fps drop Fullscreen FPS drops

[kaitoxv1]

I'm running an intel core i5-7600

24 gbs of ram

gtx 1060 6gb from asus OC 

 

Settings:

DirectX: 11

resolution:3840*2160

aspect ratio: auto

refresh rate: 60hz

FXAA: on

MSAA: off

Vsync: on

Texture quality: very high

Shader quality. high

Shadow quality: very high

reflection quality: very high

reflection msaa: off

water quality: very quality

particles quality: very high

grass quality: high

soft shadows: softer

post fx: very high

motion blur: off

anisotropic filter: x16

ambient occlussion: high

Tessellation: very high

 

I use the same settings for Fullscreen vs Windowed/Windowed borderless 

In fullscreen i get 30-35 fps max while in windowed borderless i get 59-61 fps like 99% of the time.

Havent tried in other games. 
Just checked for drivers updates and they are all updated.

I'm adding the OC settings
 

[Moonzy]

turn off vsync, see if that fixes it

[kaitoxv1]

Thanks, I'm getting 58-75 fps now. I kept the game running for about 30 minutes it didn't drop below 58.