You will need
  • - computer with Internet access;
  • browser.
Go to the website There is a list of the processors and graphics cards with an approximate value of the power consumption. To learn the required power supply, select your model of processor (e.g. Core 2 Duo E6700 - 62 W), then determine how much it consumes your graphics card (e.g. GeForce 7950GT – 61). Then, determine how much the average consume other components. For example, you have 2 GB of RAM (about 20 watts), Winchester (on average, 25 W) and two coolers (8 watts). Total, we get a total of about 170 watts. You always have to consider the value of a stock, so the calculation of unit power in this case gives a result of 200 watts.
Go to the website and use the online power calculator PSU to find out what unit of power you purchase. In the first field choose the brand of processor (e.g. Athlon 64 4000+), the capacity of the next field is set automatically, depending on the form of your chosen processor. Next, in the "Crackdown" , set its value, of course, if you are doing overclocking your CPU. Next, set a value for CPU. In the next field, set the number of hard drives on your computer and optical drives. For example, you have 2 hard drives and 1 drive. Next, install the power to your motherboard to find out the power supply. In the next field, set the number of fans. Next, set the number of memory chips.
Select in the next section the model of the video card is also necessary in order to determine the power supply. For example, you have a GeForceFX 5900. Next will be automatically filled in with the value of the power for the graphics card. Set the value of the acceleration, if it was made. Below is the readout power for your computer. The first figure is the power consumption of the processor, then the total power and the last number is the peak power of the computer. Focus on the last digit in the purchase of unit power. In our example, it turned out 234 watts. Therefore, the power supply must not be less than given numbers.