July 2004
Intermediate to advanced
1744 pages
35h 3m
English
Content preview from The Unabridged Pentium 4 IA32 Processor GenealogyBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Improved Thermal Monitor Mode
The Thermal Monitor mode (see “The Thermal Monitoring Facilities” on page 1340) has been enhanced (and is referred to as Thermal Monitor 2). Rather than using the internal Stop Clock signal's duty cycle to control the processor's internal temperature, it automatically controls the processor's BCLK-to-processor clock ratio and core operating voltage. This is referred to as Intel® Mobile Voltage Positioning (IMVP):
When the on-die thermal sensor indicates that the die temperature is too high, the processor can automatically perform a transition to a lower frequency/voltage specified in a software programmable MSR (not documented in the public domain).
The processor waits for a fixed time period. If the die temperature ...
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