Okay fan, Do not buy if you plan to use with fan controller!! These fans make a rather annoying ticking type sound between ~ 84-90% voltage. Fan controller I'm using : Aaquaero 5 LT. This would make an okay fan for someone who will run it at 100% continuously.
Currently undervolting them to 7V. Pushing out more air with less noise than my Noctua FLX 140mm fan(ULN adapter). Would buy 4 more for push-pull if it weren't so expensive.
I have 11 of those fans in my Venom build slowed down to about 1500rpm. Rig rans extremely quiet and I don't even speed them up while gaming. Shame fans were discontinued as Scythe and Nidec cannot come to terms of cooperation. Enjoy while it last.