Do you want to good new first or the bad new? Well I guess I'll start with the bad. I'm sure you would like an x800xt, but unfortunatly your card only has 12 pixelpipes enabled according to the screenshot. The pro version has 12 pipes and the XT has 16 pipes. The Good news may be that you could very well unlock the other four pipes! You'll have to do a little research and askin' around, I know many of the x800Pro's can be unlocked, particularly the VIVO editions. Then agian that might just be the AGP version.. sigh...
Definitaly look into unlocking those four extra pipes, I am sure someone around here knows!
Here is some stuff to get you started, I do not know if it is exactly relevent to your particulary card though.
++ from the looks of that picture of your card it looks like you have the signature "yellow audio plugin" of the VIVO cards. Looking promising for you unlocks!