I just bought a new video card?

I just got a new video cards its a Radeon 2600 HD Pro and I have a 250 watts max power supply. The other things i have is just a few fans, 2 80 gig harddrives, one sata, 2 512 ram's, a 2.4 processor, and just ordinary mobo. Do i need to get a more powerful power supply?|||Yes, you should get one around 400w.|||Yes.|||yes