In your video "How to Connect Multiple Case Fans" this shows you connecting the three wire fan connector directly to the power supply, connecting the red to red, yellow to yellow and black to black. However in researching this online I have found that the three wires on the fan connectors are red for +12V yellow for sense and black for ground. When connecting directly to the power supply the yellow wire is not used only need the red connected to the yellow for the 12V and the black connected to the black for ground. The yellow sense wire is only used when connecting to the motherboard.
So the information in this video is incorrect.
So the information in this video is incorrect.