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4 pin 12v connector on 8-pin 12v motherboard

Hi all,

I'm building a new machine with a Gigabyte GA-P55-USB3 motherboard and it won't POST.  The beep codes indicate a power problem.  The PSU is 500W, which should be ok, but it has 4-pin 12V connector for the CPU, whereas the motherboard has an 2x4 pin socket for same.  The 4-pin fits in one end of this 8-pin socket, but it won't POST which leads me to believe I either need a different PSU or some kind of adapter.  

Anyone any ideas?

Thanks in advance.
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1 Solution
You are correct, this motherboard requires a "2.1 x 8-pin ATX 12V power connector" from the PSU. I did find 1 adapter that should work: http://www.xoxide.com/tt-psu-adaptor-cables.html but it has 2 cables total, one you won't need but still fairly cheap vs buying a new PSU. Good luck.
You have plugged a 4 pin power source into a motherboard that requires an 8-pin power source. This clearly isn't going to work, you haven't provided the motherboard with the power it needs to work.

So yes you'll need a PSU that has an 8-pin motherboard power plug.

Before you buy an adapter cable, make sure of the power requirements for your video card. This board can take some powerful cards and that may require a new psu anyway. Thanks
mark_D74Author Commented:
@ Frosty555  I've seen references to mainboards with 8-pin 12v sockets which allow you to plug a 4-pin plug into one side so it's not quite as clear-cut as that.  

@ richardcardin That's a good point, the 500W one I have isn't a branded one and wasn't expensive so I think a new and more powerful one (with the right connections) is in order.

Thanks for the help.
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