I had to order a molex 30cm adapateur to 3 pin female, Pc-look - Molex Power Adapter - 1F (4p) / 1F (3p), to be able to switch from 12v to 5v, with a 3 pin male adapter 4 Pc-look plug - Molex adapter - PC-MX1 - 1M (4p) / 2M (3p-12V) + 2M (3p-5V).
And here we find the silence without losing too much cooling.