| Electronics > Projects, Designs, and Technical Stuff |
| really proper way to apply thermal compound? |
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| wraper:
--- Quote from: Mr. Scram on December 10, 2018, 11:50:20 pm --- --- Quote from: wraper on December 10, 2018, 08:58:52 pm ---You cannot make a different pressure with that heatsink and springy backplate on the opposite side. Pressure applied is a constant amount, period. And how pressure would matter to begin with? And I say it again, there was a freaking air bubble when I disassembled it :palm:. EDIT: And that graphics card would not go over 95oC which is target temperature. It would increase fan speed and throttle. --- End quote --- I don't have trouble believing that you saw an air bubble upon disassembly. The issue is the implied causation based on a single uncontrolled observation. That's tentative in the best of circumstances and probably worse in a matter where discussions tend to be endless in lieu of hard repeatable evidence. --- End quote --- It's quite obvious that heat transfer will suck through air bubble. And with such high amount of heat dissipated from small area it's obviously will have severe effects. |
| coppercone2:
can you do a ultrasonic reflection test? |
| Mr. Scram:
--- Quote from: wraper on December 10, 2018, 11:53:54 pm ---It's quite obvious that heat transfer will suck through air bubble. And with such high amount of heat dissipated from small area it's obviously will have severe effects. --- End quote --- The videos provided before show that these kind of common knowledge factoids in reality don't have the impact some people purport them to have. Things like the method of application, partial TIM coverage or too much TIM turn out to cause differences well within the margin of error. This means the results are effectively the same across the board. Even though conventional knowledge says these factors should make a difference, they don't appear to do so. That makes it not as obvious that an air bubble would have an effect. The only reasonable conclusion seems to be that there isn't enough information to draw conclusions, although it should be noted that none of the other factors did make any difference. Your anecdotal observation could be the starting point for a more controlled investigation, though. |
| wraper:
--- Quote from: Mr. Scram on December 11, 2018, 12:14:47 am --- --- Quote from: wraper on December 10, 2018, 11:53:54 pm ---It's quite obvious that heat transfer will suck through air bubble. And with such high amount of heat dissipated from small area it's obviously will have severe effects. --- End quote --- The videos provided before show that these kind of common knowledge factoids in reality don't have the impact some people purport them to have. Things like the method of application, partial TIM coverage or too much TIM turn out to cause differences well within the margin of error. This means the results are effectively the same across the board. Even though conventional knowledge says these factors should make a difference, they don't appear to do so. That makes it not as obvious that an air bubble would have an effect. The only reasonable conclusion seems to be that there isn't enough information to draw conclusions, although it should be noted that none of the other factors did make any difference. Your anecdotal observation could be the starting point for a more controlled investigation, though. --- End quote --- Those tests are done with CPUs which have heat spreader, thus bubbles have much less effect. Not to say, you won't see temperature increase in monitoring software if bubble is not above the area with temperature sensor. |
| Mr. Scram:
--- Quote from: wraper on December 11, 2018, 12:21:50 am ---Those tests are done with CPUs which have heat spreader, thus bubbles have much less effect. Not to say, you won't see temperature increase in monitoring software if bubble is not above the area with temperature sensor. --- End quote --- I agree that there may be different circumstances, but without any kind of controlled testing it's quite impossible to say whether a bubble can make these kinds of differences or not. |
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