microATX Motherboard Interface Specification

Version 1.2

Page 7

1.2 microATX Form-factor Overview

Figure 1 shows an example of a system using a microATX motherboard.

9.6”

FRONT

of board

REAR of board

(244 mm)

PCI, ISA, or AGP add-in board slots

Not to scale

Processor location

Fan

5.25” drive bay

for CD-ROM

9.6” x 9.6” (244 x 244 mm) motherboard

9.6” (244 mm)

3.5” drive bay

for FDD

Power supply

location

Expansion slot #5

Expansion slot #6

Expansion slot #4

Expansion slot #7

ATX-compatible

double-high

expandable I/O window

6.25” (158.75 mm)

1.75” (44.45 mm)

Alternate power supply

and fan location

(over processor)

Slots for system memory

IDE, FDD,

and front

panel

connectors

System Fan

Figure 1: Example of a microATX System

(oriented for example installation in a tower, side view; front of board to the right in this figure)

Note: The example in Figure 1 shows expansion slot numbers 4 through 7. Slots 1 through 3 are present on an ATX

motherboard, which is wider than a microATX board.