System Cables And Connectors; System Cable Kitting; Cpu Thermal Solution And System Fan Mechanical Interface - Intel Thin Mini-ITX System Design Manual

5.3

System Cables and Connectors

Motherboards and cabling designed to this design guide shall have motherboard
headers, mating cable connectors, and cable routing that when mated and installed fit
within the volumetric envelope defined in section 2.4.2 of the Mini-ITX Addendum
Version 2.0 To the microATX Motherboard Interface Specification Version 1.2.
Keeping within this volumetric will ensure motherboards and cables will work together
in chassis that wrap tightly around the Thin Mini-ITX volumetric.
5.3.1

System Cable Kitting

Cables that are an integral part of the chassis must ship with the chassis. These
include cables for flat panel displays, user interface buttons, SATA devices, external
connectors, web cams, microphone, speakers, system fans, and custom heat sink
fans. Chassis that will use the reference thermal solution in this design guide will
likely need to supply a system fan/blower to cool the various motherboard
components other than the CPU.
Cables that do not directly interface with the chassis, should ship with the
motherboard, particularly if they are not commonly available. The cables should be
long enough to reach components that are located on the opposite end of a chassis
using a 24" screen.
5.4 CPU Thermal Solution and System Fan Mechanical
Interface
Standardized, low profile heat pipe based thermal solutions can be designed into Thin
Mini-ITX compatible chassis. These solutions include Intel's HTS1155LP described in
Chapter 6, and compatible solutions from other vendors which are designed to the
"Specification for Heat Pipe based Thermal Solutions for Thin Mini-ITX Based PCs".
The motherboard must support the fan requirements referred in Section 0 and the
mechanical requirements described in Section 5.1.
Chassis requirements:
 Provide heat exchanger mechanical shock retention feature attach holes and screws
at one or more of the locations specified in Figure 5-3, Figure 5-4 or Figure 5-5
 Provide blower mechanical attach features at one or more of the locations specified
in Figure 5-3, Figure 5-4 or Figure 5-5.Figure 5-5 shows two different ways a single
blower can be implemented with this shown heatsink installation orientation. The
blower is offset from the heatsink 2 mm in order to divert some of the cool air over
the voltage regulator components.
 The CPU blower attach standoff thread size is M2.5 x 0.45 mm thread pitch.
 A minimum of a 3mm air gap above and below the standard 19mm blower housing
is strongly recommended to better support blower performance and system
acoustics, as shown in Figure 5-6. Using a smaller gap will severely degrade air
intake into the fan and result in a significant increase in system noise.
46 Thin Mini-ITX Based PC System Design Guide
Mechanical