How Intel Laptop Performance & Efficiency Evolved From Nehalem To Broadwell

Last week I published a 7-way Linux laptop comparison with processors ranging from Sandy Bridge to Broadwell. Out of interest from readers in an even larger comparison, I've re-tested a Nehlaem-based "Clarksfield" laptop as well as a "Westmere" laptop to show how the raw performance and performance-per-Watt compare to the Sandy Bridge, Ivy Bridge, Haswell, and Broadwell devices.