That card actually has extremely low power consumption, so you'll be fine on that end. It looks like it's mainly branded as a blu-ray/dvd media card though.
It looks like basically you are just coming in with the "minimum requirements" for the flight simulation. To be honest, your probably not going to get the experience you hope for. It's a flight simulator, but I can't imagine with this machine that the game is going to feel very "smooth", and realism is the key right?
You're especially going to be worse off on the 43" screen. To make up for being at minimum settings, I believe you would have to lower your resolution toreduce the choppiness of the gameplay. Those pixels are going to be huge on your screen, it might really detract from the experience.
If you look at the specs on the simulator, I think someone here could probably help you bump up to a better pc that could max this game out (they aren't very high) for not a whole lot more $. I could be wrong, but I really imagine you want to hit higher specs on this simulator to get the experience you are probably hoping for out of it 
