I want to purchase a new Apple’s Macbook. But I am really confused between two graphic card. I have two options in front of me with Nvidia 320m and Nvidia 9400m. But I cannot able to decide between them. I want to know what are the difference between in this graphic cards. Can anyone help me to tell about graphic cards. I want one that can offer me good output on dual display. I am going to attach a gaming monitor on the macbook. I hope the gpu that I had mentioned anyone one among them can manage the display quality.