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Cathar · 01-14-2003, 06:26 AM

I can say with 100% certainty that the AMD CPU markings are engraved/etched into the surface of the due. That is, they are concave.

Think about it. From a manufacturing point of view, what's easier? Have a flat surface and laser etch some thing onto it. Or have a flat surface and remove everything but that which you want there (the writing) and drop everything else down to a uniform depth.

The second approach is silly. The markings are not raised.

I've lapped AMD CPU dies before (don't bother - no point). However, while doing so with 1200-grit paper, I noticed that the color sheen was first to go, revealing the bare silicon color of the die. Then very slowly the edges of the writing started to go, and then was left with just the deeper middle portions of the markings, and then upon further lapping, they too disappeared.

01-14-2003, 06:26 AM	#49
Cathar Thermophile Join Date: Sep 2002 Location: Melbourne, Australia Posts: 2,538	I can say with 100% certainty that the AMD CPU markings are engraved/etched into the surface of the due. That is, they are concave. Think about it. From a manufacturing point of view, what's easier? Have a flat surface and laser etch some thing onto it. Or have a flat surface and remove everything but that which you want there (the writing) and drop everything else down to a uniform depth. The second approach is silly. The markings are not raised. I've lapped AMD CPU dies before (don't bother - no point). However, while doing so with 1200-grit paper, I noticed that the color sheen was first to go, revealing the bare silicon color of the die. Then very slowly the edges of the writing started to go, and then was left with just the deeper middle portions of the markings, and then upon further lapping, they too disappeared.