Newegg - Power Supply Calculator
http://educations.newegg.com/tool/psucalc/index.html

เว็บคำนวน Power Supply อีกแห่ง

Work out the PSU you need when building your pC

Calcular a potência da fonte, para as peças que deseja utilizar.

The PSU Wattage we recommend only gives you a general idea on what to consider while selecting a power supply. PCI cards, External devices, USB and Firewire devices, Cooling fans and other components may need more power.