I have this system configuration:
Intel DH61WW motherboard
Intel Core i3-2100 3.10 GHz
4GB DDR3 RAM
nVidia GT 430 2GB
And I want to install a DVD-Writer, a webcam and a printer in future. How can I know the power supply needed when all of these components are performing at highest possible limit and how can I know how much power supply is installed in my PC now?