i have an HP m9500f with an 9750quad 2.4z processor 8Gig ddr2 ram MS-7548 Aspen mother bordsocket type am2 350wPSU with a GEFORCE 9500GS card. im now thinking of replacing the 350wpsu with a 620wPSU and moving to a XFX HD 6850Radeon card. my question is will it fit in my case? theirs a small thin card just above the x16 slot where the 9500gs card is in my case now im not sure what it is?, just know its not far above the 9500gs card. could i pull that card then put the 6850Radeon in? what is that card? anyone know about HPs enough to let me know if i could do this?