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Voltage jumping up and down

Tech Wizard
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Hello,

 

Built a PC for my father, with an i7 3960X + an Intel DX79SI motherboard. Set voltage to 1.200 in BIOS. When checking in CPU-Z, the voltage is not constant 1.200V, but jumps all the way up to 1.300V+ by itself, in idle. Why is the voltage not staying consistent at 1.200V like I set it from the bios? 

EDIT: I think it's the setting just below Voltage, the CPU VR Droop Control. I have 3 options there:

Low V-Droop (performance)

Mid V-Droop

High V-Droop

IMG_0456.JPG

 

And here's what's happening when I disable Turbo Boost: 

 

IMG_0457.JPG

Main:  1650 v2   @ 4,6GHz   -   X79 Deluxe                -   GTX 1080 @ 2000MHz   -   24GB DDR3 @ 2400MHz / CL10

Side:   i7-4790K @ 4,5GHz   -   Maximus 7 Hero        -   GTX 1070 @ 2114MHz    -  16GB DDR3 @ 2666MHz / CL12

 

HWBOT

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Bump! Does anyone have any info regarding why voltage is jumping? Or perhaps if it's possible to disable this VR Droop from Intel motherboards?

Main:  1650 v2   @ 4,6GHz   -   X79 Deluxe                -   GTX 1080 @ 2000MHz   -   24GB DDR3 @ 2400MHz / CL10

Side:   i7-4790K @ 4,5GHz   -   Maximus 7 Hero        -   GTX 1070 @ 2114MHz    -  16GB DDR3 @ 2666MHz / CL12

 

HWBOT

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