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.
Victim cache
Processor performance and frequency has grown rapidly over the past three decades. Post mid-1980's it has grown by 52% annually largely driven by organisational and architectural ideas. 64-bit Intel Xeon processor (2004) can clock at 3.6 GHz thus having a cycle time of 0.27 ns. Memory cycle time however has not grown at this fast rate. This has resulted in processor cycle times being currently much faster than memory cycle times, and the trend has been for this gap to increase over time. The problem of increasing memory latency, relative to processor speed, has been dealt with by adding high speed cache memory.