1920x1080
Elder Scrolls High 4XAA
R9 290X: 179.6FPS
GTX 780: 146.8FPS (+22.3%)
GTX Titan: 157.5FPS (+14%)
Battlefield 3 Ultra 4XAA
R9 290X: 108FPS
GTX 780: 95FPS (+13.7%)
GTX Titan: 103FPS (+4.9%)
Dirt Showdown Ultra 4XAA
R9 290X: 119FPS
GTX 780: 104FPS (+14.4%)
GTX Titan: 99.6FPS (+19.5%)
Far Cry 3 4XAA
R9 290X: 59FPS
GTX 780: 55.8FPS (+5.7%)
GTX Titan: 59.6FPS (-1.0%)
Hitman 4XAA
R9 290X: 74.8FPS
GTX 780: 62.8FPS (+19.1%)
GTX Titan: 61FPS (+22.6%)
Crysis 3 Very High 4XAA
R9 290X: 45FPS
GTX 780: 46FPS (-2.2%)
GTX Titan: 48FPS (-6.2%)
Tomb Raider Ultra 4XAA
R9 290X: 68.2FPS
GTX 780: 56.9FPS (+19.9%)
GTX Titan: 63.4FPS (+7.6%)
Metro Last Light Very High:
R9 290X: 60FPS
GTX 780: 62FPS (-3.3%)
GTX Titan: 68FPS (-11.8%)
5760x1080
Battlefield 3 Ultra 4XAA
R9 290X: 46FPS
GTX 780: 37.8FPS (+21.7%)
GTX Titan: 41FPS (+12.2%)
Dirt Showdown Ultra 4XAA
R9 290X: 63.7FPS
GTX 780: 48.6FPS (+31.1%)
GTX Titan: 50.8FPS (+25.4%)
Far Cry 3 4XAA
R9 290X: 26FPS
GTX 780: 24.5FPS (+6.1%)
GTX Titan: 26FPS (0%)
Hitman 4XAA
R9 290X: 34.8FPS
GTX 780: 27.6FPS (+26.1%)
GTX Titan: 30.1FPS (+15.6%)
Crysis 3 Very High 4XAA
R9 290X: 20.5FPS
GTX 780: 16.5FPS (+24.2%)
GTX Titan: 17.4FPS (+17.8%)
Tomb Raider Ultra 4XAA
R9 290X: 25.3FPS
GTX 780: 20.7FPS (+22.2%)
GTX Titan: 22.9FPS (+10.5%)
Bioshock infinite Ultra DOF
R9 290X: 36.5FPS
GTX 780: 37.8FPS (-3.5%)
GTX Titan: 39.8FPS (-8.3%)
Metro Last Light Very High
R9 290X: 29FPS
GTX 780: 27FPS (+7.4%)
GTX Titan: 31FPS (-6.5%)
Summary:
In average over 8 games, R9 290X is 11.2% faster than GTX 780 in 1920x1080, and 16% faster in 5760x1080.
In average over 8 games, R9 290x is 6.3% faster than GTX Titan in 1920x1080, and 8.4% faster in 5760x1080.