All terms
Hardware & Systems
PCIe
The standard bus connecting GPUs, accelerators, and storage to a host CPU.
Definition
PCIe (Peripheral Component Interconnect Express) is the standard high-speed bus that connects accelerators, storage, and other devices to a host system's CPU. In AI servers it carries data between the CPU and GPUs, and its bandwidth can become a bottleneck when large amounts of data must move on and off the accelerators. Newer generations roughly double bandwidth, and faster GPU-to-GPU links like NVLink exist alongside it.