives
Nov 17 – Nov 19
Recently Viewed
At a glance
- Condition
- New
- Style
- 4GB
- Model
- D4NESO-2666-4G
- Memory
- 4 GB
- Weight
- 0.02 kg
- RAM Memory Technology
- DDR4
- Memory Speed
- 2666 MT/s
- Warranty
- 5 Years
- Works with
- Server
Features 4
- DDR4 non-ECC unbuffered SO-DIMM
- Applied Models: RS820RP+, RS820+, DS2419+, DS1819+, DS1618+, DVA3219
- System ram type: ddr4_sdram
- Applied Models:20 series:RS820RP+, DS920+, DS720+, DS420+, DS220+,19 series:DS2419+, DS1819+,18 series:DS1618+
Description
Always select authentic Synology memory modules for optimum compatibility and reliability. Installation of non-Synology memory modules can lead to system instability or boot failures. Synology will not provide complete product warranty or technical support if non-Synology memory modules are used for memory expansion. For more information on memory upgrade limitations, visit Synology website.
Specs 23
| Brand | Synology |
|---|---|
| Computer Memory Size | 4 GB |
| RAM Memory Technology | DDR4 |
| Memory Speed | 2666 MT/s |
| Additional Features | Built and designed for maximum performance and reliability in Synology devices |
| Voltage | 1.2 volts |
| Column Address Strobe Latency | CL19 nanoseconds |
| Form Factor | SO-DIMM |
| Data Transfer Rate | 2666 MHz |
| Number of Pins | 260 |
| Memory Form Factor | SODIMM |
| Memory Generation | DDR4 |
| RAM Size | 4 GB |
| Model Name | D4NESO-2666-4G |
| UPC | 846504003662 |
| Number of Items | 1 |
| Manufacturer | Synology |
| Number of Packs | 1 |
| Unit Count | 1 Count |
| Global Trade Identification Number | 62, 69 |
| Item Weight | 0.02 kg |
| Model Number | D4NESO-2666-4G |
| Mfr Part Number | D4NESO-2666-4G |
No specs match.
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Nov 17 – Nov 19
Yes, absolutely! This item's return window has been extended for the holiday season: FREE refund/replacement until Jan 31, 2027.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Works flawlessly in my Synology DS 220+, it is a bit pricey
Style: 4GB
Size: D4NESO-2666-4G
Decided to go with the pricier memory from Synology because I decided the cost savings by choosing another memory chip brand wasn't worth it. I just want something that works perfectly.
Reviewed in the United States on March 3, 2023 by Tom E.
Works great but wish they didn't charge such a premium
Style: 4GB
Size: D4NESO-2666-4G
I'd ordered no-name memory first and it did not work. I returned it. Then I ordered this official memory upgrade and it did not work either! I contacted Synology support and they sent a replacement NAS DS220+. No problems installing this memory in that replacement. Love the boost in resources but wish that there was not such a significant price difference between this and the various no-name alternatives.
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Reviewed in the United States on June 6, 2023 by A Customer
Real Synology RAM
Style: 16GB
Size: D4ECSO-2666-16G
People leave negative reviews on here due to the price tag. I get it. You CAN buy cheaper RAM. However, doing so voids your Synology Warranty. They don't hide that. If you don't like the price of their RAM, then either don't buy a Synology or go into that purchase knowing you plan to void the warranty. Don't come leave a negative review because you don't like the price. The product arrived exactly as advertised: Real, legitimate (see photo) Synology RAM. Maybe the other reviewer purchased from someone else, I'm really not sure. Installation is a breeze. I put this into my new DS 1621+ by moving the original 4G Stick to Bank B and installing the new 16G Stick into Bank A. Booted right up without any issues and a cool 20G of RAM in the system now.
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Reviewed in the United States on February 12, 2021 by Michael Michael
Works as needed
Style: 4GB
Size: D4NESO-2666-4G
Purchased for business ... received on time and in good shape. No issues with purchase.
Reviewed in the United States on May 29, 2023 by Tammy
Expensive but works.
Style: 8GB
Size: D4ES02-8G
Works good but expensive.
Reviewed in the United States on May 31, 2023 by meak
Arguably overpriced, works as expected
Style: 16GB
Size: D4ECSO-2666-16G
There is a huge debate with Synology requiring in-house products in order to maintain the warranty (probably illegal) or customer support (not very ethical). It is not unusual behavior. DELL, IBM, and HP require in-house components in their servers too. This extends to many other industries as well. As consumers, we either put up with it or vote with our wallets to push for change. I installed this in a 1621xs+ NAS. There is no sugarcoating that this model NAS is on the border of requiring either Enterprise grade Synology or Enterprise grade through other vendors for every component. Either way, you are paying a premium for any upgrades. The installation is simple. Power down the NAS. Unplug the power and Ethernet cables. Ground yourself. Remove the two screws on the bottom plate to expose the RAM. Remove the old DIMM. Install the new DIMM. Reverse the previous steps. The NAS fired back up, now showing 32 GB or RAM. Ho hiccups. The only potential issue is if you mix DIMMS. The 1621xs+ white sheet specifically states to either have one DIMM or matched DIMMS. Double check your specs if you plan on mixing DIMMS. Depending on your workloads, you will either see better performance including lower queues for the processor or less usage of the CPU since you don't have to cache as much. Either way, your NAS will perform better. Is it worth it? If your workloads are keeping your CPU above 25% usage at rest, you need more RAM. If you don't like waiting for I/O requests, this will help. If you are a light user, this isn't necessary. Now for the debate. If you install non Synology RAM, you will receive warnings about warranty and support. It is on you to determine if you wish to ignore the warnings. It is also on you to determine the risks of causing instabilities on a NAS due to non supported RAM or other components. There are documented cases that some RAM can cause the NAS to reboot which can cause data loss. Uncontrolled reboots with NVMe cache or an expansion unit almost guarantees RAID failure. I do not like rebuilding RAIDs. Depending on the size of the RAID, it takes days to weeks. Unless you have a recent backup, there is a chance of extensive data loss. For those reasons, I paid for Synology. If you still wish to save money, the DIMMS look like Samsung RAM to me. Make sure you get ECC DDR4-2666.
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Reviewed in the United States on February 7, 2023 by Amazon Customer
high-quality memory
Style: 4GB
Size: D4NESO-2666-4G
The Synology RAM DDR4-2666 Non-ECC SO-DIMM 4GB (D4NESO-2666-4G) is a high-quality memory module that delivers solid performance. The installation process was straightforward and the module worked flawlessly in my Synology NAS.
Reviewed in the United States on February 20, 2023 by AP
Flawless and secures both warranty and support
Style: 4GB
Size: D4NESO-2666-4G
I already purchase one years ago for my DS220 and this one it's just as flawless. Will run non stop for years. In addition, you ensure that warranty and support is available since it's approved by Synology (of course)
Reviewed in the United States on October 29, 2022 by Fadi Augusto Khouri Hanna