There is a built in fan controller that connects to the top panel via the fan hub on the back side of the motherboard tray.
It does 3 different speeds 100%, 70% and 40%. Plug your fans into the fan hub you are good to go.
Where is the fan controller and how do I use it?
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mine makes a weird constant buzzing noise @ 70%, but no noise at 40% or 100%... Phantom 410, stock fans.