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AMD Mantle Performance Preview in Battlefield 4 - AMD's Mantle is here for Battlefield 4. We take an XFX Radeon R9 290X video card for a spin under the AMD Mantle API and compare it to Direct3D 11.1. We look at performance advantages, compare resolutions, and even take a look at frame time. Is AMD Mantle everything it was cracked up to be? Let's find out in this performance preview.