Can I also use one in my computer?

TL;DR: Yes, you may use this card in your computer, but you will need to locate the correct driver. Long answer: Synology re-brands an OEM card, and you can search for those OEM drivers. The reason this card exists is so Synology can mark-up the price, as they only support their own brand in their NAS products. Some people are obsessed with protecting warranty compliance, particularly in the business world. So you would be better served finding another card. Good luck

Any alternative 10gb cards for ds1621+/ds1821+? because honestly those synology are priced way too high.

If you want both 10G network and M.2 slots, this E10M20-T from Synology with NOT work in the DS1817+ I am positive, and I suspect it would not work in the DS1621+ either....but if you go to synology website, it lists the compatible systems that it works in right there in the specs for the card. Unfortunately, I did not read that before hand...so I bought this for my DS1817+, but the m.2 slots don't work (the 10g port does though). If you want just 10g network ports...the X540-T2 works perfectly in my ds1817+ and ds1821+; you don't need the Intel version either. I have the 10Gtek version I bought here on Amazon and it works perfectly. No need to buy the Synology brand. https://www.amazon.com/dp/B01HMGWOU8?ref=ppx_yo2ov_dt_b_product_details&th=1

Does this work with my Synology DS418j?

It is not listed in the optional accessories section of DS418j in the product specs page. So I bet it will not work or it is not possible to attach one.

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Synology 10Gb Ethernet Adapter 1 RJ45 Port (E10G18-T1)

Product ID: 81030557

Details

Brand
Synology
Color
RJ-45
Compatible Devices
Desktop
Data Link Protocol
Ethernet
Data Transfer Rate
6
Hardware Interface
Ethernet

⚡10Gbps blazing speed

🔄Auto-negotiation multigig support

🛠️Plug & play OEM reliability

Description

🚀 Upgrade your NAS to lightning-fast 10GbE — because buffering is so last decade!

BLAZING 10 GBPS ETHERNET ⚡ - Experience ultra-fast data transfer that shatters bottlenecks and future-proofs your NAS setup.
COMPACT EFFICIENT DESIGN 📏 - Sleek, low-profile form factor fits perfectly in your desktop or NAS without clutter or heat issues.
EFFORTLESS OEM INTEGRATION 🛠️ - Synology’s official adapter ensures flawless DSM support and hassle-free installation—no guesswork needed.
SEAMLESS MULTIGIG COMPATIBILITY 🔄 - Effortlessly switch between 10G, 5G, 2.5G, 1G, and 100Mbps speeds for ultimate network flexibility.
5 YEAR WARRANTY PEACE OF MIND 🛡️ - Invest confidently with Synology’s industry-leading warranty backing your high-speed upgrade.

The Synology E10G18-T1 is a high-performance 10Gb Ethernet adapter with a single RJ-45 port, designed exclusively for select Synology NAS servers. Supporting IEEE 802.3an 10GBASE-T and backward-compatible multigig speeds (5G, 2.5G, 1G, 100Mbps), it delivers seamless, plug-and-play network acceleration. Compact and reliable, this OEM card ensures optimal DSM integration and comes with a 5-year warranty, making it the smart choice for professionals seeking to eliminate data bottlenecks and future-proof their home or small business network.

Specifications

ASIN	B07G9N9KJT
Best Sellers Rank	#266 in Powerline Network Adapters
Brand	Synology
Built-In Media	1 x E10G18-T1
Color	RJ-45
Compatible Devices	Desktop
Compatible Operating System Family	Linux
Customer Reviews	4.6 4.6 out of 5 stars (271)
Data Link Protocol	Ethernet
Data Transfer Rate	6 gigabits_per_second
External Testing Certification	Não aplicável
Global Trade Identification Number	00846504003105
Hardware Interface	Ethernet
Item Dimensions L x W x H	3.39"L x 2.68"W x 0.54"H
Item Type Name	Synology 10Gb Ethernet Adapter 1 RJ45 Port (E10G18-T1)
Item Weight	2.24 ounces
Manufacturer	Synology
Mfr Part Number	E10G18-T1
Model Number	E10G18-T1
Number of Items	1
UPC	846504003105
Unit Count	1 Count
Warranty Description	5 Years

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