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.
Types of expansion cards, slots, and their functions - Know Computing ...
Expansion Slots: These slots allow for additional expansion cards, such as graphics cards, sound cards, and network cards.
Box PCs with PCIe / PCI Expansion - BRESSNER Technology
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