With Ivy Bridge-E, Intel is finally moving their enthusiast CPUs to their newer 22nm manufacturing process. While this does not greatly increase the raw frequency that the CPUs are able to run at, it does allow them to draw less power while doing so. In addition to the smaller manufacturing process, the new line also has more L2 cache per core and improved memory support.
Technology Primer: Intel Haswell Desktop CPUs
Haswell is the codename for Intel’s 4th generation of processors and is the “tock” in Intel’s “tick-tock” development cycle. This means that it uses the same 22nm process as Ivy Bridge, but includes a different mounting socket and many refinements to the chip’s architecture.