Hum, I wonder just how well it would fare in a restrictive environment i.e. a heatsink or radiator. It may shine best as a case fan. I need to look more into this one.
According to Noctua, its designed more for case fans and less restrictive environments: http://www.noctua.at/main.php?show=whic ... _me&lng=en
BTW, has anyone seen these for less than $20 a piece? Cheapest I've seen is $20.95, but not sure I'm comfortable spending ~$60 for 3 fans to replace my perfectly good Slip Streams; however, the extra 30CFM and quietness would be nice...