Quote Originally Posted by RaV666 View Post
AMD always made same dies for desktop/server cpus, and differentiated both by disabling/enabling parts of it,packaging and testing, but most importantly masks on which they were made were the same.
The word "always" is very dangerous word to use because it paints you into a corner.

I happen to know the differences between the parts. If I run out of Lisbon parts I can't put a Thuban die in a C32 package and sell it as a Lisbon. And if I run out of Istanbul I REALLY cannot put a Thuban die in a socket F1207 package.

Physically the dies may fit, but there are logic level changes between each of those dies. Each of the three is a different stepping, Istanbul is D0, Lisbon is D1 and Thuban is E0.