I'm using ASUS M3N-Ht Dlx motherboard with AMD x2 4200+ (65W) The board features an utility (AiGear) to lower the voltage of the CPU.
The max attainable difference is 0,08 V - how much does it reduce power consumption? Is it worth using?
I have no idea about physics, so any help with explaining this would be much appreciated!
Undervolting (AiGear) - how much power does it really save?
Moderators: NeilBlanchard, Ralf Hutter, sthayashi, Lawrence Lee
Lowering voltage is a great thing for reducing power consumption. But the amount of voltage reduction by AiGear is very small, so the resulting power consumption is not reduced much.
You can make a rough approximation of power consumption as:
P = C * MHz * V * V
So for your 0.08v reduction, from 1.35V which I believe is the default voltage of your CPU, reduces it to 1.27V.
Original power consumption:
P = C * 2300 * 1.35 * 1.35 ~ 4200 C
Undervolted power consumption:
P = C * 2300 * 1.27 * 1.27 ~ 3700 C
Thus your power consumption is reduced to (3700/4200) = 88 %
You can make a rough approximation of power consumption as:
P = C * MHz * V * V
So for your 0.08v reduction, from 1.35V which I believe is the default voltage of your CPU, reduces it to 1.27V.
Original power consumption:
P = C * 2300 * 1.35 * 1.35 ~ 4200 C
Undervolted power consumption:
P = C * 2300 * 1.27 * 1.27 ~ 3700 C
Thus your power consumption is reduced to (3700/4200) = 88 %