Anandtech published The Intel Haswell-E CPU: Core i7-5960X, i7-5930K and i7-5820K Tested
A quote from the article:
Today marks the release of Intel's latest update to its Extreme processor line with a trio of Haswell-E models including Intel's first consumer socketed 8-core product. This is the update from Ivy Bridge-E, which includes an IPC increase, a new X99 chipset, the first consumer platform with DDR4 memory, and a new CPU socket that is not backwards compatible. We managed to get all three CPUs ahead of launch to test.The Intel Haswell-E CPU Review: Core i7-5960X, i7-5930K and i7-5820K Tested @ Anandtech