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I lapped my P4

C

caboob

Platinum Member
So I lapped my trusty 2.66B according to this article and was able to knock off 5C off my load temps and run my CPU at 3.00 at default voltage where before it needed 1.65V. Anybody else tried this?
 
looks sweet db, what grade of sandpaper did you finish with. all I could find at my local hardware store was 600 grit and none finer. but hey it works.
 
Originally posted by: caboob
looks sweet db, what grade of sandpaper did you finish with. all I could find at my local hardware store was 600 grit and none finer. but hey it works.
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I would recommend auto parts stores for finding the really fine sandpaper. It's commonly used on car finishes after painting. Most blocks of pine and oak don't need such a fine paper because of the thickness of wood particles.

techfuzz
 
Originally posted by: dbwillis
Yes, Ive done it on my APLHA and my 1.8A as well ay my 2.0A and 2.4B
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works of art i tell ya 😀
i bet that cpu will stick to the HSF w/o paste! :Q

arent you suppsed to lap the cpu down to pure copper tho?
or is that untrue?
 
after i lapped my 1.6a, i could have shaved with it. you don't necessarily have to go to the copper, as long as it is perfectly flat. in my case, i had to go all the way to the copper. i started with 600 grit and worked my way to 2000, and i then buffed it with the back of the paper. i bought the wet dry paper at an auto store.
 
I sanded down to the copper layer but only because the IHS was concave! Will be seeing what the ceiling is on this lapped CPU tonight.
 
Yes, I sanded them all down to the copper..and then some.
The IHS is about as thick as a penny..so you dont have to worry about sanding too far.

Yes, they stick together very well and with little paste..I still like the 2.4B I use now thats got no IHS on it, only a lapped penny, circa 1965...its hard to find a full copper penny!
 
oops.
I use these grades, I get them at the auto paint store:>

320
400
400 wet
600
600 wet

then I use some Mothers polish and go over it with some cotton cloth for the high shine (had lots of practice...LINKY)
 
I got the IHS off like this:>

Put the CPU on its side near the edge of the desk..then used an exacto knife and started from the top corner of the cpu towards the middle, using the desk as a leverage point to keep me (and the knife) from slipping..repeated on all 4 corners, then turned the cpu around so the pins are on the other side and repeated the knife leverage thingy...this sliced all 4 sides all the way around...the IHS wiggled off with a wee twist after that....cleaned the cpu up and popped it back in, no problems here
 
kewl 😎
thats exactly what i had in mind but wanted to hear it from the "experienced" 😉
im gonna do this on my next chip ~ direct contact! 😀
 
Originally posted by: dbwillis
I got the IHS off like this:>

Put the CPU on its side near the edge of the desk..then used an exacto knife and started from the top corner of the cpu towards the middle, using the desk as a leverage point to keep me (and the knife) from slipping..repeated on all 4 corners, then turned the cpu around so the pins are on the other side and repeated the knife leverage thingy...this sliced all 4 sides all the way around...the IHS wiggled off with a wee twist after that....cleaned the cpu up and popped it back in, no problems here
Click to expand...

I think I better try that with a cheapo celeron before I commit to a $250 cpu upgrade in the future.
 
600 grit is way too harsh to finish with, walmart sells a lot of different grit, 600, 800, 1000, 1200, 1500, 2000. personally i finish with 2000 and is extremely smooth/reflective 😀 cheers.
 
He didnt finish with the 600grit he said he finished with mothers's polish. That polish should be like 1500 or above grit.
 
Beware of using polish. Some use a UV protectant that is counter-productive to heat transfer. Instead use some high-grit sandpaper. When I lapped my Alpha I went up to 2000 grit sandpaper. The result was almost as nice as polished. 🙂
 
Got the Celeron on order 🙂

It will not OC far though. It is of the 1.7GHz flavor. But more than edequate for testing of the removal. For $55+shipping I really am not out any money though should it fail.

eta, 7-10 business days.
 
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