What program are you using to load the CPU?. Have you got any programs running in the background?, any automated tasks that cut in when you're not 'activly' using the CPU?. Try 'Ctrl' 'Alt' & 'Delete' to bring up the 'Close Program' box and shut everything down except 'Explorer' and 'Sys' or 'Systray' (depending on OS). You'll have a true 'idle' then...
I can't think of any other reason :shrug: ...
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