A technician is evaluating motherboard form factor specifications to select a suitable rep… — CompTIA A+ (Core 1 & Core 2)

A technician is evaluating motherboard form factor specifications to select a suitable replacement board for a desktop chassis that requires backwards compatibility with existing ATX mounting points and rear I/O shield cutouts while fitting inside a smaller enclosure. Which of the following statements correctly describe the design specifications and motherboard connector features of the microATX form factor compared to standard ATX? (Select TWO.)

MicroATX motherboards feature maximum physical dimensions of $9.6 \times 9.6\text{ inches}$ ( $244 \times 244\text{ mm}$ ) and typically accommodate a maximum of four expansion slots.Answer
MicroATX motherboards share top mounting hole alignment pattern points and standard rear I/O panel dimensions with full-size ATX motherboards.Answer
C
MicroATX motherboards mandate the use of small-outline dual in-line memory modules (SO-DIMMs) to conserve printed circuit board surface space.
D
MicroATX motherboards replace the standard 24-pin ATX main power header with a proprietary 14-pin motherboard power interface.

Answer

The microATX form factor specifies maximum dimensions of

9.6 \times 9.6\text{ inches}

(

244 \times 244\text{ mm}

) supporting up to four expansion slots, and maintains backwards compatibility by sharing top mounting hole positions and rear I/O shield dimensions with standard ATX chassis.

The microATX specification defines a maximum board size of

9.6 \times 9.6\text{ inches}

(

244 \times 244\text{ mm}

) with up to 4 expansion slots. Additionally, microATX was engineered to be backward compatible with ATX chassis by retaining the same top standoff mounting locations and standard rear I/O panel layout.

Step-by-Step Solution

Identify physical dimensions and slot limitations of microATX

MicroATX boards are defined up to

9.6 \times 9.6\text{ inches}

(

244 \times 244\text{ mm}

) with a maximum of 4 expansion slots.

Standard ATX measures up to

12 \times 9.6\text{ inches}

with up to 7 slots, whereas microATX reduces height while retaining width.

Verify mechanical layout and chassis compatibility rules

MicroATX boards align with standard ATX top standoff mounting holes and use identical rear I/O panel dimensions.

This backward compatibility allows microATX boards to mount directly into standard ATX cases.

Evaluate memory and power interface standards

MicroATX uses standard 24-pin ATX main power connectors and full-size desktop DIMM slots.

Proprietary headers or laptop memory form factors (SO-DIMMs) are not part of the standard microATX specification.

Key Concept

Motherboard Form Factors and Compatibility Standards (microATX vs ATX)

Question

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