The #Bitaxe 601 Gamma does not utilize the old 4 pin fan connector that previous Bitaxe board versions did.

The Bitaxe 601 Gamma utilizes a micro 4 pin connector (to the left of the red circle), which is not compatible with current Noctua fan connector options. @solo_mining is currently working with Noctua for a solution.

As a workaround, users have been soldering the Noctua wires to the spot on the PCB where the old 4 pin connector use to be (circled in red).