Originally Posted by epic1337
wait, we're talking about fans for case right? not fans for heatsinks?
i was wondering about one thing, if an exhaust fan were to be placed on a slot without the grills, which fans would be good?
in theory, since theres no obstructive grill then a fan with the highest CFM within a certain noise threshold would be best.
but cyclops doesn't test for CFM sadly, so we can only rely on other reviews for a rough estimate.
Honerstly the difference between a 'case' fan, a 'cooler' fan and a 'radiator' fan is what they are mounted on.
Sure each has different resistance to airflow but which has the most depends on what case, cooler or radiator they are on. Some cases with fancy grills and good filters are more restrictive than a good radiator is.
CFM is a name that is more often then not miss-used and really means nothing without knowing the resistance pressure differential and rpm .. something rarely shown.
What it all boils down to is having a fan that is able to overcome more resistance (build more pressure) than we need is not a problem, but having a fan that cannot means we have little or no airflow, and that is a big problem.
It's like having a sports car that will go 120mpy in 8 seconds and can do 120mph for hours at at time on a race course compared to an old clunker car that goes 30mph in town, can barely reach 60mph on flat ground on the highway and can't make it over a mountain pass without overheating. We can drive the sports car at 60mph all day long, over high moutntain passes or drive it 30mph in town. The old clunker will get us around town, but just barely .. but is no good on the highway and definitely not going to make it on a race course. The sports car can still drive around town, but can do so much more.