The Noctua will not affect your video card, if you mount the heat sink with the fans blowing towards the rear the warm air will be directed towards the rear fan. Also if you have a fan mounted in the top it will also aid in removing warm air. You also have places in the side panel to mount fans so you should have no problems with temps.
So i need to install my coolers not intake but to push air to out right?
And i Have Window version and i cant install side fans