The PA6T lines differed in L2 cache size, memory controllers, communication functionality, and cryptography offloading features.

[1] The PA6T is the first Power ISA core designed from scratch in the previous ten years outside the AIM alliance, which included IBM, Motorola, Freescale, and Apple Inc.

[1] PWRficient processors were initially shipped to select customers in February 2007 and were released worldwide in Q4 2007.

Semi was bought by Apple Inc. in April 2008,[3] and closed development of PWRficient architecture processors.

However, it will continue to manufacture, sell, and support these components for the foreseeable future due to an agreement with the US Government for some military applications.