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Laptops are still pretty bulky and power hungry in comparison if you're looking for very SFF and passive cooling.

You can passively cool a laptop CPU too if that's your jam. Plus, latest RPI 5 cases now feature fans to not thermal throttle :))

Pop open a cheap Celeron N laptop, and often, the motherboard inside is essentially a passively cooled SBC.

The big pain with using something like this would mostly be the IO and odd form factor.