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Difficulty: MediumMotherboards Form Factors and Connectors

A field technician is assembling a high-performance desktop workstation and reviewing the motherboard power connections prior to cable management. Which TWO of the following statements correctly describe standard motherboard power connectors and their operational roles?

  1. The main 24-pin ATX power connector supplies the primary voltage rails (+3.3V, +5V, and +12V) directly to the motherboard chipset and onboard buses.Answer
  2. The 8-pin EPS12V connector provides dedicated +12V power specifically to the CPU voltage regulator modules on the motherboard.Answer
  3. C
    An 8-pin PCIe auxiliary power cable from the power supply can be plugged into the 8-pin EPS12V motherboard socket interchangeably because they share identical pinouts.
  4. D
    The 24-pin ATX connector powers expansion slots exclusively, while all motherboard integrated circuitry relies on dedicated SATA power cables connected directly to headers.

Answer

The two correct statements are: (1) The main 24-pin ATX power connector supplies the primary voltage rails (+3.3V, +5V, and +12V) directly to the motherboard chipset and onboard buses; and (2) The 8-pin EPS12V connector provides dedicated +12V power specifically to the CPU voltage regulator modules on the motherboard.
The 24-pin ATX connector delivers multi-voltage power (+3.3V, +5V, +12V) to the motherboard logic and expansion slots, while the 8-pin EPS12V connector delivers supplementary +12V power directly to the CPU power regulation system. Both of these statements correctly describe motherboard power standards.

Step-by-Step Solution

1
Identify the role of the primary P1 motherboard power connector.
The main 24-pin ATX power connector supplies multi-rail power (+3.3V, +5V, and +12V) across the motherboard PCB.
Motherboards require different DC voltages for chipset logic, PCIe slot power, and auxiliary circuits.
2
Identify the role of auxiliary CPU power connectors.
The 8-pin EPS12V connector supplies dedicated +12V power to the processor power phases.
Modern CPUs draw significant current that cannot be supplied solely through the primary 24-pin ATX connector.
3
Evaluate and discard distractor options regarding connector keying and pinouts.
Differentiate EPS12V (CPU) and PCIe (GPU) 8-pin connectors, noting that they use distinct pin arrangements and mechanical keying.
PCIe power cables provide +12V on different pin locations compared to EPS12V cables, making them non-interchangeable.

Key Concept

Motherboard Power Connector Standards and Voltage Delivery (24-pin ATX vs 8-pin EPS12V)
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Topics

Motherboards Form Factors and Connectors

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