Mini PCI is a subset of the PCI interface that uses a significantly smaller card form factor. Supporting only 3.3 volts and 32 bits of the PCI specification, Mini PCI was designed for peripherals ...

After removing the VL805 QFN package and soldering in the bridge PCB, [Zak] confirmed that everything was hooked up properly and attempted to use the Raspberry Pi 4 with a PCIe extender.