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Does Overclocking + undervolting use more power than stock?

post #1 of 5
Thread Starter 
I am contemplating overclocking an Exynos CPU that comes stock as 1.2ghz @ 1275mv however it is stable at 1.3ghz 1200mv. would the latter configuration consume more battery overall?

This is not necessary whatsoever, but if it uses the same ammount of power and produces less heat, why not?

This is for a smartphone, so battery usage is important.
Edited by Scorpion667 - 10/18/11 at 9:26am
    
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post #2 of 5
Always wanted to know this too. Did a little research, this is from Wikipedia.
Quote:
The power consumed by a CPU, is approximately proportional to current CPU frequency, and to the square of the CPU voltage:[1]
P = CV2f
(where C is capacitance, f is frequency and V is voltage).
So if you increase the frequency without increasing the voltage, power consumption still goes up. You'd have to to a little more math when you're underclocking to see if you're consuming more or less power.
post #3 of 5
I tried your situation out, it looks like you'll be using less power at your overclocked settings. Someone correct me if I'm wrong. I'm assuming the capacitance would be static for both settings and omitted it from the equation (I'm no math major/electrical engineer).
post #4 of 5
I haven't measured power consumption directly but I'm assuming heat can be used as an indirect indicator of power consumption.

I see lower temps when I run 3.2 GHz at 1.0 V than I do at stock voltages and 3.07 GHz stock speed. Yes I know it is a very mild overclock but I really don't have a need for anything faster. I do it more for fun than anything else. I'm more into silent computers than crazy overclocked rigs that are noisy.
    
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post #5 of 5
Quote:
Originally Posted by Epitope;15355391 
I haven't measured power consumption directly but I'm assuming heat can be used as an indirect indicator of power consumption.

I see lower temps when I run 3.2 GHz at 1.0 V than I do at stock voltages and 3.07 GHz stock speed. Yes I know it is a very mild overclock but I really don't have a need for anything faster. I do it more for fun than anything else. I'm more into silent computers than crazy overclocked rigs that are noisy.

Heat is a GREAT indicator.
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