Asus Z8PH-D12 SE/QDR - Manual (Page 33)

ASUS Z8NH-D12 Series 2-15
3. Repeat steps 1 to 3 to install the other heatsink if you have installed a second Repeat steps 1 to 3 to install the other heatsink if you have installed a second
CPU, then connect the fan cable to another 4-pin connector.
3. Connect the fan cable to any of the the 4-pin connectors.