Depending on what your idea of a computer is, the reference carrier board for the Raspberry Pi 4 compute module has a pcie x1 slot. The jetson family of develop

Depending on what your idea of a computer is, the reference carrier board for the Raspberry Pi 4 compute module has a pcie x1 slot. The jetson family of developer kits have pcie connectivity. The 4GB Jetson Nano has an m.2 E key slot which has a pcie x1 lane, with the right adapter available from Amazon or alibaba or where ever, you can plug in a pcie card of your choice. The Xavier NX has two m.2 slots, which again, with adapters can connect to pcie cards. Though I’m not sure of the use case as the jetson line has fairly capable gpus built in.