PCI Express, officially abbreviated as PCIe, is a high-speed standard used to connect hardware components inside computers. It is designed to replace older expansion bus standards such as PCI, PCI-X a
A PCIe 3.0 x8 host bus adapter
Various slots on a computer motherboard, from top to bottom: PCI Express x4 PCI Express x16 PCI Express x1 PCI Express x16 Conventional PCI (32-bit, 5 V)
PCI Express x1 card containing a PCI Express switch (covered by a small heat sink), which creates multiple endpoints out of one endpoint and lets multiple devices share it
The PCIe slots on a motherboard are often labeled with the number of PCIe lanes they have. Sometimes what may seem like a large slot may only have a few lanes. For instance, a x16 slot with only 4 PCIe lanes (bottom slot) is quite common.
Accelerated Graphics Port is an obsolete parallel expansion card standard, designed by Intel independently of the PCI-SIG for attaching a video card to a computer system to assist in the acceleration
PCI Express
…high-speed standard used to connect hardware components inside computers. It is designed to replace older expansion bus standards such as PCI, PCI-X and AGP. Developed and maintained by the PCI-SIG (PCI Special Interest Group), PCIe is commonly used to connect graphics cards, sound cards, Wi-Fi and Ethernet…
Universal AGP slot (brown, top), 2 PCI 2.2 slots (white beige, middle), and CNR slot (brown, bottom)
AGP graphics card (Apple Macintosh)