I just stumbled across a bargain on a x1900xt. I was wondering if my power supply will suffice, before I go and install it. I have an Ultra xfinity 500 watter. I read somewhere that the 12v rail needs to be 30a or greater. The Ultra website says something about "dual rail technology" and shows an 18a and 16a. I'm just wondering if this thing will fry if I plug it in basically.

Also will I notice a big difference with this card over my x850 pro? I have a amd 3700+ with 1 gig of Ram. Thanks for the help.