Apple's latest 8-core Mac Pros use a special version of the Intel Xeon workstation processor that isn't yet available to other computer manufacturers.

An eWeek report confirms the news, claiming the new 3GHz chip at the heart of the fastest system is an unannounced model from the top of Intel's Xeon range – the Xeon X5365 – a model that is only used by Apple.

"We are indeed shipping a 3.0GHz Xeon version [and] expect to see faster gigahertz speeds for our high-end [Core 2] Extreme PCs very soon, too," said Intel's Bill Kircos.

"For now, the product is in limited production and Apple has chosen to adopt it. We will introduce another 3.0GHz Xeon SKU later on as well," he added.