DarkCrow (DayZ)

Hello! well i want to 1st give my Pc specs: I5 4460 RX 580 8GB version 8GB of ram. The problem is that ArmA3 Doesn't use my GPU or Even the Cpu, the CPU use is always <50% and the GPU use is None. When it actually use the Gpu is when i Press ESC to check the Conifgs or something like that, in the actually gameplay doesn't use it even if i lower the setting or max it. Any help or advice is well receive the game is literally unplayable thanks to that AMD driver is 17.7.1