[cucubelu]

Did this randomly start happening?
What type of monitor do you have?
Can you check your dxlevel?
Does it also lag whenever you use vsync?
Check event viewer for error logs.
Definitely fool around with newer and older drivers.
Lower your resolution a bit?
I ran into an issue where my gtx680 ran too fast for my monitor and started tearing my screen. I ended up running css in -gl mode, -dxlevel 111, and bumping down the resolution which fixed it

Double post

Does it get too hot?

Monitor: It is a 32'' ASUS 2ms, 2012 model.
DXLevel: Tried most of them. Not the problem.
VSync: Does not help (On / Off tested)
Event Viewer: No error computed.
Drivers: Done old, new and betas. No change.
Resultion: Lowest/Mid-levels/Highest tested. Same problem

Turned off SLI mode it is helping a bit, but not a lot. Going to keep playing around a bit with settings when final exams are done. I might have to go to Steam support, but I have feeling they will just give me the run-around solutions.