Gideon- most require a little more then 5v i believe
5v barely made the fins move, and at 7v they're already dead silent, i couldn't hear mine but were definitely moving fast enough. although my intake also has a built in housing that shields more noise then a traditional case i imagine. most fans need 7v, and it also has a 40% gain over 5v so it just seems if you have an L1A it's going to be quiet enough already, at half speed it's gonna be dead silent, just didn't feel a need to go down to 5v.