Defining value is difficult when it comes to Intel's X99 platform, in part because the company designed it for professionals and performance enthusiasts. Compared to Intel’s highest-end mainstream processors, Haswell-E offers more cores at lower clock rates. That sounds like a recipe for reduced value in most applications, but there’s a catch. Haswell-E also has a 40-lane PCIe 3.0 controller.
Or does it? Of the available LGA 2011-v3 processors, the Core i7-5820K comes closest to the cost of Intel's Core i7-4790K, the highest-end Haswell part you can buy. The -5820K's frequency is 25% slower and it has 12 of its PCIe 3.0 lanes disabled. Yet, even with its lower clock rate and reduced PCIe lane count, this entry-level Haswell-E chip keeps its high-end label by wielding six potent cores. Oh, and then there’s the native support for three-way SLI.