New Raspberry Pi 4's have dedicated gigabit ethernet, two USB 3 ports, and up to 4GB of RAM. Read/write SSD speeds benchmarked over 320MB/s respectively. Gigabit ethernet reached 943Mbps. Impressive for networking
Raspberry Pi 4 Hardware Specs & Comparison • Pi Supply Maker Zone
Increasing Ram on your Raspberry Pi with ZRAM
How to set up an SSD with the Raspberry Pi 4 | The Pi Hut
Upgrading the Raspberry Pi 4 to 16GB of RAM
External graphics cards work on the Raspberry Pi | Jeff Geerling
Raspberry Pi CM4 2GB 4GB 8GB RAM Computer Module 4 Wifi eMMC Lite 8GB 16GB 32GB | eBay
Can You Add RAM to a Raspberry Pi? Find Out Here! – RaspberryTips
Dmitry Grinberg's ROMRAM Adds 8MB of External RAM to the Humble Raspberry Pi RP2040 - Hackster.io
Setup your Raspberry Pi 4 - without an external monitor - DEV Community
Raspberry Pi OS Rootfs ROMing - How to Add Packages While Making it a RAM Disk | Soracom
Raspberry Pi 4 With an SSD: Dramatic Speed Improvements, Higher Price | Tom's Hardware
External GPUs and the Raspberry Pi Compute Module 4 | Jeff Geerling
Raspberry Pi Compute Module 4 - 1GB RAM (CM4001000)
8GB of RAM on Raspberry Pi 4 & 64bit support - NotEnoughTech