How much watt does my computer use?

[Hopje]

I need to know if I need a new power supply.
My configuration is:
AMD Athlon x2 4400+
2 GiB DDR2~800mhz
2x DVD
1x SATA2 ~300, 160GiB
Motherboard: Asus m2n-mx
CRT screen 17"( has got his own powerpoint )
D-Link airplus 520+ (network card)
video onboard / sound onboard
I need to know ( I now have a 350 watt power supply ) because I've got here a X1950 PRO videocard, but I dont know if the powe supply delivers enough. Is there a progam to meassure it?
Thanks..

[TamiyaGuy]

There isn't really a program to measure your power usage, but 480 Watts should do fine for pretty much any computer.

[Hopje]

But I still haven't got a real answer, i'm going to buy a 500 watt supply, but i dont know if it can damage your system when there's isnt enough energy..

[Hopje]

(im going to buy it next week) But i want to use it now ( my onboard sucks.... ( geforce 6150SE 256mb NOT shared ) ) So that's now in fact my question, but your answer helped me alot !

[Haggard]

At 1/2/08 12:18 PM, Hopje wrote: But I still haven't got a real answer, i'm going to buy a 500 watt supply, but i dont know if it can damage your system when there's isnt enough energy..

When there's not enough power your system won't even start. It's as simple as that.

[CaptainBob]

Most modern video cards will simply operate in a low power mode if your power supply isn't sufficent. The card won't be nearly as fast or have all of the features it otherwise would have.