We'll start by benchmarking the game at the medium-quality setting, which looks far better than the low setting, but almost as attractive as the ultra setting. The most notable difference between medium and ultra is that the shadow edges are much smoother with ultra. But despite the rougher shadows, medium detail presents an attractive way to play that most machines should be able to handle.
Let's look at the benchmarks and see just how different graphics cards operate at this detail setting.
The game is clearly CPU bottlenecked at medium details, and there isn't much difference in performance all the way to 1920x1200. At 2560x1600, we do see some slowing down from the low-end cards, but even the Radeon HD 5570 offers playable performance. Remember that an RTS can remain playable at lower frame rates than twitch-prone games like first-person shooters. Nevertheless, even the Radeon HD 5570 delivers more than 30 frames per second (FPS) at 2560x1600.