Frame drops on beefy pc

can someone explain why im dropping to like, under 200fps when i'm in game, I have a R9 9900x and a 4070ti super, I feel like i should be consistently running this game at like at least 300fps but im noticing so many drops, I'm running a 320hz monitor so it is kinda annoying dropping to like, half the refresh rate of the monitor, is it just a UE5 problem or like, is my PC busted somehow