Windows 10 - HP Z600 not showing correct amount of threads / logical processors

[bburton0334]

I have an HP Z600. I recently switched out my previous 2x Xeon E5506 which were 4 Core 4 Thread CPUs. 

I switched them out for 2x Xeon x5650, which are 6 Core 12 thread CPUs. However in my task manager, device manager, Core Temp, etc., It only shows that I have a total of 12 cores and 12 threads, which is incorrect as it should say 24 threads. 

Previously hyperthreading was disabled when using my previous CPUs in the BIOS, but I have since enabled hyperthreading in the BIOS but it hasn't changed anything.

I have also checked msconfig and nothing is checked in the BOOT Advanced Options.

Anyone have any ideas or suggestions on how to enable all of the threads?

[BeemerBiker · Accepted solution]

Yea, I have had the same thing happen.   It is due to windows not noticing the number of threads have increased.  There are two ways to fix it.  Try 2 first then 1. 

(1) Bring up the device manager and expand the processor list and delete all 8 of the cores.  This is a PITA as you have to not reboot until all 8 cores are uninstalled.

(2) Disable hyperthreading in the BIOS, reboot, then enabled hyperthreading and reboot.

[bburton0334]

Thank you! The 1st solution you listed fixed my issue.

[SDH]

For others... don't forget that Windows 10 Home only recognizes one processor even if the Hyperthreading option is enabled in BIOS.