i put an x1800xl in my girlfriends pc last weekend cuz thats what she wanted out of the cards i told her would run "anything",..its a nice card,i havnt overclocked it at all because i bought it for "her"(and i think she actually creates instability so i leave things as default as possible,..shh dont tell her i said that hehe)
but yeah its a good card i played around with it a bit, its nice it runs pretty smooth has decent IQ,and it didnt argue with me about anything i threw at it,.1024x768@85hz is her res and it plays it well with high quality's with AA enabled(she can play vampire bloodlines very nicely,and thats the game she was complaining about the most with how it ran before this card(my old old 9800pro she was actually pissed i sold my 6800gt and didnt let her use it),but shes happy,..so im happy,..lol)
and youd get a large boost over an x800pro,i garuntee youll notice the difference