^ Yeah you probably could run it but . . . ^
I'm not saying don't buy SA but consider that the game runs the original ARMA 2 engine with oodles of code written on top of it, much of which was never intended to run on the aforementioned engine.
The game ran great for a while but has become a persistent source of aggravation from constant crashes & buggy game-play, to rampant cheaters & now broken loot tables.
This game is still super fun at it's best moments & an absolute nightmare at it's worst, with a probable completion date of never due to the unrealistic ambitions of it's devs (why would you try to take something that already works & try to make it better).
The original mod is more fun IMO but SA is way more cinematic in its game-play & runs a little bit better; the servers dictate your FPS in both & render massive swaths of the environment even if you are not in that particular area, so both can run pretty bad.