PCI Express - Wikipedia, the free encyclopedia

PCI Express - Wikipedia, the free encyclopedia: "Not to be confused with PCI-X.
PCI Express

Year created 2004
Created by Intel · Dell · IBM · HP
Supersedes AGP · PCI · PCI-X
Width in bits 1–32
Number of devices
One device each on each endpoint of each connection.

PCI Express switches can be used to create multiple endpoints out of one endpoint to allow sharing of one endpoint with multiple devices.
Capacity
Per lane (each direction):

v1.x: 250 MB/s (2 Gbit/s)
v2.x: 500 MB/s (4 Gbit/s)
v3.0: 1 GB/s (8 Gbit/s)
16 lane slot (each direction):

v1.x: 4 GB/s (32 Gbit/s)
v2.x: 8 GB/s (64 Gbit/s)
v3.0: 16 GB/s (128 Gbit/s)
Style Serial
Hotplugging interface Yes, if ExpressCard or PCI Express ExpressModule
External interface Yes, with PCI Express External Cabling such as Intel Thunderbolt.
PCI Express (Peripheral Component Interconnect Express), officially abbreviated as PCIe, is a computer expansion card standard designed to replace the older PCI, PCI-X, and AGP bus standards. PCIe has numerous improvements over the aforementioned bus standards, including higher maximum system bus throughput, lower I/O pin count and smaller physical footprint, better performance-scaling for bus devices, a more detailed error detection and reporting mechanism, and native hot plugging."