4-pin or 8-pin plug for CPU power? Q9550

I'm assembling a PC with a ASUS Rampage Formula motherboard ( http://www.newegg.com/Product/Product.aspx?Item=N82E16813131284 ) and a Q9550 Processor ( http://www.newegg.com/Product/Product.aspx?Item=N82E16819115041 ) with an Antec Truepower Quattro 1000w PSU ( http://www.newegg.com/Product/Product.aspx?Item=N82E16817371012 ).

The motherboard CPU power port has a 4-pin connector exposed by default, but there's a dust-cover over an adjacent 4 pins that would make it 8-pin. I've gone through my documentation for my CPU, motherboard, and PSU... but I do not see where it is specified whether I should be using a 4 pin plugin or an 8-pin.

Can someone help out with which I should be using? And where would this be documented in my manuals?
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  1. I'd go ahead and plug in the 8 pin (removing the dust cover first of course). I think the 4 pin is used for older CPU's (P4's), and extreme low power ones.
  2. If you have a 8-pins on your PSU use the 8-pins instead of the 4-pins...

    If your PSU only has a 4-pins use the 4-pins.
  3. I believe the 8 pin was originally designed for p4's (Prescott etc), now they just use it for high end quads to take some load off of the 24pin motherboard connector.
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