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PSU 8 pin vs 4 pin.

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a b B Homebuilt system
May 20, 2010 7:23:10 AM

Hey guys I built my HTPC today and I'm no POSTing :( 

No case speaker either, I should really get one of those.

My question is this:

I have an OCZ 600W Modular PSU. The non-modular cables are the 20+4, an 8 pin and a 4 pin. My ASUS motherboard only has a 4 pin for the CPU. So I assumed that the 4 pin from the PSU goes into that hole. Every other motherboard I've used, has an 8 pin for the CPU.

So my question is this, was that 4-pin intended for a 4 pin CPU plug? Or should I split the 8 Pin and only use 1 4 pin-half?

I hope this makes sense. But now I'm thinking that maybe the 4 pin from the PSU was intended for something else.

The modular cables are Molex 4-pin, SATA and 2 PCI-E 6 pin cable strings.

Any thoughts?

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a b B Homebuilt system
May 20, 2010 10:29:07 AM

Bump. Just wanted to clarify.

When the motherboard has only a 4 pin CPU power plug, and your PSU has a 4+4 and a 4 pin, is it ok to just use the 4 pin?

I ran through the NO-POST checklist, but without a speaker I stop short of completing it.
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a b à CPUs
May 20, 2010 11:09:00 AM

cmcghee358 said:
Hey guys I built my HTPC today and I'm no POSTing :( 

No case speaker either, I should really get one of those.

My question is this:

I have an OCZ 600W Modular PSU. The non-modular cables are the 20+4, an 8 pin and a 4 pin. My ASUS motherboard only has a 4 pin for the CPU. So I assumed that the 4 pin from the PSU goes into that hole. Every other motherboard I've used, has an 8 pin for the CPU.

So my question is this, was that 4-pin intended for a 4 pin CPU plug? Or should I split the 8 Pin and only use 1 4 pin-half?

I hope this makes sense. But now I'm thinking that maybe the 4 pin from the PSU was intended for something else.

The modular cables are Molex 4-pin, SATA and 2 PCI-E 6 pin cable strings.

Any thoughts?


I took a look at the specs for that PSU and it looks like it does indeed have a 4 pin and a separate 8 pin. This is unusual but they are both labeled as cpu power. Since your motherboard has a 4 pin, it makes no difference which cable you use.
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a b B Homebuilt system
May 20, 2010 11:14:24 AM

Alright I only was unsure because I had never seen a 4+4 as well as a 4 pin. I intentionally withheld that I was using a questionable Phenom IIx4 that I might have fried prevously. I have an Athlon IIx3 on order atm.
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a b B Homebuilt system
May 20, 2010 11:59:51 AM

Best answer selected by cmcghee358.
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a b B Homebuilt system
May 20, 2010 3:09:35 PM

Just an update as I was at work this whole time. I came home and CANN'd my 955 BE out of my 1200 case and slaved it into my HTPC, POSTed immediately. So yeah, the 920 I thought I fried 2 months ago? Definately fried, got a x3 Athlon II being shipped as we speak. Thanks for the reassurance Falcon!
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a b à CPUs
May 21, 2010 5:35:55 AM

Your welcome.
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