Which of the following represents fan connector sizes on a motherboard?

Question

Options

• A1-pin and 2-pin
• B1-pin and 3-pin
• C2-pin and 3-pin
• D2-pin and 5-pin

• A
  7% (4)
• B
  4% (2)
• C
  88% (50)
• D
  2% (1)

Explanation

Motherboard fan headers commonly come in 2-pin and 3-pin configurations. A 2-pin connector provides only power (12V and ground), offering no speed feedback or control. A 3-pin connector adds a tachometer signal wire, allowing the motherboard to monitor fan RPM. (Modern boards also use 4-pin PWM headers for full speed control, but the foundational sizes are 2-pin and 3-pin.) The other options (1-pin, 4-pin in isolation, 5-pin) do not represent standard fan header sizes found on motherboards in this context.

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