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Missing CPUs on HP DL580 Gen8

Missing CPUs on HP DL580 Gen8

Missing CPUs on HP DL580 Gen8

About a year ago we purchased two identical servers. They were shipped together and installed at the same time. They have the following specs...
  • Windows Server 2012 R2
  • HP DL580 Gen8
  • 4 x Intel Xeon CPU E7-4820 v2 @ 2.00GHz
  • 512 GB Memory
Each Xeon has eight cores. Times the four processors is 32 cores. With hyperthreading gives me 64 logical processors. Each machine when running healthy does show 64 logical processors.

This was working fine until a couple months ago. One of the machines was rebooted and since then has been showing only four cores (8 logical processors), which is half of a processor.

The system seems healthy otherwise, and gives no helpful errors or warnings in the event logs. I've gone through the HP troubleshooting and configuration docs and don't see anything helpful.

Does anyone have any ideas on how I can debug or correct this?

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