100% gpu

Please help me! I have a 2 year old HP Omen 17inch 1080 resolution screen with a NVIDIA GeForce GTX 1070, i7-6700HQ Processor, 8GB Memory, Windows 10 home. I have DirectX12. Everything runs smoothly, all except my frame rates per second in games. Everytime I load a game - Assassin's Creed...