I'm not sure about Ultra, Bo3 likes its VRAM once you start turning up settings and it likes its horsepower, not sure about IW. To give a reference I have a 3GB R9 280X and it runs BO3 at High at 1080p at 80-100FPS.i call bs on that... i was able to run bo3 on a verry shitty computer (that can only run waw ~20 fps) @ 280 fps... bo3 is not nearly demanding as waw is