Although it is doubtful Apple will use a -E processor in a Mac Pro, the -E models tend to very closely track what is now the Xeon E5 1600 series (formerly the Xeon 3x00 class series ). (Basically the same design with some features flipped on/off to differentiate the two on the market. ) The lasted leaked news is likely just primarily a clock speed bump with minor architecture improvements. http://www.cpu-world.com/news_2012/2012110102_Features_of_Ivy_Bridge-E_processors.html Number of cores -- the same ( Yes, there will be 4 core workstations. ) L3 cache -- the same ( side effect of number of cores since cache/cores come in same layer cake increments. ) Technologies -- the same Instructions -- mostly the same some minor short float bump. Memory -- mostly the same ( clock bump just like the cores ) PCI-e -- different ( but Xeon E5 are already at PCI-e v3.0, nothing new here for Mac Pro ) TDP -- the same So all the hand waving that Apple is waiting on Ivy Bridge Xeon E5 for new Mac Pro because it is going to be revolutionarily different ....... not evidenced at all. A Sandy Bridge Xeon E5 Mac Pro in 2013 is going to perform alot like a Ivy Bridge Xeon E5 Mac Pro in 2013-2014. Incrementally faster, but not a large jump. Especially the single package models. The only large gap will be in the mid-to-upper end of the dual package models and only on software that scales linearly. There is a chance the Xeon E5 1600 line might top out at 8 instead of 6 but it doesn't look likely at the price points that Apple would likely use (given Intel's track record on pricing).