todda: The GTX 590 is an NVIDIA card that is four or five generations old, and came in late 2010
The 480 that you are referring to is probably the AMD RX 480 which just came out in 2016 and is actually fairly powerful for it's price.
Don't pay attention to the numbering as graphics vendors often do things out of order, etc. and start re-numbering cards on a whim. I would simply get the full brand, letters and numbers denoting a card model, and look it up specifically to get the specifications.
In this case, it just so happens that AMD's current card numbering scheme started catching up with the numbers for older Nvidia cards.
No, the minimum requirements do say Nvidia GTX 480 and the pages I was looking at were comparing different Nvidia cards. The minimum AMD is a Radeon 7870.
The game works fairly well on my GTX 590, on the ground at least, I haven't managed to fix the ship and take off yet.