lapping

sanding down the cpu until you get to the copper layer changing the grit of the sand paper until the finnished product is a mirror copper finnish, if the cpu heatsink block is also done it makes better contact with the thermal paste dropping the tempretures a little

basicly you are sanding out all the imperfections for smoother contact surface
 
I have to agree .
from an elect and electronic standpoint its a waste of time.
You can clean but for connection it would only eliminate oxidation.
I think the tech world has enough technology now to eliminate this mostly.
it works fine. i would think there might be and many times a sliver of gold or
silver. what ever it is. they coat them and works fine. electronics has come a long ways in the past. you all and most have whip ass components that work well.

ya might take off a little to much. besides being SMT.
 
tremmor said:
I have to agree .
from an elect and electronic standpoint its a waste of time.
You can clean but for connection it would only eliminate oxidation.
I think the tech world has enough technology now to eliminate this mostly.
it works fine. i would think there might be and many times a sliver of gold or
silver. what ever it is. they coat them and works fine. electronics has come a long ways in the past. you all and most have whip ass components that work well.

ya might take off a little to much. besides being SMT.
Click to expand...

Not sure if I properly understand what you are getting at, but I think you are saying that performance wise it makes no difference. That you are right on, it isn't for performance, it is for reducing temperature. You sand it down so more metal of the heatspreader on the CPU touches the metal of the heatsink, as that will give much better thermal conductivity. I know people that have had it from fro 70+ degrees when stress testeing to hitting mid 50s just from lapping it, so it does make a hell of a difference
 
2048Megabytes said:
But if you sand down too much you have destroyed your processor. That makes it not worth trying to me.
Click to expand...

lol yes, +1 :P

however, the other day, I found my old, dead P4 processor (a couple of the pins were bent, and it wouldn't boot anyway) so decided to have a look at what is actually under it, and from seeing the heatspreader, you would have to do a hell of alot of sanding to get down to chip
 
I lapped my 965 Phenom and it dropped temps 10c with a 1.55vcore. I think a person would have to be careless to sand too much..
 
linkin93 said:
if you sand it too much, the IHS on the cpu and the HSF won't make contact. making it useless.
Click to expand...

not really, i eventually removed the heatspreader from my e5200, and had no problems(i did have to remove the cpu retention bracket, though) wasn't really worth the temperature drop for me
 
I don't think sanding too little will ever be an issue...it takes long enough that even the most patient person is ready for it to be over after the fact.
 
Yeah most people it takes 2-4 hours to do it right (breaks in between).

My CPU is flat enough...not enough to warrant lapping plus I always have that fear that I will nuke my $100+ processor. Though I wouldn't mind buying lapped processors depending on how much they charge for it to be done which given how long it takes most would charge quite a bit.
 
i was going to do it but i decided not to... do you lap a CPU and a heatsink? im thinking about buying a cheap pentium 4 and practicing lapping it and its stock cooler till i get the hang of it and then do it to my e8500 because soon it will be oc'd to 3.6 :D

EDIT: to the nay sayer of lapping...
when u have that stock CPU and cooler, its all matte, the surface is riddled with imperfections. when you apply thermal compound and the heatsink those imperfections create air bubble or they dont even contact the heatsink, when that baby is lapped to perfection, aka glossy like a mirror, the surface has no imperfections allowing the heatsink to spread the thermal paste evenly and pushing out all the air. so now certain cores all stay around the same temp and you dont have specifically hot cores or just a generally hot cpu,

Aastii said it perfectly i just wanted to talk about the heat transfer, im bored and my physics final was too easy :/
HAPPY LAPPING!
 
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It took me 20minuntes after I got the materials. I started with 320 then went straight to 1000 it is perfectly flat and smooth but not 100% polished. If you take a new razor blade and vertically scrap it across the top of cpu you will seee the high and low spots in the cpu.
 
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I dunno why intel/AMD dont offer a Lapped version of their processors,for extra cost obviusly but i think they would sell very well....:P

Id do it to my Q6600 and Silent Knight 2 cooler,But i dont realy have the patients :/
 
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