hmmm.. I’am so often in 100% load ( real load ), never seen that windows killed my game 
But I think I understand the idea behind : let one core free for the system..
It might be interessting for which kind of CPU this would be helpfull. Possible a list should be created where it was helpfull.
Here you can see a switch where I disable Core0 and it jumps to another core.
( note: I made former a test-case, normaly CPU11 is my 100% core… and it is not a full-load scenario where also all other cores in near 100% load ).
PS.: DX11 is not limited to four cores,.. the most games only use max four cores.
EDIT:
ah yes.. I should think about more within the other topic