power needed for pc?

[Alaa]

how much power and amper do i need for a computer (P4 3G,6800Xt,512DDR..) power supply rated at 550..?

 

[Bobthelost]

550W should be plenty. You're thinking TPII?

I'd go for a 450W FSP if you're on a budget.

 

[Billb2]

Originally posted by: Alaa
how much power and amper do i need for a computer (P4 3G,6800Xt,512DDR..) power supply rated at 550..?

There are many on line power calculators. For example http://journeysystems.com/power_supply_calculator.php
and
http://www.schrockinnovations.com/powercalc.php
Google will find more for you too.