One of them is [Jason Gin], who recently completed an epic quest to add a PCI Express (PCI-E) slot to his Atomic Pi ... between the PCB and a thin SATA cable that is mechanically secured to ...
Unfortunately it’s not quite as simple as just soldering on a four-wire USB cable. The modem relies on the 3.3V power from the Mini PCI-e slot instead of the 5V from USB. No problem ...