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Thermal, temperature, power, cooling, security, virus, failsafe, overheating, throttling, overclocking, DVS, The Pentium 4’s second on-chip sensor is a thermal diode that is software visible. The diode produces a voltage across two external pins that can be converted using external A/D hardware on the motherboard. ACPI uses this reading to implement its thermal management policy. Our Pentium 4 experiments were performed with an Asus P4P800 motherboard, a 1.52 V, 2.6 GHz “Northwood” CPU, Windows XP Service Pack 1, a Winbond W83627THF sensor
chip, SpeedFan fan-control software, and Asus AiBooster DVS control. With SpeedStep and PowerNow, voltage and frequency pairs are set through internal CPU configuration registers. These internal configuration registers are accessed through device drivers such as the module msr.o on Linux. On our AMD 1800+, nominally rated at 1.55 V and 1.5 GHz, we are able to set the frequency between 550 Mhz and 1.5 GHz with voltages between 1.10 V and 1.55 V in .05 V increments. With the Asus motherboard overclocking technology, settings are altered through a windows application known as AIBooster.
Tags : frequency pairs, thermal diode, asus p4p800, asus p4p800 motherboard, windows xp service pack, amd 1800, internal cpu, cpu configuration, internal configuration, sensor chip, temperature power, asus motherboard, pentium 4, powernow, fan control
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