Both didn´t make a difference but I found a solution
Apparently this is a problem most Socket 1156 motherboards share cause of the power saving features. I went to the BIOS and turned off the following
MB Intelligent Tweaker (M.I.T.)” -> “Advanced Frequency Settings” -> “Advanced CPU Core Features”:
turned off “CPU Enhanced Halt (C1E)”
turned off “C3,C6,C7 State Support”
After I turned this off, the problem ceased to exist and now my power supplies are both silent as can be.