Most RPi style single-board computers (SBC) are passively cooled. Some perform better with a heatsink, some heatsinks come with a fan, but (for most use cases)

Most RPi style single-board computers (SBC) are passively cooled. Some perform better with a heatsink, some heatsinks come with a fan, but (for most use cases) it's not really needed. Passive cooling went away during the 80s/90s homecomputer -> PC transition. But modern tech has brought it back - provided you choose form factor & performance expectations appropriately (even though modern SBCs are crazy fast compared to Amiga or Atari ST era machines).