Tom's Hardware > Forum > Homebuilt Systems > General Homebuilt > 4-pin or 8-pin plug for CPU power? Q9550

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

Forum Homebuilt Systems : General Homebuilt - 4-pin or 8-pin plug for CPU power? Q9550

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cortright   09-12-2008 at 09:01:45 PM

I'm assembling a PC with a ASUS Rampage Formula motherboard ( http://www.newegg.com/Product/Prod [...] 6813131284 ) and a Q9550 Processor ( http://www.newegg.com/Product/Prod [...] 6819115041 ) with an Antec Truepower Quattro 1000w PSU ( http://www.newegg.com/Product/Prod [...] 6817371012 ).

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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IH8U   09-12-2008 at 09:22:04 PM
- 0 +

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.

Reply to IH8U
nocteratus   09-12-2008 at 09:22:52 PM
- 0 +

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.

Reply to nocteratus
terror112   09-12-2008 at 09:39:47 PM
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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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