Amazon.com: Apple iMac 24" with Retina 4.5K Display, M1 Chip with 8-Core CPU and 8-Core GPU, 16GB Memory, 256GB SSD, Gigabit Ethernet, Magic Keyboard with Touch ID and Numeric Keypad, Silver, Mid
Akitio Thunder3 10G network adapter adds 10 gigabit ethernet connection to MacBook Pro, iMac using Thunderbolt 3 | AppleInsider
Apple Now Offers $100 10Gb Ethernet Add-On for Mac Mini - MacRumors