Which 3D Graphic Card is the most powerful and suitable and reasonably priced for using my CAD & render softwares!? I work with architecture & interior design projects so I need something really strong! I'm just overwhelmed by image distortion, graphic & sequence delays and software crashes (due to poor graphic card power)!!!

First, what are the full specs of your computer?Second, what programs other than AutoCAD 2013 are you running that might make use of a better graphics card?Third.  What is your budget?