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Can't get the CPU utilization above 52%

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Hi all,

I have an Intel i7 950 CPU based PC with Windows 10 TP on it which, no matter what, I cannot bring to 100% CPU utilization. While taking the attached screenshot, I was running prime95.exe.

I have tested the same scenario on the same computer running Windows 8/8.1 and got the same result. However, when doing the same thing under Windows 7, CPU utilization went up to 100%.
Anybody has any idea why this happens? Is it a different default setting somewhere (probably in registry)?

Since I have this fast machine I would like to be able to use it at its full strength - the way things are now, my old Quad core 2 GHz PC is MUCH faster than this 8 core 3 GHz one (as I measured in several tests consisting of transcoding videos).

Thanks for any pointers!


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