SLI vs. CrossFireX: The DX11 generation

With this and many other questions in mind, we fired up the test rigs in Damage Labs and set to work, testing a ridiculous 23 different configurations of one, two, and, yes, three graphics cards against one another for performance, power draw, noise, and value. Could it be that doubling down on mid-range graphics cards is a better path to gaming enjoyment? How does, well, nearly everything else perform in single and multi-GPU configs? Let's see what we can find out.