R9 290X vs. TITAN
The R9 290X is performance comparable to the GeForce GTX TITAN at 2560x1600 (1600p) and lower (1080p.) In every game we played we were able to match the same gameplay experience as the GeForce GTX TITAN. That means that every game played the same between both video cards, the same performance, same in-game settings, and same smoothness. Performance in terms of frames per second was either right under, or right at TITAN FPS performance. The performance differences were so insignificant that those did not translate to any noticeable gameplay differences at all.
The situation changes when the Radeon R9 290X is pushed up to Ultra HD 4K display resolutions. Whatever magic AMD is doing at 4K, it is working. We found that the Radeon R9 290X was faster in every game compared to the GeForce GTX TITAN at 3840x2160. It wasn't just a little bit faster either, it was anywhere from 10-23% faster. This is a significant difference. At 4K resolutions, you need every bit of performance you can get to achieve playable performance at high in-game settings on a single video card. The Radeon R9 290X is clearly the card for Ultra HD 4K.