Asus MAXIMUS V EXTREME - Manual (Page 66)

1-50 Chapter 1: Product introduction
Chapter 1
12. EZ Plug connectors (6-pin EZ_PLUG_1; 4-pin EZ_PLUG_2)
These connectors provide additional power to PCIe_x16 slots and back IO ports.
Connect a 6-pin power cable to EZ_PLUG_1 when installing multiple display cards
to provide sufficient power supply. Connect a 4-pin power cable to EZ_PLUG_2 to
provide a stable power supply to the back IO ports.
13. Thermal sensor cable connectors (2-pin OPT_TEMP1/2/3)
These connectors are for temperature monitoring. Connect the thermal sensor cables
to these connectors and place the other ends to the devices which you want to monitor
the temperature. The optional fan 1/2/3 can work with the temperature sensors for a
better cooling effect.
You must enable the OPT FAN 1/2/3 overheat protection in BIOS if you connect the
thermal sensor cables to these connectors.
The thermal sensor cables are purchased separately.