PCIe

Definitions

1. Peripheral Component Interconnect Express — a high-speed serial expansion bus standard used to connect GPUs, NVMe SSDs, network cards, and other peripherals to a CPU. PCIe uses a lane-based architecture (x1, x4, x8, x16) where each lane is an independent full-duplex link; Gen 5 delivers roughly 64 GB/s at x16.

   In plain English: The high-speed connection inside your computer that links the processor to graphics cards, fast storage drives, and other add-on hardware.

   Example: "The new GPU needs a PCIe 4.0 x16 slot, and we're bottlenecked on bandwidth when training if we stick it in an x8 slot."

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