Intel 640 User Guide - Page 13
Introduction, Thermal/Mechanical Design Guide
UPC - 683728178901
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Introduction R Term Description FSC TCONTROL_BASE TCONTROL_OFFSET TCONTROL PWM Health Monitor Component BTX TMA Fan Speed Control: Thermal solution that includes a variable fan speed which is driven by a PWM signal and uses the on-die thermal diode as a reference to change the duty cycle of the PWM signal. Constant from the processor datasheet that is added to the TCONTROL_OFFSET that results in the value for TCONTROL Value read by the BIOS from a processor MSR and added to the TCONTROL_BASE that results in the value for TCONTROL TCONTROL is the specification limit for use with the on-die thermal diode. Pulse width modulation is a method of controlling a variable speed fan. The enabled 4 wire fans use the PWM duty cycle % from the fan speed controller to modulate the fan speed. Any standalone or integrated component that is capable of reading the processor temperature and providing the PWM signal to the 4 pin fan header. Balanced Technology Extended: BTX is an enhanced form factor specification for desktop platforms. Thermal Module Assembly. The heatsink, fan and duct assembly for the BTX thermal solution. § Thermal/Mechanical Design Guide 13