Pop open a cheap Celeron N laptop, and often, the motherboard inside is essentially a passively cooled SBC. https://www.insidemylaptop.com/wp-content/uploads/2

Pop open a cheap Celeron N laptop, and often, the motherboard inside is essentially a passively cooled SBC. https://www.insidemylaptop.com/wp-content/uploads/2018/03/Lenovo-Ideapad-110-16.jpg https://www.insidemylaptop.com/wp-content/uploads/2018/03/Le... The big pain with using something like this would mostly be the IO and odd form factor.