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OCCT Give a msg "CPU too hot" at 75C. - Page 2

post #11 of 13
Thread Starter 
Thanks guys. So I'm still in the green zone smile.gif
Prime running for about 4 hours now and will keep going for another 4.
post #12 of 13
Quote:
Originally Posted by infected rat;12233561 
Nope, there is a sensor there. You are nearly right, the sensor is at the top of the center of the IHS, only it's just under the heat spreader not some notional value above it as you suggest. There are many programs that will allow you to read the temperature of the Tcase sensor. The Asus AI suite displays the value of that sensor for one. Everest will display it also.

Your final paragraph is correct.

There is no Tcase sensor. The cpu diode (which you are calling tcase sensor) is not just under IHS, it is between cores deep in the core substrate. This cpu diode was never meant to measure tcase, and in fact it is intel's old measure of "core temp". Intel then published this white paper, that stated since the cpu diode was between cores instead of in the hot spots, the resulting error using approximate offsets was decreasing efficiency by in cases engaging throttling when not needed. So intel then placed multiple sensors on each die, the hottest read via DTS and displayed as core temp, but left the cpu diode.

It is an error to use cpu diode as tcase sensor for several reason. 1) it is in the wrong location. 2) cpu diode is calibrated via bios, it is not calibrated by intel on an individual basis, and is prone to all kinds of error, which is why intel abandoned its use for core temps (not tcase temps). 3) Tcase specs is measurement of IHS at load stock settings, and is provided for cooling design, and has nothing to do with cpu diode.

Here is my post using Stanford article pic, that illustrates the error of using cpu diode (instead of the multiple on die DTS) to represent either core temp or IHS specs "tcase".
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post #13 of 13
That's great information and links, thanks for the correction. It seems that I have always confused the Tcase sensor and cpu diode. It certainly makes sense that Tcase is provided for cooling design. I'll have a good read of that white paper when I get a moment.
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The Oracle
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Samsung 256GB 850 Pro Samsung 256GB 840 Pro Westerb Digital Caviar Black 1TB XSPC Rasa ES240 + 2 GT AP-15s 
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