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Apple Computing Products:
macOS - Notebook Hardware
Rember on the MBP-Or, "how to cook an Apple"
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<blockquote data-quote="Geeky1" data-source="post: 505269" data-attributes="member: 34442"><p>The fans in the MBP run all the time; I did not see any significant RPM increase, or at least I didn't notice any, no. I forgot to mention it, but I should have. </p><p></p><p>However, that in and of itself does not necessarily indicate that the CPU did not hit well over 100*C, nor does it necessarily indicate that the fans are operating abnormally for a MBP. All the evidence that I've seen points to a serious deficiency in the thermal interface between the CPU, GPU, and northbridge and the heatsink on these machines; (evidence in this case being the massive disparity between the heatpipe/heatsink temperatures and the chip temperatures under load) my personal belief is that it's due to a very poorly engineered mounting system that effectively forces the thermal grease to act as the primary interface between the CPU and the heatsink in some (though-due to variations in the height of the chips-not all) machines rather than as an 'assistant', if you will, which is its normal role. (I should note, though, that other potential causes for the temperature disparities include poor sensor placement and/or calibration)</p><p></p><p>And since the sensors that control fan speed (as far as I know) are mounted on the heatpipe, and the heatpipe stays much cooler than the CPU, it's entirely possible that they wouldn't speed up significantly even as the CPU got very, very hot. I notice that whenever I run the CPU under high loads, the fans don't speed up. I notice that with two other MBPs as well (the one I had to exchange for a different reason, and my grandmother's).</p><p></p><p>It is entirely possible that the CPU is not getting that hot and that it's a glitch. I have no way of accurately measuring it without voiding my warranty, and I'm not that dedicated to the pursuit of knowledge. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite7" alt=":p" title="Stick out tongue :p" loading="lazy" data-shortname=":p" /> But, I think, based on the history of heat issues with the MBP, that it's more likely that this is an actual problem. I could, however, be wrong. If anyone wants to send me their MBP and let me take it apart, I'll investigate further <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /> <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite7" alt=":p" title="Stick out tongue :p" loading="lazy" data-shortname=":p" /></p></blockquote><p></p>
[QUOTE="Geeky1, post: 505269, member: 34442"] The fans in the MBP run all the time; I did not see any significant RPM increase, or at least I didn't notice any, no. I forgot to mention it, but I should have. However, that in and of itself does not necessarily indicate that the CPU did not hit well over 100*C, nor does it necessarily indicate that the fans are operating abnormally for a MBP. All the evidence that I've seen points to a serious deficiency in the thermal interface between the CPU, GPU, and northbridge and the heatsink on these machines; (evidence in this case being the massive disparity between the heatpipe/heatsink temperatures and the chip temperatures under load) my personal belief is that it's due to a very poorly engineered mounting system that effectively forces the thermal grease to act as the primary interface between the CPU and the heatsink in some (though-due to variations in the height of the chips-not all) machines rather than as an 'assistant', if you will, which is its normal role. (I should note, though, that other potential causes for the temperature disparities include poor sensor placement and/or calibration) And since the sensors that control fan speed (as far as I know) are mounted on the heatpipe, and the heatpipe stays much cooler than the CPU, it's entirely possible that they wouldn't speed up significantly even as the CPU got very, very hot. I notice that whenever I run the CPU under high loads, the fans don't speed up. I notice that with two other MBPs as well (the one I had to exchange for a different reason, and my grandmother's). It is entirely possible that the CPU is not getting that hot and that it's a glitch. I have no way of accurately measuring it without voiding my warranty, and I'm not that dedicated to the pursuit of knowledge. :P But, I think, based on the history of heat issues with the MBP, that it's more likely that this is an actual problem. I could, however, be wrong. If anyone wants to send me their MBP and let me take it apart, I'll investigate further ;) :P [/QUOTE]
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Apple Computing Products:
macOS - Notebook Hardware
Rember on the MBP-Or, "how to cook an Apple"
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