[cucubelu]

The thing is, it does not remove the problem, my hardware supports DX11, but the lower DX I set the less lag I get. So with DX8.0 I can play it with almost no lag, but again, it's not a solution, I just dumped down gfx. Before I could play it with all maxed out 150-180 fps, it's something else that causes the lag.

Can you get the software called EVGA Precision? It will allow you to monitor your graphics card internal sensors, including fan, temp, clock etc. That could be where the problem lies.