Maximum power usage

[Cavan]

hi
Apart from the maximum CPU operating temperature, the maximum power usage under typical worst-case conditions is also essential for selecting a suitable cooling system. i try to find out but not get enough what i want please can any one help in this to find out calculation .??

[Omari]

hi
i can help you if you provide me some information about your hardware ,so i will get idea of calculation .

[Viceman]

The theory behind calculating the power usage for an overclocked CPU is very simple: Power usage is proportional to clock speed, and proportional to the square of the core voltage.

Before we express this as a formula, let's intruduce the following variables:

* Ps is the power usage of the non-overclocked CPU
* Po is the power usage of the overclocked CPU
* Fs is the clock speed of the non-overclocked CPU
* Fo is the clock speed of the overclocked CPU
* Us is the default voltage of the non-overclocked CPU
* Uo is the voltage at which the overclocked CPU runs

Here is the formula:

Po = Ps * (Fo/Fs) * (Uo2/Us2)

A simple example:

We want to calculate the maximum power usage of a Athlon "Thunderbird" 1.33 GHz CPU overclocked to 1.6GHz using 1,9V voltage. From this page, we find out that:

* Ps is 70W (max)
* Us is 1.75V

Also, we know that

* Fs is 1.33GHz
* Fo is 1.6GHz
* and Uo is 1.9V

Therefore:

Po = 70 W * (1.6/1.33) * (1.92/1.752) = 99.26 W

Values calculated using this method are not very accurate, since I/O voltage and FSB speed is not taken into account. However, they should be precise enough to help you decide what kind of power supply and cooling you need.