Small fps on a powerful system (Grand Theft Auto 5)

Good evening everyone. The PC configuration is as follows: gtx 1080, amd ryzen 3600, 16 gb ddr4 3200 mhz. The video card was bought recently, it used to be 1060. The drivers were all reinstalled. In GTA on this system, at settings close to average, the fps is kept at 60, but quite often it sinks to 50-40. At 1060 everything was much better. Everything is fine with the card (for example, in cyberpunk everything is the same as in tests - on average 50 fps at ultra settings, there are no strong drawdowns).