Synology only offers network card upgrades for certain NAS. I’ll show you how you can still enjoy a faster port using a USB LAN adapter.
Synology NAS Upgrade – 2.5 Gigabits with a USB LAN adapter - digitec
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Synology NAS Upgrade – 2.5 Gigabits with a USB LAN adapter - digitec
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Upgrade Your Synology NAS to 2.5 GbE
Synology NAS Upgrade – 2.5 Gigabits with a USB LAN adapter - digitec
【2.5Gb USB 3.0 Lan Adapter】 The USB A 3.0 to RJ-45 adapter supports 10/100/1000/2500 Mbps via a USB A 3.0 port. 2.5Gbps is 2.5x faster than 1000Mbps
USB 2.5Gb Ethernet Adapter, ULT-WIIQ USB 3.0 to 2.5 Gigabit RJ45 LAN Network Adapter Cable, 10/100/1000/2500M Full Speed NIC for Mac OS, iOS, Windows
Synology NAS Upgrade: 2,5 Gigabit mit USB-LAN-Adapter - Galaxus