expansion slots
motherboard pci slot types - duavang.net
Generally, PCI Express refers to the actual expansion slots on the that accept PCIe-based expansion cards and the types of expansion cards themselves.
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The benefit of slots is expansion allowing users to install expansion cards, adding features like sound, memory and network capabilities. Task 4 Look at these ...
Motherboard Ports: What They Are and How They Work - Lifewire
The purpose of expansion slots is to provide a standardized connection interface that allows expansion cards to communicate with the rest of the computer system.