I have been using Vias HW monitor to check my cpu temps. It has an option to warn me when the "Cpu Hysteresis Temp" is too low. What is a "Cpu Hysteresis Temp"?

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Athlon 900 TB
on a KT7A-RAID
128MB PC133 CL2
ATI Radeon 32MB DDR
KDS VS-190 19"
MS IntelliMouse Explorer