Quote:I think case cooling is the most important part of a build and sadly is usually the most neglected. Most don't know how to do it properly and even those who do spend many hours setting up different combinations and testing / monitoring cooler intake and other air temps inside of case. What works at idle may not work at full load, or visa-versa. Changing component locations, case and/or cooler fan speed/s, kind of fans used, vent grills, filters, case design, case placement, etc all effect how the air flows. Changing CPU cooler or GPU often cause major changes in airflow and cooling. Even cable management can have a huge effect on airflow. Or how much dust is in filters.
I've done setups where everything was perfect when system was in use but motherboard components ran hot at idle.. Had to increase idle speed 50rpm and problem was solved.
It's not uncommon for CPU cooler exhausting back toward rear vent to to cycle their own heated air toward the front and heat up their intake air.. especially when CPU is working hard / fans moving more air than rear exhaust fan can exhaust. I usually duct from back of cooler to exhaust vent and/or use a fan for case exhaust that moves at least as much, preferably more air as cooler fan/s do.