Intel Pentium 4 Processors 570/571, 560/561, 550/551, 540/541, 530/531 and 520/521 Supporting Hyper-ThreadingTechnology* Datasheet

4 Datasheet
Contents
5.2.3 On-Demand Mode .................................................................................................81
5.2.4 PROCHOT# Signal................................................................................................ 82
5.2.5 THERMTRIP# Signal............................................................................................. 82
5.2.6 T
CONTROL
and Fan Speed Reduction....................................................................82
5.2.7 Thermal Diode .......................................................................................................83
6 Features ........................................................................................................................................85
6.1 Power-On Configuration Options........................................................................................85
6.2 Clock Control and Low Power States .................................................................................85
6.2.1 Normal State..........................................................................................................86
6.2.2 HALT and Enhanced HALT Powerdown States ....................................................86
6.2.3 Stop-Grant State....................................................................................................87
6.2.4 Enhanced HALT Snoop or HALT Snoop State, Grant Snoop State......................88
7 Boxed Processor Specifications....................................................................................................89
7.1 Mechanical Specifications .................................................................................................. 90
7.1.1 Boxed Processor Cooling Solution Dimensions ....................................................90
7.1.2 Boxed Processor Fan Heatsink Weight................................................................. 91
7.1.3 Boxed Processor Retention Mechanism and Heatsink
Attach Clip Assembly.............................................................................................91
7.2 Electrical Requirements......................................................................................................91
7.2.1 Fan Heatsink Power Supply ..................................................................................91
7.3 Thermal Specifications .......................................................................................................93
7.3.1 Boxed Processor Cooling Requirements...............................................................93
7.3.2 Variable Speed Fan...............................................................................................95