I bought a few of these for a project and have some unopened ones that I’ve never used. See the description below for board info. From my experience they work great with DietPi, Minimal Armbian, Radxa recommended Debian OS images, and even with LibreELEC and Kodi if you want a media server etc.

Experience high-performance computing with the RockPi Rock 4 Model C Plus, equipped with a powerful 64-Bit Quad Core ARM Cortex-A72 Processor. Ideal for a variety of applications, this device boasts a 1000BASE-T LAN standard, ensuring swift and efficient network connectivity. With 4GB of included storage, it's ready to handle your basic computing tasks with ease.

The RockPi Rock 4 Model C Plus features a compact design, measuring just 86.00mm in length and 11.00mm in height, making it perfect for portable use. It includes a GPIO 40pin external port for versatile add-on options. The unit comes with English language support and is ready to operate straight out of the box, simplifying your setup process.