the race was on to be the first to connect a regular PCIe expansion card to a Raspberry Pi 4 SBC. Now [Zak Kemble] has created a new approach, using a bridge PCB that replaces the VL805 USB 3 ...
In contrast, PCI Express (PCIe) slots are sockets on the motherboard that expansion cards are inserted in. See expansion card and plugs and sockets. THIS DEFINITION IS FOR PERSONAL USE ONLY.