these have been out for years, still have the 220CFM Delta I used on a direct die pelt setup from many years back....yes, it worked, cooled a P4 2.4 clocked to 3.6gig to about 1*c at idle with a custom extraction setup....
however, if you value your hearing you will just look at this fan with amusement, and, because of their enormous power and RPM's, they need to be handled with care....even if holding on to one tightly the torque thrown off at startup can make the fan fly out of the hand and they are hugely dangerous to accidential fingertip accidents....
however, when it comes to cooling they do work, earplugs are definately a requirement....BTW, since they are such a high output fan, it may not even startup @7volts, I seem to remember I needed a minimum of 8+ volts to get it to startup....normal fan controllers will burn up in a few minutes with this monster....an adjustable PS (Meanwell) would be the way to go....
laterzzzzzz..................