A high-speed hardware interface from Intel for connecting peripheral devices. PCI Express (PCIe) was introduced in 2002, and by the mid-2000s, motherboards had at least one PCIe slot for the graphics card. PCIe is also used for hard drives, SSDs, Wi-Fi and Ethernet. Introduced in 2002 as "Third Generation I/O" (3GIO), PCIe superseded both PCI and PCI-X.Switched Architecture - Multiple Lanes
Rather than the shared bus of PCI, PCIe provides a switched architecture of up to 32 independent, serial "lanes" that can transfer in parallel, designated 1x to 32x. The switch backplane determines the total bandwidth, and cards and motherboards are compatible between versions.Internal and External for Laptops
A mini version of PCIe was developed for laptops (see Mini PCI Express
) and ExpressCard and Thunderbolt interfaces extend PCIe outside the computer (see external GPU
). For PCIe/PCI comparisons, see PCI-SIG
. See PCI
. Data TransferPCI Express (Bytes/Sec)Version 1 Lane 16 Lanes
1.0 250 MBps 4 GBps 2.0 500 MBps 8 GBps 3.0 1 GBps** 16 GBps** 4.0 2 GBps** 32 GBps** ** = rounded.