Hi, ich hab da mal eine ganz blöde Frage. Ich würde gerne wissen wie heiß mein P4 1,8 GHz (Sockel423) werden darf. Ok, das hab ich nun in der Spezifikation gefunden, 78°C. Aber der folgende Test läst mich nicht mehr los. Leider ist mir das etwas zu fachlich geschrieben als das ich es mit meinem Englisch vernünftig verstehen könnte. Ich verstehe das nun so das die CPU wenn sie kurz vor der Max Temperatur ist einfach die Taktrate runter setzt. Aber was sind das für Prozentzahlen die man einstellen kann? Ich habe nämliche Diese Option im Bios und frage mich schon lange was sie bewirkt. Könnte mir da vielleicht jemand weiter helfen? Danke. Ausserdem wird laut Spezifikation die Temperatur ja in der Mitte gemessen (T Case), ich messe aber am Rand (Kühlkörper). Wie groß wird da wohl der Unterschied sein? 20°C? Auszug aus der Spezifikation: Thermal Monitor Thermal Monitor is a new feature found in the Pentium 4 processor which allows system designers to design lower cost thermal solutions, without compromising system integrity or reliability. By using a factory-tuned, precision on-die thermal sensor, and a fast acting thermal control circuit (TCC), the processor, without the aid of any additional software or hardware, can keep the processors' die temperature within factory specifications under typical real world operating conditions. Thermal Monitor thus allows the processor and system thermal solutions to be designed much closer to the power envelopes of real applications, instead of being designed to the much higher maximum theoretical processor power envelopes. Thermal Monitor controls the processor temperature by modulating the internal processor core clocks. The processor clocks are modulated when the TCC is activated. 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. Once automatic mode is enabled, the TCC will activate only when the internal die temperature is very near the temperature limits of the processor. When TCC is enabled, and a high temperature situation exists (i.e. TCC is active), the clocks will be modulated by alternately turning the clocks off and on at a a 50% duty cycle. Clocks will not be off more than 3 µs when TCC is active. Cycle times are processor speed dependent and will decrease as processor core frequencies increase. 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. Once the temperature has returned to a non-critical level, and the hysteresis timer has expired, modulation ceases and TCC goes inactive. Processor performance will be decreased by ~50% when the TCC is active (assuming a 50% duty cycle), however, with a properly designed and characterised thermal solution the TCC most likely will only be activated briefly when the system is near maximum temperature and during the most power intensive applications. For automatic mode, the 50% duty cycle is factory configured and cannot be modified. Also, automatic mode does not require any additional hardware, software drivers or interrupt handling routines. The TCC may also be activated via On-Demand mode. If bit 4 of the ACPI Thermal Monitor Control Register is written to a 1 the TCC will be activated immediately, independent of the processor temperature. When using On-Demand mode to activate the TCC, the duty cycle of the clock modulation is programmable via bits 3:1 of the same ACPI Thermal Monitor Control Register. In automatic mode, the duty cycle is fixed at 50% on, 50% off, however in On-Demand mode, the duty cycle can be programmed from 12.5% on/ 87.5% off, to 87.5% on/12.5% off in 12.5% increments. On-Demand mode may be used at the same time Automatic mode is enabled, however, if the system tries to enable the TCC via On-Demand mode at the same time automatic mode is enabled AND a high temperature condition exists, the 50% duty cycle of the automatic mode will override the duty cycle selected by the On-Demand mode. An external signal, PROCHOT# (processor hot) is asserted any time the TCC is active (either in Automatic or On-Demand mode). Bus snooping and interrupt latching are also active while the TCC is active. The temperature at which the thermal control circuit activates is not user configurable and is not software visible. Besides the thermal sensor and thermal control circuit, the Thermal Monitor feature also includes one ACPI register, one performance counter register, three model specific registers (MSR), and one I/O pin (PROCHOT#). All are available to monitor and control the state of the Thermal Monitor feature. Thermal Monitor can be configured to generate an interrupt upon the assertion or de-assertion of PROCHOT# (i.e. upon the activation/deactivation of TCC). If automatic mode is disabled the processor will be operating out of specification and cannot be guaranteed to provide reliable results. Regardless of enabling of the automatic or On-Demand modes, in the event of a catastrophic cooling failure, the processor will automatically shut down when the silicon has reached a temperature of approximately 135 °C. At this point the system bus signal THERMTRIP# will go active and stay active until the processor has cooled down and RESET# has been initiated. THERMTRIP# activation is independent of processor activity and does not generate any bus cycles.