Asus RAMPAGE IV EXTREME User Manual page 64

13. EZ Plug connectors (6-pin EZ_PLUG_1; 4-pin EZ_PLUG_2)
The EZ Plug connectors provide additional power to the memory modules and PCI
Express 3.0 x16 slots. Connect a 6-pin power cable to EZ_PLUG_1 when installing four
PCIe3.0 x16 display cards to provide sufficient power supply. Connect a 4-pin power
cable to EZ_PLUG_2 to provide stable power supply to the DIMMs.
14. OC Key connector (10-1 pin OC Key)
Connects to the OC Key device that allows quick on-screen overclocking adjustments.
Refer to section 2.3.12 OC Key device installation for details.
2-40 Chapter 2: Hardware information