If you'd notice, all connectors are color coded to easy distinguish where each connector goes. Black = pumpOrange = AIO fanWhite = CPU fan (if present)
In looking at the placement of the cable from the heat sink (I have the aoi water cooled version) I find it odd that the one board hookup is going to fan1 instead of CPU fan on the Mobo. Is this done in error or on purpose? I would think to properly regulate the CPU, the CPU radiator fan should be hooked up to the CPU fan and not fan1 on the Mobo.  Others notice this? [IMAGE]  
XPS 8950, CPU fan mobo connection