Graphic card selection dilema
I plan to built a new PC which I would use primarily for RAW picture editing, batch processing (DXO Optics and PS CS6) and some video editing (full HD clips from 5DMkIII and rendering full HD mp4 files via ProShow Producer). I am thinking of i7 4770 processor, 16 GB RAM and SSD 250GB for system and apps. What I am not sure is a graphic card. As I try to make machine as silent as possible with reasonable budget, I would prefer the graphic card with passive cooling (NVidia GT 640 2 GB). On the other hand, I am in doubt that rendering speed will suffer. I found more expensive but also more powerful active cooled NVidia GTX 660 DCIi 2 GB. Will the difference between these two cards apparent for editing activities mentioned above? Many thanks in advance.