What Is PCIe? A Basic Definition
PCIe x4: These have four PCIe lanes, and they also can fit into a x16 slot. Often used for single M.2 NVMe SSD expansion cards, they are also used for SATA 3 expansion cards and high-speed network adapters. ...
Expansion Slot in Computer - GeeksforGeeks
Expansion cards, also known as expansion boards or add-in cards, are circuit boards that are inserted into expansion slots on the motherboard of a computer.
Grundlagen PCI-Express - amdAREA51
Graphics cards are one of the most common devices you plug into PCIe slots. You can also add network cards, SSD expansion cards, sound cards, storage ...