The Apple MacBook Air 13 inch screen size with 128GB hard drive, 2GB RAM and Mac OS X Leopard operating system. Being carved from a single piece of aluminium pays dividends. It makes MacBook Air incredibly light, amazingly thin, extremely durable and eminently portable. The NVIDIA GeForce 9400M brings amazing, high-speed graphics to MacBook Air, delivering a graphics performance boost up to 6x that of the original model.