The ASUS Tinker Board is a compelling upgrade from a Raspberry Pi 3 B+ | Jeff Geerling
Amazon.com: Raspberry Pi 4, Pi 4 ARM-Cortex-A72 4X 1,50GHz, Raspberry Pi 4GB Board, WLAN-ac, Bluetooth 5, 4X USB, 2X Micro-HDMI, Raspberry Pi 4 Modell B 4GB RAM : Electronics
Raspberry Pi 4 GPIO Pinout
Raspberry Pi Model B upgrade released with extra RAM | Metro News
New Raspberry Pi Zero 2 Upgrades To Quad-Core Processor | Hackaday
How to Squeeze 50% More Memory Out of Your Raspberry Pi with zram