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.
Xeon Phi
On November 12, 2012, Intel announced two Xeon Phi coprocessor families using the 22 nm process size: the Xeon Phi 3100 and the Xeon Phi 5110P. The Xeon Phi 3100 will be capable of more than 1 teraFLOPS of double precision floating point instructions with 240 Gbit/s memory bandwidth at 300 W. The Xeon Phi 5110P will be capable of 1.01 teraFLOPS of double precision floating point instructions with 320 Gbit/s memory bandwidth at 225 W. The Xeon Phi 7120P will be capable of 1.2 teraFLOPS of double precision floating point instructions with 352 Gbit/s memory bandwidth at 300 W.