In a post on the forum, user GtiJason pointed us to an article on servethehome.com detailing the significant drop in price of the Xeon E5-2670 V1 processor. The Xeon E5-2670 is an eight-core Sandy Bridge-EP based processor which launched in March 2012 at a clock frequency of 2.6GHz. The launch price of the CPU was around USD $1500.
The price of the latest version of this SKU is the Xeon E5-2670 V3 based on the Haswell architecture and boasts 12 cores at a frequency of 2.3 GHz. The drop in price from USD 1500 at launch to USD $300 in September is not coming as a surprise as Sandy Bridge-EP is two generations older than Haswell-EP, but a price drop of 50% in less than two months certainly is. According to servethehome.com, the steep decline in price is due to the many thousands of processors hitting the second-hand market as Facebook decommissioned server equipment. It's interesting to see the impact of a large corporation like Facebook on the second-hand market for server processors.