X1000 CPU is PWRficient PA6T

[mongo]

Apple bought PASemi, who designed the PWRFicient, but PASemi were a fabless company. I don't recall off the top of my head who was responsible for fabrication, but when buying the company, it would seem reasonable that Apple would have to honour any existing production contracts PASemi / their fabrication partner may have had at the time.

Yup.

http://www.theregister.co.uk/2008/05/16/pasemi_apple_support/