ya know the OD11 is not that deep, cant even put the glass on mine with the HC block on my KP card, as mentioned before , pull off the glass door and see if changes , if not re-paste the card cooler , but as narrow as the case is and the design of the cooler , air has to escape on the side of the card and when in conventional , that hits glass and the motherboard, I used a vertical mount in my case with air cards to avoid this, the dust filters can be quite restrictive in this case also so your fans my not be doing what you think they are.