Term of the Moment
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Definition: PCI Express
The common hardware interface in PCs, Macs and other computers for connecting peripheral devices such as storage drives and graphics cards. PCI Express (PCIe) was introduced in 2002 as "Third Generation I/O" (3GIO), and by the mid-2000s, motherboards had at least one PCIe slot for graphics. PCIe superseded PCI and PCI-X.
Switched Architecture - Multiple Lanes
Unlike its PCI predecessor, which used a shared bus, PCI Express is a switched architecture of up to 32 independent, serial lanes (x1-x32) that transfer in parallel. Each lane is full duplex (see illustration below).
Internal and External for Laptops
A mini PCIe came out for laptops (see Mini PCI Express) and Thunderbolt extends PCIe outside the computer (see external GPU). For PCIe/PCI comparisons, see PCI-SIG. See PC data buses, PCI, M.2, ExpressCard, Thunderbolt and PCI-X.
Parallel Transfer of Serial Channels
PCIe on the Motherboard
M.2 Over PCIe
Different Sizes of PCI Express
PCIe Replaced AGP for Graphics
Switched Architecture - Multiple Lanes
Unlike its PCI predecessor, which used a shared bus, PCI Express is a switched architecture of up to 32 independent, serial lanes (x1-x32) that transfer in parallel. Each lane is full duplex (see illustration below).
Internal and External for Laptops
A mini PCIe came out for laptops (see Mini PCI Express) and Thunderbolt extends PCIe outside the computer (see external GPU). For PCIe/PCI comparisons, see PCI-SIG. See PC data buses, PCI, M.2, ExpressCard, Thunderbolt and PCI-X.
PCI Express Data Rate (each direction)
Version 1 Lane 4 Lanes 16 Lanes
(MBps) (GBps)
Gen 7 15130 60.52 242.08
Gen 6 7877 31.51 126.03
Gen 5 3938 15.75 63.02
Gen 4 1969 7.88 31.51
Gen 3 984 3.94 15.85
Gen 2 500 2 8
Gen 1 250 1 4
Each lane is an independent single-bit serial channel. PCIe is a type of parallel transfer but each lane has its own clock, which differentiates it from earlier parallel technologies.
This Asus motherboard has four x1 and three x16 slots (two black, one beige). The x16 slots accommodate x16, x8 and x4 cards. (Image courtesy of ASUStek Computer Inc.)
This is a 960GB NVMe SSD on an 80x20mm M.2 card. The connection is via PCIe, either via an M.2 socket on the motherboard or a PCIe adapter card. See M.2.
PCIe sockets are not the same as PCI, and they come in x1, x4, x8 and x16 sizes.
The AGP slot gave way to an x16 PCIe slot for the graphics card. (Image courtesy of NVIDIA Corporation.)