20pin atx connector to 24pin motherboard

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20pin atx connector to 24pin motherboard

Postby 386SX » 2017-12-05 @ 18:51

Hi,
I'm trying some different 20pin power supply on a 24pin motherboard (supporting dual core intel / ddr2) leaving the last 4 pin of the mobo connector obviously open. I read somewhere that beside some heavy power requirements it should still boot so I used a 1,65ghz low power dual core cpu but no way, the fan seems to move a bit and then it stops.
Do you think I still need a 24pin power supply or I can use these P4 20pin ones anyway? Or I need the converter cable?
Thank
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Re: 20pin atx connector to 24pin motherboard

Postby LR35902 » 2017-12-05 @ 19:05

Just to be sure, is there a 4 pin cpu power connector on the board?
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Re: 20pin atx connector to 24pin motherboard

Postby 386SX » 2017-12-05 @ 20:07

LR35902 wrote:Just to be sure, is there a 4 pin cpu power connector on the board?

On the mobo there's the usual 24pin atx connector and separately the 4 pin 12v connector too. ;)
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Re: 20pin atx connector to 24pin motherboard

Postby havli » 2017-12-05 @ 20:14

Yes, 20pin will work just fine.
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Re: 20pin atx connector to 24pin motherboard

Postby 386SX » 2017-12-05 @ 20:18

havli wrote:Yes, 20pin will work just fine.

This make me think something is wrong with the mobo cause there's no way. I tried also a powerful Enermax 20pin for Athlon XPs.
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Re: 20pin atx connector to 24pin motherboard

Postby 386SX » 2017-12-06 @ 10:48

It looks like there's something wrong with the board a MSI MS-7525 on socket 775. With a 24pin power supply it still can't boot. The fan move a bit and then stop.
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Re: 20pin atx connector to 24pin motherboard

Postby .legaCy » 2017-12-06 @ 12:25

The 4 pin power connector that sits right next to the cpu is connected right?
Just to be sure that is connected properly you can wiggle it in a little bit.
Is there anything that may cause short circuits like those metal stand offs in the case?
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Re: 20pin atx connector to 24pin motherboard

Postby 386SX » 2017-12-06 @ 16:08

.legaCy wrote:The 4 pin power connector that sits right next to the cpu is connected right?
Just to be sure that is connected properly you can wiggle it in a little bit.
Is there anything that may cause short circuits like those metal stand offs in the case?

The connector is stable and the mobo is outside the case with just the cpu and ram. Maybe some components failed and causing this?
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Re: 20pin atx connector to 24pin motherboard

Postby SW-SSG » 2017-12-06 @ 18:11

It does sound like something on the board is shorted.

Without the 4-pin ATX12V attached, it should power on (fans spinning and etc) but not POST... at least in my experience.
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Re: 20pin atx connector to 24pin motherboard

Postby .legaCy » 2017-12-06 @ 19:26

386SX wrote:
.legaCy wrote:The 4 pin power connector that sits right next to the cpu is connected right?
Just to be sure that is connected properly you can wiggle it in a little bit.
Is there anything that may cause short circuits like those metal stand offs in the case?

The connector is stable and the mobo is outside the case with just the cpu and ram. Maybe some components failed and causing this?

Well maybe failing mosfets or mosfet drivers, if you can diagnose the vrm part of the board.
This happened to me twice, one was a shorted motherboard(thankfully the psu protection prevented the motherboard to be fried, removing the short brought it back) and other was bad fets on the board.
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