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Technology Stocks : Advanced Micro Devices - Moderated (AMD) -- Ignore unavailable to you. Want to Upgrade?

To: Ali Chen who wrote (74274)	3/12/2002 3:19:21 PM
From: Petz	Respond to of 275872

There is a real serious lack of info in the spec documents. From the description of "Thermal Monitor" -- Thermal Monitor uses two modes to activate the TCC: Automatic mode and On-Demand mode. Automatic mode is required for the processor to operate within specifications and must first be enabled via BIOS. So why do they include the other mode! Once automatic mode is enabled, Intel® Pentium® 4 Processor with 512KB Cache on .13 Micron Process the TCC will activate only when the internal die temperature is at very near the temperature limits of the processor. (Unbelievably, these limits are not given anyplace in the spec!) When the TCC is enabled, and a high temperature situation (vague again) exists (i.e. TCC is active), the clocks will be modulated by alternately turning the clocks off and on at a duty cycle specific to the processor (typically 30-50%). Cycle times are processor speed dependent and will decrease linearly as processor core frequencies increase. Once the temperature has returned to a non-critical level, (definition, please) modulation ceases and TCC goes inactive. A small amount of hysteresis has been included to prevent rapid active/inactive transitions of the TCC when the processor temperature is near the trip point. Processor performance will be decreased by approximately the same amount as the duty cycle when the TCC is active, however, with a properly designed and characterized thermal solution, the TCC will only be activated briefly when running the most power intensive applications in a high ambient temperature environment. Petz