The flattest CPU in the world, lapping done right [3950x] - Page 2 - Overclock.net - An Overclocking Community

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The flattest CPU in the world, lapping done right [3950x]

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post #11 of 21 (permalink) Old 07-24-2020, 02:15 PM
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Nice work.
I have seen Oxtool on youtube about this.
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post #12 of 21 (permalink) Old 07-24-2020, 02:34 PM
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i do wonder how this affects a 3900X/3950X that the ihs is important and used to spread the heat when you start removing copper by lapping.


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post #13 of 21 (permalink) Old 07-24-2020, 03:13 PM
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Quote: Originally Posted by BroadPwns View Post
Yes, you still need TIM. You always need some kind of an interface between any surface, especially heat transfering one.
No you don't. Thermal paste is a poor heat conductor and is only used because the surfaces aren't flat, so you need the paste to fill it in. This is also why you want as little paste as possible.

If you get both surfaces flat and smooth, you should not use thermal paste, as it will only be hurting. I'd argue that lapping is a waste of time if you do it and still use thermal paste.

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post #14 of 21 (permalink) Old 07-24-2020, 03:37 PM
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You do, strictly because you can't get a perfect flat surface without any defects and micropores. And the moment you stick one surface to another - you create extra scratches. Did lap 4690k and Raijintek Tisis to a mirror shine, using a glass as a surface under the sandpaper (gradation gradually increasing from 1500 to 8000 water paper), adding a thermal paste still dropped temperatures.

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post #15 of 21 (permalink) Old 07-24-2020, 04:13 PM
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Might be a good idea to apply Tim to both surfaces and then use a razor blade to scrape off the excess so you still have Tim in the scratches and whatnot.

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post #16 of 21 (permalink) Old 07-24-2020, 04:32 PM
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post #17 of 21 (permalink) Old 07-24-2020, 05:42 PM
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Don't stop lapping the die until you can see through it. Image credit Kingpin Cooling.
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post #18 of 21 (permalink) Old 08-08-2020, 02:00 PM - Thread Starter
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Quote: Originally Posted by BroadPwns View Post
You do, strictly because you can't get a perfect flat surface without any defects and micropores. And the moment you stick one surface to another - you create extra scratches. Did lap 4690k and Raijintek Tisis to a mirror shine, using a glass as a surface under the sandpaper (gradation gradually increasing from 1500 to 8000 water paper), adding a thermal paste still dropped temperatures.
Not to be mean but your 8000 grit paper got you no closer to a flat surface than your 1500 grit sand paper — or for that matter 120 grit.
Yes, flatness is an ideal that is technically impossible to achieve but the idea I had was to get things flat enough that the contact area between the lands of the IHS and cold plate was sufficient to conduct more heat than the same with thermal paste in between. I suspect I was successful but like you I'm waiting for results.

I have no idea what grit size the metal particulates of different thermal pastes are but for the GC Extreme and Kryonaut I've tested it's massive, this makes lapping pointless unless you're shooting for a result that is dead bones flat to the point where use of thermal paste is made either irrelevant or becomes a disadvantage.
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post #19 of 21 (permalink) Old 08-08-2020, 02:20 PM
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Quote: Originally Posted by Simon Penrowe View Post
Not to be mean but your 8000 grit paper got you no closer to a flat surface than your 1500 grit sand paper — or for that matter 120 grit.
Yes, flatness is an ideal that is technically impossible to achieve but the idea I had was to get things flat enough that the contact area between the lands of the IHS and cold plate was sufficient to conduct more heat than the same with thermal paste in between. I suspect I was successful but like you I'm waiting for results.

I have no idea what grit size the metal particulates of different thermal pastes are but for the GC Extreme and Kryonaut I've tested it's massive, this makes lapping pointless unless you're shooting for a result that is dead bones flat to the point where use of thermal paste is made either irrelevant or becomes a disadvantage.
But 8000 grit gave me a hell of a better surface smoothness which also contributes to thermal conductivity as you have less pores for thermal paste to get into.

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post #20 of 21 (permalink) Old 08-10-2020, 09:15 AM
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