I do not know how to remove this metal bracket in the back of my computer case. I plan on buying a new video card and better video cards take up 2 slots for air flow it seems so i'm trying to find out how to remove the metal bracket. Will the video card overheat if i do not open this? can i even put it in? i plan on buying an evga gtx 550 ti, i dont know if theyre known for overheating or anything.