I looking to change my X850XT PCIe card for one of those fancy X1800/X1900 not sure which, but anyway I currently have a Abit AN8 Ultra standard m/board which type of graphics card could I use. I'm not sure with all this crossfire master/slave situation. Also which card is quiet - I currently have fitted Arctic Cooling Rev.2 ATI 5 and its very quiet. I would like something equally in noise if possible. Any suggestions Any help would be appreciated.