Just did a clean install of Win 10 Pro on my office machine. I just happened to be in need of forcefully killing a frozen app and went over to the performance tab and noticed that it was only showing 4 cores instead of 8. I have looked in the device manager and there are 8 cores listed in the processor drop down listing. I also have installed CPU-id and it too is showing my correct processor with 8 cores. So this has to be an OS issue...has anyone encountered this with Win10?