I just saw that Wagnard Tools (the guy that makes DDU) has released CPU Core Analyzer
Looks like it could be quite useful for checking core usage.
https://forums.geforce.com/default/topic/550192/geforce-drivers/wagnard-tools-ddu-gmp-tdr-manipulator-new-cpu-core-analyzer-updated-06-11-2015-/1/
https://www.youtube.com/watch?v=JdcS7J5gIVE
Looks like it could be quite useful for checking core usage.
https://forums.geforce.com/default/topic/550192/geforce-drivers/wagnard-tools-ddu-gmp-tdr-manipulator-new-cpu-core-analyzer-updated-06-11-2015-/1/