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Is this corrosion or what? Should I lap it or not? - Nickel plated copper curse - Prolimatech Megahalems - Page 2

post #11 of 29
Scratches/divots of that size in that location aren't likely to do anything to cooling performance, but they may scratch the IHS of the CPU you mount it to, which while also cosmetic, could possibly cause issues if you needed to RMA one.
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post #12 of 29
Thermal Grizzly Kryonaut is a better conventional paste than GC-Extreme
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post #13 of 29
Quote:
Originally Posted by Blameless View Post

Scratches/divots of that size in that location aren't likely to do anything to cooling performance, but they may scratch the IHS of the CPU you mount it to, which while also cosmetic, could possibly cause issues if you needed to RMA one.
Which was the reason I said to sand / file / diamond file them smooth with surface. of cooler base. tongue.gif
post #14 of 29
Thread Starter 
Alright, so tomorrow I will try to get rid of just the "scratches". If I will manage to botch it, I'll just do full lapping of the whole base.

What do you mean by very fine paper? I currently have only 220, 400, 800 and 1500 at my disposal, but tommorow I will probably go buy some more grits.
post #15 of 29
Quote:
Originally Posted by Amynue View Post

Alright, so tomorrow I will try to get rid of just the "scratches". If I will manage to botch it, I'll just do full lapping of the whole base.

What do you mean by very fine paper? I currently have only 220, 400, 800 and 1500 at my disposal, but tommorow I will probably go buy some more grits.
I would probably use 800 grit.

With many Intel CPUs, the IHS is concave and almost all cooler bases are now convex. If you lap the cooler base it will be flat. If your IHS is convex, the cooler base will no longer have direct contact against center area of IHS / CPU chip. This means the CPU IHS has to be lapped flat too or you will not have good cooling. Last inage in the link below shows flat vs convex contacts.


But if you read the "Ways to Better Coolng" link I gave you earlier you should know this.
post #16 of 29
Quote:
Originally Posted by Amynue View Post

Alright, so tomorrow I will try to get rid of just the "scratches". If I will manage to botch it, I'll just do full lapping of the whole base.

What do you mean by very fine paper? I currently have only 220, 400, 800 and 1500 at my disposal, but tommorow I will probably go buy some more grits.

i'd start with 800 to get the "peaks" sanded down, then you can wet sand to a fine finish with the 1500. i don't think you actually need to use 2000 grit since you aren't doing a full lap and you don't really need that pretty mirror finish you get from 2000 grit. all you need is a smooth surface w/o the peaks made by the scratches. valleys are fine since it's not actually making too much difference and the TIM will do it's job. it's the peaks that will cause the TIM to be spread unevenly and cause problems. a 1500 is already going to give you are pretty glossy finish, just not like a perfect mirror finish if you go up to 2000 grit.
post #17 of 29
Thread Starter 
Turns out I had 600 grit paper, not 800. I've decided to not only get rid of the peaks, but also the holes, sadly they were deeper than I've expected and it was taking ages to sand that down with 600 grit. In the end there are still two tiny holes left, but I ran out of paper so I'll let them be. I was also doing my best not to destroy the natural convex of the base and I think I did very well as you can see at the end of the album:

http://imgur.com/a/w5ixp

Tomorrow I will go buy 800 and 1000/1200 grit papers to get rid of the light scratches and give it some shine. I'm not sure if I'm going to go as far as 1500. I did some research back at the time when I was lapping my Mugen 2 and from what I've gathered there is not much of a difference in performance beyond 800 grit.
post #18 of 29
correct. performance wise, there is very little difference between a 800 and a 2000. it's more of a "pretty" factor biggrin.gif

the key is to have a flat surface. neither convex or concave are good for TIM application since they just reduce the actual contact area and end up needing more TIM for complete coverage. obviously this also applies to the IHS of the CPU. but it's up to you whether you want to risk lapping that. there is more risk involved since micro metallic dust can work its way into the chip and it's just risky
post #19 of 29
Quote:
Originally Posted by psyclum View Post

correct. performance wise, there is very little difference between a 800 and a 2000. it's more of a "pretty" factor biggrin.gif

the key is to have a flat surface. neither convex or concave are good for TIM application since they just reduce the actual contact area and end up needing more TIM for complete coverage. obviously this also applies to the IHS of the CPU. but it's up to you whether you want to risk lapping that. there is more risk involved since micro metallic dust can work its way into the chip and it's just risky

Sorry, but no.
The key is not flat surface.
The key is to have matching surfaces to give us as much direct metal to metal contact between cooler base over CPU chip area of IHS.
Flat surface to flat surface, convex to concave, etc are all matching surfaces. Convex cooler base to flat surface IHS is not matching surface and is a problem because most CPU chips (where heat comes from) are in middle part of IHS. Flat cooler to concave IHS is not good because there is a gap between cooler and IHS that must be fill with TIM and TIM transfers very poorly compared to direct metal to metal.

The key is get as much metal to metal contact over the CPU chip. Red is hottest with heat becoming less the farther away from heat source (chip) it radiates. The IHS is not very thick so does not radiate heat very far from chip.

If IHS edges are higher than center (often they are on Intel chips) lapping the cooler flat without also lapping CPU IHS will make things hotter.
See post #15 above for visual of above explanation and more.
post #20 of 29
matching surface is pretty much "impossible" since the concave IHS surface you are referring to is a manufacturing defect... not all IHS are concave, and not all concave IHS are symmetrical in their defect. if you go down the line of thinking that "most intel IHS are concave" then are you going to take into account how unevenly they are concave relative to the center of the chip where the silicon is residing? are you going to design a heatsink based on that offset concave structure you find on a particular IHS?

the only way we can discuss this is through flat surface because when it all comes down to it, you can lap both the IHS and the heatsink so that they do in fact have matching flat surface...

here is an example of an IHS that is not exactly symmetrical



as a heatsink manufacture are you going to match the contact surface of your heatsink to this surface? or another IHS that is actually convex? it's a manufacturing defect you can't argue one way or another, So we can only discuss flat surface because ultimately if you want to go through the trouble of lapping both the heatsink and the IHS then you have a "matching surface"

as far as heat being produced in the middle of the chip... yes that is a fact but there is also a reason why they put an IHS on the chip. it spread the heat out so that more contact surface can be used to remove the heat. the key here is MORE contact surface. after all you can remove more heat with 6.25cm2 then 2cm2 of contact surface... if you have a convex heatsink on a flat IHS then you'd end up with just 2cm2 of contact surface rather then the whole 6.25cm2 contact surface on the same 88w thermal load...

so yes the "argument" for flat surface is VALID since it's the only actual controllable environment that end users have when it comes do dealing with manufacturing defects like what you are talking about.... you CAN lap both the heatsink and IHS so that's the ONLY "matching surface" we can talk about..... any discussion of matching convex to concave is a waste of time because neither intel nor heatsink manufacture are going to have a "matching specification" as to what kind of manufacturing defect they are going to have.... "most intel IHS are concave" is not going to cut it in a discussion since "his" IHS may very well be convex since we are talking about a manufacturing defect...
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