Tom's Hardware > Forum > Motherboards & Memory > General Motherboard > 4pin not on motherboard
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wingfan1991   06-24-2009 at 09:32:25 PM

im replacing a power supply on a system and it doesnt have a 4pin only the 20 pin.. the new power supply has both 20 and 4 pin. will using ONLY the 20 pin power up the board not causing any issues? the board is easily 8 years old.

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DXRick   06-24-2009 at 09:39:06 PM
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Of course! You just use the 20 pin one.

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photonboy   06-24-2009 at 10:29:26 PM
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Agreed.
The extra 4-pin connector is for newer demands. As you know by now the "24-pin" can split into a 20-pin and 4-pin connector.

I'm not certain but I think the 4-pin connector is for newer CPUs. It's easily googled, but the question has been answered.

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badge   06-24-2009 at 10:44:27 PM
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The 20 + 4 pin was needed to supply more 12v ground and source of 12v for modern more power hungry video cards addressing PCIE in particular. OP what DXrick said.

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royalcrown   06-24-2009 at 10:47:33 PM
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Pretty sure it was more for the CPU vrms badge, but I may be incorrect,,,

------------------------------ E8500,GA-EP45-UD3R, 8 GIG MUSHKIN, XFX 4890 , ASUS 22", WD 640 X 2, CM 532, CM 650TX
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badge   06-24-2009 at 10:52:26 PM
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The 12v into the MB is just that 12v nothing more nothing less. The added 4 pin connector is basically an added ground plus add source of the same 12v power. Whatever you say.

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badge   06-24-2009 at 11:12:24 PM
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I believe when PCIE took over from AGP, the additional 12v 4 pin was added to the 20pin at that time.

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