Heatsink lapping.

G Thomas Wilson
G Thomas Wilson
Joined: 5 Mar 05
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Topic 188626

Heatsink lapping

I used to liken the behavior to rice burner and Gentoo fanatics.

Out of boredom, I decided to lap an old solid copper heatsink. You know, for kicks. It had deeply grooved machining marks. With it, I generally ran in the mid to upper fifties on this box when crunching and compiling. Used 600, 800 then 1500 grit paper followed by a mirroring with Mother's metal polish. Broke from established tradition and used just run-of-the-mill heatsink compound. I don't buy the whole Arctic Silver thing. It's just heat sink compound, people.. Applied very thin layers on the die contact point and the die itself.

Results? I am running an astonishing ~10 degrees cooler at back-breaking load levels.

I am now a true believer.


Heffed
Heffed
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Heatsink lapping.

> I don't buy the whole Arctic Silver thing. It's just heat sink compound,
> people.
.

You ought to do some experiments with it. Arctic Silver does make a difference. :)

Gary Roberts
Gary Roberts
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> > I don't buy the whole

Message 8831 in response to message 8830

> > I don't buy the whole Arctic Silver thing. It's just heat sink
> compound,
> > people.
.
>
> You ought to do some experiments with it. Arctic Silver does make a
> difference. :)

Although I use Arctic Silver myself and will continue to do so because it does do a good job of spreading very thinly, not drying out, and is very easy to apply, I don't think it makes much of a difference to the thermal transfer. I think that lapping as described in the original post is far more important. If you want a very illuminating read on tests of various compounds (and various spoof items), look at this review. Its an extremely entertaining read, as is most of the stuff on this site, and here is a quick summary of results. First of all a direct quote of the experimental method:-


By monitoring the voltage across the heater's 4.7 ohm power resistor I can tell how much heat it's outputting. And with a dual-input thermometer that lets me see the ambient air temperature, the temperature of the probe inside the heater, and the difference between the two (delta-T), I can tell how well the cooler's managing to get rid of the heater's output, without the result being polluted by changes in the ambient temperature.

Divide the delta-T by the heater wattage, and you get a number in degrees Celsius per watt (°C/W). The lower the number, the better.

I've listed the actual numbers that are reported in the article:-

01. No thermal compound at all. -----------------------------> 0.66°C/W
02. Zinc Oxide thermal compound. --------------------------> 0.50°C/W
03. Arctic Silver 3 thick layer. ---------------------------------> 0.50°C/W
04. Arctic Silver 3 thin layer. ----------------------------------> 0.48°C/W
05. Arctic Alumina thin layer ----------------------------------> 0.50°C/W
06. Cooler Master's gold-tube, grey-grease PTK-001. ---> 0.50°C/W
07. Cooler Master HTK-001 (white grease) ----------------> 0.50°C/W
08. Nanotherm thermal compound (2 days bed-in) ------> 0.50°C/W
09. Toothpaste (yes, read the full article). -----------------> 0.47°C/W
10. Vegemite (an Australian thing - yeast extract) -------> 0.48°C/W
11. Straight water (yes, read the full article) --------------> 0.41°C/W

It's really wierd that both toothpaste and Vegemite are as good as or better than AS3, for the short period of the test anyway.

There's a lot of interesting and useful stuff on this guy's site.

Cheers,
Gary.

lanceman
lanceman
Joined: 16 Mar 05
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Hey now, not all of us that

Hey now, not all of us that use Gentoo are ricers. Of course I'm not a ricer, I just learned to overclock from my dad on the old trusty i286, the first heatsink I lapped was on the K6-233 so it run stable at 289. Who didn't overclock the PS/2 port for better performance in Quake?

Hmm, maybe I am a ricer :(

G Thomas Wilson
G Thomas Wilson
Joined: 5 Mar 05
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> I just learned to overclock

Message 8833 in response to message 8832

> I just learned to overclock from my dad on the old trusty i286

The only mod I ever did to my 286 was to add a 1:1 interleave MFM-controller. Thought I was living in the fast lane. (Ack! I'm getting old!)

> Hmm, maybe I am a ricer :(

Only if you install rear spoilers on a front-wheel-drive import.


lysdexia
lysdexia
Joined: 9 Mar 05
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Does gelatin act weird?

Does gelatin act weird?


"My other computer is a virus farm."

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