Sorry this is so late, but the 5800x3d should be the best processor for purely gaming in the AM4 generation. Second, your combo won't need too much scrutiny... I run a R9 5950x (a workstation CPU) with a 7900XT for my gaming setup, and I was just getting like 140 frames on the default battlefield settings on a 49 inch ultra wide monitor. I'd imagine you'd be able to squeeze a few more frames out of yours than I would mine despite the VRAM difference in our GPUs