That is a very good idea. Superficially it would be expensive to ship two identical cores at high and low power but an interesting strange idea I came up with

That is a very good idea. Superficially it would be expensive to ship two identical cores at high and low power but an interesting strange idea I came up with is to ship all new cores at high temp, transition all older core designs to low temp, and bond in multiple pieces of silicon. After all, when its cold/off its not doing anything computationally intensive, so the cold core being older/cheaper process wouldn't matter very much. So a CPU with a burned out hot core is still usable as a low performance cold only machine but a CPU with a burned out cold core can only be booted if you hold a match to the heatsink for awhile... that will be an interesting troubleshooting technique for youtube videos.