Intel Pentium 4 Processor on 90 nm Process Thermal and Mechanical Design Guidelines

R
Intel
®
Pentium
®
4 on 90 nm Process Thermal Design Guide 3
Contents
1 Introduction ......................................................................................................................... 9
1.1 Overview............................................................................................................... 10
1.2 References ........................................................................................................... 11
1.3 Definition of Terms ............................................................................................... 11
2 Mechanical Requirements ................................................................................................ 13
2.1 Processor Package .............................................................................................. 13
2.2 Heatsink Attach .................................................................................................... 14
3 Thermal Requirements ..................................................................................................... 15
3.1 Processor Case Temperature and Power Dissipation......................................... 15
3.2 Intel
®
Pentium
®
4 Processor on 90 nm Process Thermal Solution Design
Considerations ..................................................................................................... 16
3.2.1 Heatsink Solutions ................................................................................ 16
3.2.1.1 Heatsink Design Considerations ......................................... 16
3.2.1.2 Thermal Interface Material .................................................. 17
3.2.2 System Thermal Solution Considerations ............................................ 17
3.2.2.1 Chassis Thermal Design Capabilities ................................. 17
3.2.2.2 Improving Chassis Thermal Performance........................... 17
3.2.2.3 Omni Directional Airflow ...................................................... 18
3.2.3 Characterizing Cooling Performance Requirements ............................ 18
3.2.3.1 Example............................................................................... 20
3.3 Thermal Metrology for the Intel
®
Pentium
®
4 Processor on 90 nm Process ........ 21
3.3.1 Processor Heatsink Performance Assessment .................................... 21
3.3.2 Local Ambient Temperature Measurement Guidelines ........................ 21
3.3.3 Processor Case Temperature Measurement Guidelines ..................... 23
3.4 Thermal Management Logic and Thermal Monitor Feature................................. 24
3.4.1 Processor Power Dissipation................................................................ 24
3.4.2 Thermal Monitor Implementation.......................................................... 24
3.4.2.1 Thermal Monitor .................................................................. 25
3.4.3 Bi-Directional PROCHOT# ................................................................... 26
3.4.4 Operation and Configuration................................................................. 26
3.4.5 On-Demand Mode ................................................................................ 27
3.4.6 System Considerations......................................................................... 28
3.4.7 Operating System and Application Software Considerations............... 28
3.4.8 Legacy Thermal Management Capabilities .......................................... 29
3.4.8.1 On-Die Thermal Diode ........................................................ 29
3.4.8.2 THERMTRIP#...................................................................... 29
3.4.9 Cooling System Failure Warning .......................................................... 30
3.5 Thermal Specification........................................................................................... 30
3.5.1 Thermal Profile...................................................................................... 30
3.5.2 T
CONTROL
................................................................................................... 31
3.5.3 How On-die Thermal Diode, T
CONTROL
and Thermal Profile work together32
3.5.3.1 On-die Thermal Diode less than T
CONTROL
........................... 32
3.5.3.2 On-die Thermal Diode greater than T
CONTROL
...................... 32