Lapping a CPU

Lapping a CPU

10:24 07 May in How-to
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lapping a cpuThe art of CPU lapping, especially the Celeron, has been a well known secret for most overclockers. The main aim for doing this procedure is to get better heat transfer between the hestsink and the processor, thus a cooler CPU temp. By sanding the nickel layer off the CPU core, we are exposing the copper layer which we all know is the best medium when it comes to heat transfer.

A lot of sites have a how-to on doing this procedure but most uses a Socket 370 based Celeron. This time you’ll see it done in both Socket 370 and Slot 1 fashion. I know there’s not much difference but for the sake of request, it will be done both ways.
intel celeron slot processorintel celeron

Processor Lapping: Necessary Materials

Sanding Paper 260, 600, 800, 1200 grit
Sanding Block
Anti-static Bag
Masking Tape
Scotch Tape
Piece of Cloth/ Foam
Blade/ Cutter

CPU Lapping: Procedure

1.Mask the area around the core with masking tape, making sure that the core is the only area exposed.

2.Insert the CPU inside the antistatic bag. Fold it into the shape of the Celeron, then seal it with scotch tape.
antistatic bag

3. Using a blade, carefully cut out the shape of the core from the antistatic bag enclosure to expose the area to be lapped. Again seal the edges of the open exposed area with scotch tape.

4.Prepare the sand block by cutting a piece of sand paper and form it around the shape of the block. Use the sand paper according to this order of grits: 260, 600, 800, and 1200 (you can use higher grits, but for me, this did the trick and I achieved the outcome I wanted).

Lapping a CPU: Here Comes the Sanding

wet sanding
Wet the area to be sanded with a piece of damp cloth or foam (Wet Sanding). Then start sanding. Use one hand to hold the CPU then sand with the other hand using an up and down or back and forth motion. If you don’t have a sanding block, place the CPU on a flat surface then sand it using a figure of 8 motion. Occasionally wet the core area with the foam then proceed again with sanding. Changing of sandpaper grits depends on how the sanded area looks. So for a guide here are the pics of the core at the end of each sanding grit.

And here’s the final result of the CPU lapping:
processor lapping

Before doing this I thought most OC sites already have a lapping howto, but then I thought again, so why should our site be an exception? A bit late for some but still a guide to our newbies who like to experiment.

BE WARNED THOUGH THAT YOU CAN ONLY SAND UP TO A CERTAIN LEVEL. DON’T OVERDO IT. AS LONG AS THE NICKEL IS GONE AND THE CORE SURFACE IS FLAT, ITS FINE!

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