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FSX-SE AffinityMask?

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unitedstates
I am confused about the way FSX and Win10 handles the AffinityMask setting in the cfg file.
I enter:
[JOBSCHEDULER]
AffinityMask=63

in the cfg file every thing seems to be working ok until I open Task Manager to view CPU performance and I get this:

AM63.JPG

As you can see, Core0 is pegged at 99% and it stays there thru out the whole session and all other Cores fluctuate between 26% to 99% every 60 seconds which causes stutters in sim
What is it with the 60 second thing? My plane is sitting still and it still does this. Very annoying!
Now I select the details tab and set AffinityMask to all Cores from within the task manager I get this:


AM63TM.JPG



Notice how all Cores even out in usage with this annoying CPU spikes every 60 Seconds.

I don't understand the difference in setting AM in the cfg or by setting it thru Task Manager. Why the difference?
 
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