What are the differences between apple and IBM processors?

Apple worked with IBM and Motorola to develop the Power PC processors which were a development of IBM's POWER1 processor. Apple used Power PC processors in their range of Macintosh computers between 1994 and 2006 when Apple switched to using the processors from Intel's range. IBM produces a range of processors for all types of devices including the Cell processor used in Sony's PlayStation (The X Box also uses a Power PC processor). (See links below)

In 2008 Apple spent $278 million to acquire PA Semi a company which designs processors based on the Power PC model. It is not known what Apple intends to do with processors designed by the company.