[Def]

My MagDrive 5 is nearly silent when all the air is out of the system. I can hear a nice purring sound if I put my ear right up to it, but when I get just 2 feet away I really cannot hear the pump at all. This is in a silent room btw. The vibration will make noise if you don't isolate it, so get some rubber to set it on.

I did seal my pump with Blue RTV Sealant, but the first time didn't do so well. I just got my waterblock today and I've been messing with my system some. I kept getting air into the lines, and I'm pretty sure it was the housing. So I just cleaned it off with alcohol this time and redid the RTV and it looks like it'll be sealed up nicely.

Not sure if it leaked when I first got it. I did some preliminary testing with it and it didn't, but I figured why take a chance if I can seal it really well now.

The impeller does in fact rotate on the shaft, but it doesn't really cause any noise(that I can tell). I have heard of some people having trouble to get their pumps to initially turn over when attaching the impeller to the shaft. I think these little motors don't develop much torque so they need that extra 180 degrees to get "wound up".