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  Better Cooling by "Lapping" your CPU & Heatsink 
 
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G. G. Aug 27, 2007, 02:54pm EDT Reply - Quote - Report Abuse
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Hey all, take a really good read........ If you want some additional cooling.... do this project by lapping the cpu heatspreader and cooler's base.....

http://www.techarp.com/showarticle.aspx?artno=433&pgno=0

Results tested at load using:

cpu: Q6600 2.44ghz ---> Overclocked to : 3ghz (333fsb x 9 @ 1.2625V vcore) ---> Thermalright Ultra-120 eXtreme cooler.


results = 9~10C drop


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Aug 27, 2007, 03:37pm EDT Reply - Quote - Report Abuse
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>> Re: Better Cooling by "Lapping" your CPU & Heatsink
I thought most everybody here lapped already? I always do anyway, even on my old Athlon XP Barton core, I got about an 8C drop in temps.

CrAsHnBuRnXp Aug 27, 2007, 03:46pm EDT Reply - Quote - Report Abuse
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>> Re: Better Cooling by "Lapping" your CPU & Heatsink
Not worth the trouble for me.

Aug 27, 2007, 04:10pm EDT Reply - Quote - Report Abuse
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>> Re: Better Cooling by "Lapping" your CPU & Heatsink
Neither is getting out of bed in the morning. ^_^

micro Aug 27, 2007, 04:16pm EDT Reply - Quote - Report Abuse
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>> Re: Better Cooling by "Lapping" your CPU & Heatsink
Thanks gg for the post/link.
It may be fun to do sometime. I wonder what % of the drop in temp is from removeing the nickle down to the copper. Though from what i see im sure most of the results come from the flat surface.

The only variable i can see besides what was mentiones, is if he had a slightly thicker or thinner layer of thermal past on between tests.

I had always assumed that the surfaces were flatter from the fatory, but i guess if they had to resurface them there, they would be chargeing more per cpu.

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TamTheBam Aug 27, 2007, 06:05pm EDT Reply - Quote - Report Abuse
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>> Re: Better Cooling by "Lapping" your CPU & Heatsink

They should be true flat anyways. AMD/Intel.... TAKE HEEED!!!

....I'm back, but only as a part-timer... :)
TamTheBam Aug 27, 2007, 06:07pm EDT Reply - Quote - Report Abuse
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>> Re: Better Cooling by "Lapping" your CPU & Heatsink

WHO would like to hire my CNC Mill to get a 0.002 finish on their CPU's??
That's so shiny you can see ur ugly mug init!


....I'm back, but only as a part-timer... :)
Sean Costello Aug 27, 2007, 06:26pm EDT Reply - Quote - Report Abuse
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>> Re: Better Cooling by "Lapping" your CPU & Heatsink
ive known about lapping, just never done it. Mainly cause i dont have any sand paper :)

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FordGT90Concept Aug 27, 2007, 07:05pm EDT Reply - Quote - Report Abuse
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Edited: Aug 27, 2007, 07:05pm EDT

 
>> Re: Better Cooling by "Lapping" your CPU & Heatsink
Grooves help cool. The smaller the grooves, the more surface area, the cooler it runs. When you can't even feel the grooves, the grooves are microscopic: ideal. You don't want a perfectly smooth surface or it won't cool well at all. I'm still waiting for an interlocking processor cap and heatsink so that heat is dispersed deeper into the heatsink.


I've only lapped one heatsink before because the underside was so course, rubbing it would tear the skin.

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phil Aug 27, 2007, 07:49pm EDT Reply - Quote - Report Abuse
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Edited: Aug 27, 2007, 08:07pm EDT

 
>> Re: Better Cooling by "Lapping" your CPU & Heatsink
the problem with lapping at home... well a lot of people just end up sanding the same curve or an even worse curve into the damn chip... and the occasional person gets filings into the underside of the chip

yes intel and amd should put more care into making them flat, but don't just grab some sand paper and go at 'er.

----------------------------------------
tam, leaving your proc with 2thou/inch tolerence isn't worth the effort, just use a 0.01mm microcaliper, machinist level, some cutting oil and a round ceramic wheel stone.

level the wheel stone flat (with level to 10000th/inch) confirm it by rotating it through the microcaliper. map the high/low on the chip with the microcaliper for reference, level the chip against ceramic on the highest point , then apply the oil in the path of contact on the stone as it rotates... 20mins later. you have a chip thats level to .0001/in, instead of .002/in

---
can't access HWA unless I use a proxy... lol

pfft ..f**k that! (almost sounds like work)
TamTheBam Aug 27, 2007, 08:05pm EDT Reply - Quote - Report Abuse
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Edited: Aug 27, 2007, 08:08pm EDT

 
>> Re: Better Cooling by "Lapping" your CPU & Heatsink
You're very clever aren't you ford. I give you a degree in Grooves.

The rougher the finish the bigger the grain. The smoother the finish the smaller the grain.
Not grooves! Less grain = more contact. Big grain = say good bye to ur CPU!

