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Old March 5, 2008, 06:40 PM
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Default Lapping, Pros & Cons, difficulty

Ok so before looking into Ocing and joining HWC I had never even heard of Lapping.

It has me very intrigued.

So as the subject suggests what are the,

Pros:

Cons:

How difficult is it? Seems easy enough.

Does anyone have a nightmare story?

Is it easy to destroy the CPU?

Is it really worth it?

I am going to try it just to see how shiny I can get my BROKEN PIN 4200+, no worries there, can't hurt what is already broken. After that if it is actually worth it I will consider lapping my current 3500+.

After that if it is really easy, beneficial and recommended I will go after my E8400. The E8400, however, has me concerned as it is so much smaller and thinner than my AMD chips. I would guess a much smaller margin for error.
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Old March 5, 2008, 06:42 PM
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Since the E8400s run fairly cool, I'm not sure you'd see too much benefit from it.

I'd only consider it if the cores were wildly differing temps which would suggest that it was warped.

The cooler on the other hand.......... :)
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Old March 5, 2008, 07:03 PM
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I held a razor blade across the E8400 tonight and looked for light. Not a glimmer, which suggests that the CPU is very flat.


Oh yes the after market Thermalright Ultra 120 heat sink will be done. When I get one...
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Old March 6, 2008, 09:14 AM
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Pros: Very minor drop in temp
Cons: No warranty
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Old March 6, 2008, 04:52 PM
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Lapping is pretty easy. Flat is what matters, not shiny... though shiny is good for the ego. A long while back I read an article that suggested that a perfectly polished surface was not as good as a surface that had some "micro" texture. It made sense but TBH I think you'd have to look real hard with some pretty accurate equipment to see any difference.

As for if it'll make any difference or not, well that is on a case by case basis. In most cases it will net you a very small decrease in temps but whether the degree or three you get is worth all the fuss is a question only you can answer. There are those oddball chips that have a IHS that more resembles a dinner plate that would benefit to a greater extent by lapping.
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Old March 6, 2008, 04:58 PM
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I figure might as well Lapp. It is very simple, and is not going to make your temps worse. The cheaper CPU's usually have the worse surfaces, my E1200 Celeron had a TERRIBLE top. I lapped it and it is extremely flat now. For the $3 that the sandpaper costs, you might as well Lapp!
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Old March 6, 2008, 07:46 PM
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Default My Lapped 4200+ Trial

Well I have a 4200+ sitting around with 2 broken pins so I had noting to loose and gained experience. Picked up my series of papper at Crappy Tire today.

So here came the paper:

220 grit - 320 - 400 - 500 - 600 - 800 - 1000 - 1500 - 2000

I did not find and polishing compund, actually I only wanted one " Jewelers Rouge" as it is what Jewelers use to polish precious metals and is of the finest grit compounds.

In any case even without it I had very good results and it was all done in about 3 hrs.


Before starting I took some measurements wit a digital vernier caliper to get an Idea of the deformities of the chip. Mind you with the AMD64 chip the pins got in the way and may have caused some inaccurate readings.
Being as careful as possible the measurements I took varied from .257" - .263" whish equates to a .006" variance from high to low spots. Thats a lot. light could easily be seen under a ruler or razor blade.
After the lapping my measurments went down to .255" - .257" a difference of only .002".

Now since I can actually use the chip and see the reduction in temp, I am only left with the ego boost. pretty good I think, can't wait till I get the jewelers rough for the final polish results.

Here are the results so far:

After one swipe on the 200 Grit I decided to take some pics
Attached Images
                   
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Last edited by CasheKicker; March 6, 2008 at 07:52 PM.
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Old March 6, 2008, 08:01 PM
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Nice job!!!

Wanna do my e6420???? :)
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Old March 6, 2008, 08:03 PM
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Sure, I am ready to go.

Still want to do the rouge, but thats just overkill. hehehehe, need all the Ego I can get from after I was dumb enough to break the pins off the CPU 2 days after I bought it. DUh

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Old March 6, 2008, 08:12 PM
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Rouge would probably be a bad idea anywise......

AFAIK it'd just add an oil to the mix which would need to be removed for proper application of the tim.

A mirror finish is just for looks anywise.... flatness is what you're looking for.
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