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core i7 920 whats the difference between prochot and cpu thermal monitor

post #1 of 8
Thread Starter 
ok my overclocks are stable but i believe somthing throttles down and it slows down from time to time .

however my main and only quesion is what is
prochot and cpu thermal monitor

and if needed wats the difference

thanks
winter
post #2 of 8
i7's throttle at 90*C or there abouts. if you have a air cooled heatsink touch it when the cpu has been loaded up and if its extremely hot, like, burns you on the touch, your close or over the throttle limit. only other way to knw is load the cpu up, and use Hardware Monitor. i would trust prochot and CPU Themal Monitor
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post #3 of 8
Thread Starter 
ok

but what is the definition of proc hot what does it do

also what is the definition of cpu thermal monitor what does it do
thanks
winter
post #4 of 8
Thread Starter 
ok, so why do many people disable these things? is'nt there more to it? i read the link but it was complicated at best. if the processor shuts down autamaticly wich function does that? therm monitor or prochot?

as far as core clock and voltage being reduced when processor is warm im not to worried about that the other should be sufficient protection
post #5 of 8
Thermal Throttling and Shut-down are to be avoided, they might stop your chip melting, but they don't eliminate the chance of damage and the last thing you want to do is to disable those functions (can you even do that?)

What temperatures are you running at anyway?!

For 3.6GHz I can only imagine you're using a stock cooler to be reaching thermal shutdown/throttling.
    
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post #6 of 8
Quote:
Originally Posted by Winterlord;12179757 
ok, so why do many people disable these things? is'nt there more to it?

Because they are blindly following an overclock guide that gives them bad advice, or they dont know what prochot/tm are for either. And neither has anything to do with performance or stability, they simply protect the cpu once it reaches its maximum safe temperature/tjmax.

For example, TJmax is 100C on my i7 950. At around 99-100C, THERMAL MONITOR kicks in and reduces frequency first, then voltage second, to prevent cpu from overheating. If disable thermal monitor in the bios, the cpu will not reduce frequency or voltage and likely exceed tjmax.

I dont think bioses will let you disable Prochot out signal, so when you disable prochot in bios, it only disables sensory component of prochot, but that isnt a good idea either.

But bottom line if you disable either, it will not help you overclock, all you have done is prevent the cpu from being able to properly protect itself at tjmax, ie 100C on my cpu. At 15-20C beyond tjmax, 115-120C, the cpu is supposed to shut itself down in a final attempt to prevent permanent damage, if you could turn off prochot completely in bios, it would remain to be seen if cpu turns itself off, I can tell you what happened to mine...

I am rge on xtreme, during temp testing, I disabled both prochot and thermal monitor while temp testing a delided (removed IHS) E7200, surface temp was little over 100C, core temp was around 130C and rising quickly as the core melted (link to pic of melted core). So much for that cpu protecting itself.
http://www.xtremesystems.org/forums/showthread.php?p=3077591&highlight=E7200#post3077591

Although people do disable prochot and thermal monitor, they typically wont have a problem unless heatsink comes loose or something like that.
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post #7 of 8
Thread Starter 
they are both 2 different functions in the bios. so should i leave them both enabled? dos'nt one of them cut puter to cpu just a tad aftwer its used 150watts?
post #8 of 8
PROCHOT is a singnal that is tripped when the CPU is about to hit it's TJMax. Normally this would automatically throttle the chip to protect it, but most enthusiast boards allow the bi-directional aspect to be disabled. This means you can still read the PROCHOT signal, but that it won't throttle.

Thermal monitor is probably a TDP limiter.

I would leave PROCHOT (unless you want your CPU to be able to run full speed at ~100C for some reason), and disable thermal monitor.
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