These are the frame rates you will get from these cards at 1080p is that what you want ?
1920x1080 R9 270X HD7870 GTX 660 GTX 760
BioShock Infinite, DX11 Ultra DDOF 55.0fps 52.2fps 52.3fps 68.8fps
Tomb Raider, Ultra, FXAA 74.2fps 71.1fps 60.1fps 77.5fps
Metro 2033, Very High, 4x MSAA 31.4fps 28.5fps 25.8fps 31.2fps
Metro: Last Light, Very High, SSAA 24.1fps 22.6fps 21.4fps 27.7fps
Hitman: Absolution, Ultra, 8x MSAA 30.8fps 29.2fps 22.8fps 30.1fps
Sleeping Dogs, Extreme 36.9fps 35.4fps 32.5fps 42.5fps