If you're gonna play FSX at decent settings, you need a DESKTOP with AT LEAST a quad core i5 at around 3.5-4.2 GHz, an SSD, and a GTX 760.
Believe me, I play FSX and there is no laptop (unless you get an Origin laptop) that can play FSX decently (over 25 fps).
EDIT: FSX is more CPU-bound. Let's say you have an i7-3770k at 4 GHz with a GTX 760. If you get a 780ti, you will, at most, get a 1-2 fps boost. The people here probably haven't worked with FSX before.