If you are talking about the 4pin Molex (D Shaped) connector on the motherboard then I do not believe it is required for normal use.
I have a Maximus IV Extreme-z that comes with 2 of those EZ-Plug2 connectors and as far as I'm aware they are additional power input for use when doing EXTREME overclocking (Liquid Nitrogen and Dry Ice).
That being said I connected mine anyway so I don't have to worry about it later on. It uses a standard Molex power cable from your power supply.
Thanks mate, just read the MOB Manual and on page 2-34 it suggest one uses it to stablize DIMM's - right next to it is a 6 pin ez-plug connector - I assume I WILL need to connect a 6pin VGA cable from my power supply? - as have 2 Gtx 690's!
dosn't do any favours for the asethtics of the build!!!!
The 4 pin floppy power connector for the ram on the Rampage 4 extreme if only required if you need more power for the Ram DIMM's or you are putting ram in all 8 ram slots
I believe it discusses this in the RIVE manual
If you are doing this then most power supplies have a floppy connector in the end of normal molex cables or u can buy a Molex to floppy adapter