lapping

homi-sid-al

homi-sid-al

homi-sid-al

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Joined
15 Nov 2007
Posts
476
hi guys,i am thinking of lapping my akasa evo blue cooler and was wondering if the same process can be used on the actual cpu?if so how do i do this without killing it?,my q6600 is oc'd to 3ghz and running idle at 49c and running into high fiftys under load.also once i get the required finnish on the heatsink would it be worth using a cutting paste to hopefully get a better finnish?.also im using this cooler on the striker extreme m/b and had to litterally dismantle the cooler to attach it to the board due to the rediculously large heat pipe affair on the m/b,anyone got any tips on attaching this particular cooler to this m/b?i found it difficult to judge how tight the bolts were because of the lack of finger space if that makes sence.
 
yeah lapping the CPU is quite popular and will indeed lower temps. It's usually done with sandpaper laid on a flat surface and you use increasing grades. I go from 400 grit to 2500 grit.

I lap ALL my cpus :D here's my old e6400


img2908ld3.jpg
 
Have you checked to see if the cooler isn't flat? It's more likely that the CPU won't be flat.

Also how much thermal paste did you put on the CPU? Too much would raise the temps.
 
there could well be to much paste to be honest,i usually put a dab in the middle but i remounted it the otherday and noticed the paste wasnt covering the whole of the cpu,im gonna buff these babys up the weekend so those temps shouldnt be a prob till then should they?.....BTW thats a shiny cpu:eek:
 
sammie377 said:
Be careful a shiny cpu is not always a flat cpu, flat is WAY more important than shiny.
Click to expand...

im gonna use a stanley blade to ensure a flat surface,just out of interest is it normal for a cpu to have a concaved surface?and how far can i safely go with the buffing?dont get me wrong i aint about to take a sander to it but it would be nice to know im gonna be relatively safe:)
 
this info may also help you

http://thetechrepository.com/showthread.php?t=71


Taken form weescotts article http://forums.overclockers.co.uk/showthread.php?t=17803239

"To check the final flatness, hold the CPU (or waterblock etc) at 90 degrees to your monitor whilst displaying this file, with the edge of the IHS on the center line. The reflected lines should continue smoothly with no wobbles or distortions: http://www.thermochill.com/guides/LappingGrid.pdf (zoom it in a bit too)
A mirror finish is NOT required to get it to reflect. Even a rough block will reflect the image on the monitor at the correct angle".
 
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great guide,didnt realise just how uneven they are,silly question though theres no way it would be so uneven that you could create a hole is there?i have no idea how thick the plating is so im just thinking of potential dissasters;)also would i still need to apply thurmal paste?it didnt say in the guide,i will be doing both the processor and heatsink.
 
homi-sid-al said:
Snip

question though theres no way it would be so uneven that you could create a hole is there?also would i still need to apply thurmal paste?it didnt say in the guide,i will be doing both the processor and heatsink.
Click to expand...

When you lapping you need to remove the nickel plate first. (800grit)

After removing all of the nickel you need to work on the base to attain an evenness. (Do not apply pressure allow the weight of the processor to do the work)

Using a black felt tip permant marker draw a criss cross diagram (Union jack)from each corner, middle on the of the cpu.

As you lapp check the base. Complete removal of the maker will indicate the base is flat. Then move on to he next grade of paper and do the same (union jack)

You wont make a hole, nor will you enter the (CPU CHIP) so dont worry.

Apply the same method to your heat sink.

After you have lapped both. Apply a very thin layer of artic silver approx half the size of a grain of rice.

Clean the CPU and heat sink throughly with Isopropyl alcohol before applying the TIM.
 
homi-sid-al said:
im gonna use a stanley blade to ensure a flat surface,just out of interest is it normal for a cpu to have a concaved surface?and how far can i safely go with the buffing?dont get me wrong i aint about to take a sander to it but it would be nice to know im gonna be relatively safe:)
Click to expand...

You won't go through they are 2-3mm thick you'd be rubbing till Xmas:D
 
I've done quite a few of my cpus now, try and do it on a glass table top if poss.

I found that my temps dropped by approx 3-5*c, but more importantly it equaled the temps accross the cores.
 
all done:Di had way to much paste on:rolleyes:anyway did the processor and heatsink and ive dropped 9 degrees C:pand my core temp readings are all the same when before there were big differances between each core so im taking that as a good sign,thanks for the help with this guys it was well worth doing:)
 
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