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Thanks for all the information!

Steve

I'm using Windows 7 Professional.

Note that when I set the 50% number in Boinc, it was "% of the processors", not "% CPU time".  Is that so bad?  I don't want to do this, but I will if it's the only way to control things.

I'm curious why the choice of CPU temperature matters, in terms of whether throttling is effective.  As long as the temperature I choose is well above the idle temperature, shouldn't TThrottle be equally effective at limiting things to that temperature?

The computer is in a home office which can be quite cool at night - then the core temp only goes to about 54C under full load.  I heat the room in the daytime, and then it gets warmer.  With the room at 24C (warmer than normal) the core temp goes to about 62C.   I have liquid cooling and several case fans, but just good standard equipment - nothing extreme.

At the moment, I'm running rosetta@home, which doesn't use the GPU.  I have SETI enabled, but it isn't giving me any tasks.

Maybe I shouldn't worry about temperatures, since mine are so low, but I have other goals in mind.  For example, at 55C TThrottle will automatically let Boinc run at full speed at night, and slow it a bit during the day when I want the system to be more responsive for other tasks.

Sorry this got so long.  You gave me a lot to think about.

I have just started using Boinc and TThrottle.  With the Boinc computing preferences set to 100% and TThrottle off, I see 100% CPU usage as expected.  This is a 6-core processor ( i7-3930K) which shows up as 12 CPU bars Windows.  With TThrottle on and the temperature limit set to 55C the indicated run percentage drops gradually to 2%, but the task manager shows that CPU usage is is still at 84% and the temperature doesn't drop to 55C.

Everything else seems okay.  I turned on "Auto active" and there are 12 programs listed.  If I suspend the Boinc tasks, the core temperatures drop quickly into the low 40s and then more gradually into the 30s.  TThrottle's run percentage goes to 100%.  Coming out of suspend, CPU usage first jumps to 100%, and then as TThrottle detects the processes and temperature increase the numbers start to drop.

The only problem is that they go back to the values I mentioned before - 2% in TThrottle but 84% in the task manager.

TThrottle seems like exactly what I want, if there is a way to overcome this.  Any ideas?

[added a bit later]  I find that if I set the Boinc preferences to 50% of the processors, things work as expected.  TThrottle gradually adjust the Running cpu and temperatures are controlled as they should be.  Windows shows a CPU load 1/2 as much as TThrottle's setting, which I suppose is normal since half of the 12 slots are idle.  Perhaps this is a clue to what is going on.