We have been spoiled. Since the introduction of the Xeon “Nehalem” 5500 (Xeon 5500, March 2009), Intel has been increasing the core counts of their Xeon CPUs by nearly 50% almost every 18 months. We went from four to six (Xeon 5600) on June 2010. Sandy Bridge (Xeon E5-2600, March 2012) increased the core count to 8. That is only 33% more cores, but each core was substantially faster than the previous generation. Ivy Bridge EP (Xeon E5-2600 v2, launched September 2013) increased the core count from 8 to 12, the Haswell-EP (Xeon E5-2600 v3, sept 2014) surprised with an 18-core flagship SKU.
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https://www.anandtech.com/show/10158/the-intel-xeon-e5-v4-review
