Discussion
What is the function of an expansion slot on a motherboard?
Answer: C
Correct answer: To allow additional cards to be fitted, extending the computer’s capabilities
An expansion slot accepts a circuit card that adds capability the motherboard does not itself provide - a graphics card, sound card, network card, capture card or additional storage controller. The modern standard is PCI Express, which comes in sizes described by the number of lanes: x1, x4, x8 and x16. Each lane is a serial connection, so bandwidth scales with the count, and a graphics card takes an x16 slot. A shorter card fits a longer slot and simply uses fewer lanes. It replaced the older PCI and AGP standards, and the shift from parallel PCI to serial PCI Express follows the same reasoning as USB and SATA: at high speeds, timing skew between parallel wires becomes the limiting factor. The other options describe different parts: the processor sits in a socket, the power supply uses dedicated connectors, and BIOS settings live in CMOS memory kept alive by a battery.
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