At just 44 grams, it's the second lightest adapter on this list ... a USB device that plugs into the USB port, or alternatively it can take the shape of PCIe - a Peripheral Component Interconnect ...

Overall Mini PCI-e is a fairly unloved interface, but we’ve seen the reverse of this hack before, a Mini PCI-e to USB adapter used to add a 12-axis sensor to a laptop.

This showed that the Raspberry Pi would happily talk with a VL805-based USB 3.0 PCIe expansion card, as well as a Realtek RTL8111-based Ethernet card, but not a number of other PCIe cards.