Motherboard Design; Figure 2. Atx Motherboard Hole Locations For Direct Chassis-Attach - Intel Pentium 4 Design Manual

Intel® Pentium® 4 Processor in the 423-pin Package Thermal-Mechanical Support Design Guide
Version 1.0

2.1 Motherboard Design

The retention mechanism should be located in relation to the ATX mounting holes as
shown in Figure 2 to allow for direct attachment to the chassis. The two-piece enabled
retention mechanism cannot be pre-attached to the motherboard. Therefore, motherboards
intended for use by system integrators should supply two (2) retention mechanisms and two
(2) heatsink clips with each board. Intel boxed processors will not include these
components. ATX chassis will provide four (4) removable standoffs and four (4) screws
that will attach the retention mechanisms and motherboard to the chassis.

Figure 2. ATX Motherboard Hole Locations for Direct Chassis-Attach

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