I am looking for a slimline graphics card that is better than the AMD Radeon HD 6450 that I am currently using. I want to be able to run the modern day games at full resolution if possible

I have a dell slimline PC and all other requirements for most of the newer games are met except my graphics card. I am wondering if there is something better available as low profile that will let me run most of the newer games out since last year.