Sipeed’s boards are designed to fit right into slots on the NanoCluster, while you’ll need adapters to use Raspberry Pi Compute Modules. And while there are seven slots, you might not want to use them ...

Wo-we HU-MNPC05-L mini PC is a $45 mini PC with an older Intel Celeron N4020 dual-core Gemini Lake Refresh processor, 4GB RAM, 128GB flash.