Xeon
Introduced in May 2013, Xeon E3-12xx v3 is the first Xeon series based on the Haswell microarchitecture. It uses the new LGA 1150 socket, which was introduced with the desktop Core i5/i7 Haswell processors, incompatible with the LGA 1155 that was used in Xeon E3 and E3 v2. As before, the main difference between the desktop and server versions is added support for ECC memory in the Xeon-branded parts. The main benefit of the new microarchitecture is better power efficiency.
Mac Pro
The first-generation Mac Pro has a rectangular tower case which outwardly resembles the last version of the Power Mac G5, and has similar expansion capabilities. The first Mac Pro offered a dual Dual-core Xeon Woodcrest processor. It was replaced by a dual Quad-core Xeon Clovertown model on April 4, 2007, and again on January 8, 2008 by a dual Quad-core Xeon Harpertown model. The 2012 Mac Pro is nearly identical to a model that was announced on July 27, 2010. It features Nehalem/Westmere architecture Intel Xeon processors. These CPUs offer optionally twelve processing cores. The machine itself at its most evolved is able to accommodate up to four 2 TB hard disk drives or 512 GB solid state drives, as well as the ATI Radeon HD 5770/5870 GPU units, one per slot.