What are PCIe slots used for?

• A. Slots for power connectors.
• B. Peripheral device housings.
• C. High-speed expansion interfaces for NICs, HBAs, RAID cards, GPUs, and accelerators.
• D. RAM expansion ports.

Answer: (C)

PCIe slots are the high-speed expansion interfaces on a motherboard that let you add cards to boost system capabilities. They’re a serial, point‑to‑point connection that carries data between the CPU/memory and a variety of expansion cards. You’ll see them used for NICs to add or upgrade network connectivity, HBAs for storage networks, RAID controllers for storage management, GPUs for graphics or compute tasks, and accelerator cards for tasks like AI or video processing. The slot width (how many lanes) and the PCIe generation determine the available bandwidth, which is why more demanding devices use wider or newer slots. Power connectors from the PSU are separate, RAM sits in its own memory slots, and PCIe is specifically about adding high-speed expansion cards.