In a nutshell, shiny mirror finish!!

....I'm back, but only as a part-timer... :)
TamTheBam Aug 27, 2007, 08:14pm EDT Reply - Quote - Report Abuse
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Edited: Aug 27, 2007, 08:14pm EDT

 
>> Re: Better Cooling by "Lapping" your CPU & Heatsink
Lol PV i wasn't on about tolerance, i was on about finish and in mm's! lol!

16/
\/ finish

....I'm back, but only as a part-timer... :)
G. G. Aug 27, 2007, 09:23pm EDT Reply - Quote - Report Abuse
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>> Re: Better Cooling by "Lapping" your CPU & Heatsink
Ford,

the only place you want grooves are on the fin side of the heatsink.... more surface area for air to bleed the heat off the heat sink... as for the contact point between the cpu heat spreader and the contact point to the heatsink ... you want no grooves... you want as much contact points as possible. The bigger the contact patch the more area where the heat can transfer into the heatsink to be bled off on the other side. The reason you need thermal paste is to fill in those grooves between the heatsink and the cpu to make contact..... otherwise you have airgaps and those airgaps are a resistance to heat transfer to the heatsink. when you lap, you get rid of those grooves and to make sure the surface is perfectly flat to which both create a bigger contact patch between heatsink and cpu....


Flat and smooth (no grooves) between heatsink and cpu is the way to go... the flatter and smoother the better. That is why there is such a big improvement in the before and after lapping project of that article is all do to making both surfaces as flat and as smooth as possible.

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phil Aug 27, 2007, 10:10pm EDT Reply - Quote - Report Abuse
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>> Re: Better Cooling by "Lapping" your CPU & Heatsink
ford does have a point... you guys are just looking at it differently then what he's saying.

he's saying that if the grooves in the cpu and HS fit together like

/\_/\_/\_/\_/\_/\_/\ hsf
/\_/\_/\_/\_/\_/\_/\ cpu

.. if the grooves lined up, then there would be still 100% contact but much more surface area.... all be it, like 100000000000 to 1 odds to getting that with sandpaper

where i think you guys would be thinking like this:
/\_/\_/\_/\_/\_/\_/\/ hsf
\/\_/\/\/\_/\_/\_/\/\/\ cpu
.. where the grooves don't line up ... reducing contact area.. (this is what you get with sand paper)


.. then theres the mirror and flat finish..

hsf
=============
cpu

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can't access HWA unless I use a proxy... lol

pfft ..f**k that! (almost sounds like work)
FordGT90Concept Aug 27, 2007, 11:42pm EDT Reply - Quote - Report Abuse
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Edited: Aug 28, 2007, 06:52am EDT

 
>> Re: Better Cooling by "Lapping" your CPU & Heatsink
P V got what I was saying. Here's a crude pic:
http://img513.imageshack.us/img513/5692/thermalpinscj9.png

I didn't finish it because Overlord is running minimized. It's too taxing on my poor 4000+. Anywho, that surface in the picture would be either built into the processor cap or the heatsink. There would be a fraction of a millimeter difference between the two to make way for thermal compound. The two sandwich together creating hundreds (if not thousands) of times more surface area cooling much better than any form of cooling can do today. Processor caps like that may start showing up as the core count climbs.

Spikes would probably do better in the way of preventing air bubbles and the whole thing might have to be domed in order to for air from the inside out.


Edit: Whoops, I forgot to mention that it's a two piece set. If the processor has pins sticking out, the heatsink has holes for them to stick in to. Because it would need a lot of thermal paste, I would place a ridge around the processor to catch the excess paste to prevent it from spilling into the socket.

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Sander Sassen Aug 27, 2007, 11:54pm EDT Reply - Quote - Report Abuse
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>> Re: Better Cooling by "Lapping" your CPU & Heatsink
Lapping? What do you think thermal paste is for? Use a very (very!) thin layer to fill out any surface texture on both the heatsink base and the processor die to ensure maximum contact. DIY lapping always results in people making a nice curve onto the processor die, a CNC mill would work for the aluminum or copper heatsink base, wouldn't use it on a processor die though, way too fragile and prone to chip.

Best regards,

Sander Sassen
Editor in Chief - Hardware Analysis
ssassen@hardwareanalysis.com
Aug 28, 2007, 12:01am EDT Reply - Quote - Report Abuse
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Edited: Aug 28, 2007, 12:01am EDT

 
>> Re: Better Cooling by "Lapping" your CPU & Heatsink
I only lap the heatsink itself ... only takes 5-10 minutes and I usually see a 5C drop, so it's worth it to me. :_)

G. G. Aug 28, 2007, 12:16am EDT Reply - Quote - Report Abuse
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>> Re: Better Cooling by "Lapping" your CPU & Heatsink
I would do the hsf side myself.... I'd be too chicken to do it on the cpu side fearing damage to the whole package......

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