active cores vs power usage

[chrcoluk]

So here is the scenario

have a intel 4670k
max turbo clock is configured at 4.3ghz
at non turbo speeds the voltage is at stock levels +0.05v
at turbo speeds the offset is increased to +0.025v

Since every cpu depending on its silicon lottery position has different stock voltages basically my vcore runs at 1.15v when at turbo clocks.

So for simplicity sake its 1.15v under max load.

Now I have purchased a 700 watt UPS, which at 700watts usage only gives 2.5mins usage, but of course my PSU is only 600 watts and my max consumption is nowhere near that. Using coolermaster's PSU estimator, for my specs and vcore level they spit out 402 load wattage.

http://www.coolermaster.com/power-supply-calculator/

Here is where I am curious.

So in the scenario we have this so far.

intel 4670k at 1.15v usage
nvidia gtx 1070
plus with other pc components estimated max power draw is 407 watts.

Scenario is I am playing tales of berseria, typically this loads up one core to 99% (not hard usage tho it just puts core in sleep mode), other 3 cores average 1-15% cpu usage. Turbo mode will put all cores at 4.3ghz turbo speed even if only one core is loaded on my system.

So the question is, if say one core is under full load, 3 are idle, total cpu usage at 25%, what sort of affect does this have on watts usage. I know ramping up clocks is not enough to just max out power draw, the cpu has to actually be busy as well, but I am curious if 3 mostly idle cores reduces the overwall active consumption significantly?

Hope I explained this well enough for a an answer.