My fan is rated at 12V, 0.68A. I bought this power supply https://www.amazon.com/gp/product/B01CFJH2U4/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1 since it has multiple output voltages and is rated at 30W. So, at 6V, it can put out 5A. Obviously, I didn't need that much, but I wasn't sure and I...