Which of the following devices requires 3.3V of power from the motherboard?

The correct answer is D. Serial Port Card. PCI and PCIe expansion slots supply 3.3V and 12V to inserted cards. A serial port expansion card draws its operating power directly from the 3.3V rail of the PCI slot on the motherboard. USB ports supply 5V to connected peripheral devices. DVD-ROM drives use 5V and 12V provided…

Hardware

Question

Which of the following devices requires 3.3V of power from the motherboard?

Options

ASLI Video Card
BDVD-ROM Drive
CUSB Port
DSerial Port Card

How the community answered

(54 responses)

A
2% (1)
B
6% (3)
C
2% (1)
D
91% (49)

Explanation

PCI and PCIe expansion slots supply 3.3V and 12V to inserted cards. A serial port expansion card draws its operating power directly from the 3.3V rail of the PCI slot on the motherboard. USB ports supply 5V to connected peripheral devices. DVD-ROM drives use 5V and 12V provided via a Molex or SATA power connector. SLI video cards draw significant power from the 12V rail via PCIe power connectors. The 3.3V rail is specifically associated with low-power expansion cards like serial port cards.

Topics

#power requirements#3.3V#expansion cards#motherboard power

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