The HP Z640 supports two Intel Xeon E5-2600v3 and E5-2600v4 series processors. The Hyper-Threading support allows two threads to run simultaneously on each core -- Windows recognizes 44 total cores on the Z640, 22 real and 44 virtual. It also supports "Turbo Boost" which automatically boosts the processor speed based on workload - so if an application is only using one of the 44 cores it will automatically increase the speed of the core in use and turn off the unused cores.
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