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Nic Doye [worldofnic.org] writes:

Facebook have worked closely with Intel to create the new Xeon-D class of CPUs. By eliminating the need for chipsets to deal with two separate, physical CPUs, optimising the CPU for their workload, and reducing the footprint and power of other components, they can achieve better throughput per watt (and per rack) than using 2 CPU servers.

For a reasonably deep description, read more on Facebook's Hardware Blog [facebook.com].

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