Testing 2.5 Gbps Ethernet on the Raspberry Pi CM4 | Jeff Geerling
PCE-C2500|Wired Networking|ASUS Global
Amazon.com: QNAP QXG-10G2TB Two Port 10GbE Network Card Supporting up to Five speeds (10GbE / 5GbE / 2.5GbE / 1GbE / 100MbE), and maximizes Your NAS and PC Network connectivity : Electronics
Syba 2.5 Gigabit Ethernet PCIe NIC Review - ServeTheHome
Pcie X1 Rtl8125b Server Network Card 2.5gbe Multi Gigabit Network Card Pcie Gigabit Ethernet Adapter - Network Cards - AliExpress