GPU doesnt use full power ingame

Sounds like you guys need to get your MSI sorted. Not the motherboard brand, Message Signal Interrupts. Windows by default ships with line-based interrupts active usually for most things by default, a terribly inneffcient and old school way of devices and peripherals communicating with your CPU. It's called Line based because it literally processes them one at a time in a line or queue. MSI is the new much more efficient method able to perform numerous requests simultaneously. The difference can be staggering. Battlefield 6 at Medium settings was literally unplayable due to input lag and video lag on my system till I optimised this using MSI Utility V3. Just type that into Google and its free to use. You probably need to be shown how to get this right, it involves understanding device manager and enabling the same priority on the device and the PCI express port that homes it, to ensure no bottlenecks, but rather than explain it myself, there's heaps of videos on Google or check out ASUS ROG forums for getting the hang of it. Basically use MSI Utility V3 to turn on this functionality and then assign a priority. I can now run the game in overkill at close to 140fps no input lag its a game changer. I have set my GPU, mouse and keyboard, game M2 SSD drives and audio to high priority, and the associated PCI Express ports that house these devices. Wham no  lag no stutter, no drama.