the reason why i said i wont recommend gfx cards is cos dell. hp. pb machines are built to spec
the are built to run that hardware spec
you start upgrading you will come across brick walls in terms of mainboard, memory, power supplies
the newer ATI series gfx cards suck a lot more juice than the nvidia cards and if your volt rails start becoming unstable especially the 12v then u will notice lock ups and reboots
personally m8 buy like for like due to the way the pc is built