PSU Watts?

Hi, I am about to upgrade my PC with a X700 Video card and am not sure if the PSU is up to it.
I have seen a downloadable program to calculate the total watts needed, but I cant find it now.
Can anyone point me in the right direction please?
Happy New Year,
leo42

............................................

Windows XP Home
Pentium 4 2.00 GHz
1024 MB RAM
Nvidia MX460 (Omega 1.6693P)
DirectX 9.0c
1024 x 768 75MHz CRT Monitor
C Media sound
PSU 250W

a 250W PSU is not very big

have a look here

http://www.pcpowerandcooling.com/tec...y/power_usage/

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(Thanks )

Thank you very much for your prompt reply. As I thought, its time to spend some cash on a PSU. 400W?