Wrong CPU CORE count in any software (sometimes).

[papafiogos]

 

Hello people,

I have just built my first build with the specs shown below:

CPU: AMD Ryzen 7 2700 8 core/16 Threads
RAM: 2x8 Corsair 2666MHz Ram
Motherboard: Asrock X370 Pro4
GPU: Asus Astrix GTX 1050 Ti 
Power Suply: Thermaltake Smart RGB 600W
OS: Windows 10

The PC is standing on a desk without any movement. Also Windows is set at Basic Performance mode.

At first everything seemed to work fine until i noticed something while I was benchmarking my system using CINEBENCH. It showed I had 7 Cores and 14 Threads. 

Immediately, I checked task manager and under the Performance tab it said also that my CPU had only 7c/14t. As a matter of fact it showed only 14 diagrams under Performance/CPU tab. 
Finally I also checked AMD Ryzen Master in which I had never changed anything and while all the 7 first cores were working fine, the 8th was stuck at 600Mhz not moving at all. 

After some Internet research, I found some solution that didn't work for me.

Internet Solution #1: Search "msconfig" -> Open "System Configuration" -> Choose "Boot" tab -> Choose "Advanced Options" -> Uncheck "Number of processors"
In my case #1: The "Number of processors" box was already unchecked.

Internet Solution #2: Check about Core-Parking Issue.
In my case #2: None of my cores were shown core-parked. In fact the 8th was not shown at all in task manager. 

Only working temporary solution: Reboot. Oh yes! I noticed that when I boot my PC it sometimes has 7c/14t and sometimes it has the normal 8c/16t.

So in summary: Sometimes when I boot my PC my core count is less that the normal (7c/14t) and it needs a reboot so that everything goes back to normal(8c/16t). WHY?

Note that when I boot with the normal number of cores and threads every software is showing them perfectly.