RX580 not using full Power in Apex (fps lags)

Hi, ive got a new   GIGABYTE RX580 8GB and a Ryzen 5 2600. Apex Legendsbjust uses half of my GPU (80-144fps) jdepends on how much  % power is used (10-99 %) MAX 80-100 W. In Benchmarks im getting g...