Reviewers monitor room (ambient) temperature. But room temperature really isn't the important temperature.. it's not the air temperature going into cooler. They need to monitor the temperature of the air 2-3cm in front of the cooler. This is the temperature of the air that is doing the cooling, not the temperature of the air in the room. The temperature of the room is only relevant to the temperature of air going into the case, not the cooler.
Reviews done inside of cases show CLC being cooler than air coolers is because they test in a case but the reviews out in the open only show a couple of CLC being better than air.. CLC by design mount to case.. the case separates the cool intake from hot exhaust.. the radiator is drawing cool air on one side of and exhausting hot air on the other.. often using radiator as intake into case
When they run the air coolers inside the case they do nothing to optimize the case airflow.. the hot exhaust is not kept separated and exhausted out of case.. instead some of it mixes with the air going into cooler making it hotter. Every degree the air temp rises going into cooler is a degree hotter the CPU is.
And the faster the cooler fans run the more heated air gets mixed into intake air.. and the hotter the cooler intake temp is!
I believe case fan speed should be controlled the same as CPU and GPU fans are. We need to move at least as much air through the case as the CPU/GPU fans move through coolers.. but instead ramping up case fan speed to supply more air as cooler fans increase case fans normally stay at lower speed.. not enough air at full load and too much air when system is idling. After building several systems with case fan speed controlled by CPU/GPU I can say it works very well. Systems are silent at idle and because of increased case airflow under load intake air temps stay lower so CPU/GPU cooler fans run slower and system is quieter under load too.
Working with airflow is something I'm pretty good at. Worked R&D in racing industry for awhile getting air in & out of engines, the airflow to engine intake and airflow to & from radiators and brakes. Found and learned some amazing things to improve the airflow and cooling. Spent most of my time on head porting, angles of valve seats, combustion chamber design, even direction of spark plug electrode makes a difference. Exhaust tuning is also a challenge. Some of the best years of my life. Edited by doyll - 7/16/13 at 3:31am