What Are PCIe X4 Slots Used For?

PCIe slots are typically used to install additional graphics/system cards, storage devices, and other expansion cards. PCIe slots are also used to install other types of PCI-Express connectors, such as M.2, SATA Express, and USB 3.1 Gen2.

Some motherboards use multiple PCIe slots to support multiple graphics cards or multiple M.2 slots for fast storage.

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