[Shinigami]

Hi francis,


Thank you very much for your message. I just tested the same thing with 2 of my fans (2 different batches).

Spin up was at 5.5V but I was running them at 5v=400rpm, 9v=900rpm. Once you lowered the rpm and go up again it feels that the increase of voltage around 9v is growing only slow, but the rpm are picking up constantly and don't jump uncontrolled. The range between 9 and 10v is bigger, it is 900-1500rpm, which I could increase and decrease steady, nit a big problem on my side. I was using the Kaze Master 5,25" black for the test, to simulate it.

You seem to have tested it pretty often with different control devices. So my guess is that you have the lucky one, which you should replace. If you are from Germany, we can do direct RMA Procedure. Otherwise please contact the shop and send them this link, as it is involving us as the manufacturer as well and It was my advise after all.