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How do YOU lap?

T

TalonFyre

Member
The only way I've heard to lap a CPU is to tape the edges and bottom, turn it upside down, place two fingers on either side of the die, and start a circular (or was it linear?) motion against 800/1000 grit sandpaper which is against a flat pane of glass. Diluted/Dionized water on the sandpaper too, I think. Any other methods out there?
 
I'd suggest putting your finger dead-center on the CPU. If the CPU in question has a metal heatspreader over the core, then starting with something like 400-600 grit to establish flatness may help speed things up, too.
 
What kind of processor are we talking here? If it's an Athlon or something with a bare core, lapping could also easily result in a dead processor.
 
Oh sorry, I was talking about Intel chips P3/P4. Hmm...I didn't know lapping an AMD cpu could kill it. How much lapping would that take?
 
If you do a little research on the Intel site about the P4 processor package you'll see that the surface flatness spec for the IHS (.0001"). This is significantly finer than you'll get with 900 grit wet dry sandpaper. If you lap the IHS with this sandpaper you'll make the finish less flat and thus create a worse thermal transfer surface.

IMO, if you must lap, concentrate on the heat sink.
 
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