Problems splitting single power supply for two motherboards

[mooseracing]

I bought a ATX 20 pin to two 20 pin splitter off an ebay store. I'm guessing my problem is somethere in the wiring standards between 24 and 20 ping.

I'm trying to use a single 350watt pc to run two min-itx boards. The boards are 20 pin or 24 and the PS is 20 pin. Anytime I plug it into the boards they both come on. One board will boot the other will start to boot and the video then goes out half way into windows.

I can't believe these boards are overpowering the PS, as I doubt both together draw over 100 watts. Do I need a 24 pin to acommplish this? Over here this one is made- http://www.overclock.net/faqs/...ower-supply-power.html and can power the computer up individually.

What am I missing here?

 

[Quiksilver]

Your post needs clarification because you keep mentioning both 20 and 24 pin parts. Also are the boards 20 pin or 24 pin cause it sounds like you don't even know :\

 

[mooseracing]

Originally posted by: Quiksilver
Your post needs clarification because you keep mentioning both 20 and 24 pin parts. Also are the boards 20 pin or 24 pin cause it sounds like you don't even know :\

I bought a ATX 20 pin to two 20 pin splitter off an ebay store.. The boards are 20 pin or 24 and the PS is 20 pin.

The board accept both, it's your choice what to use. The PS that came with my 1u case is 20 Pin. The splitter I am using goes from 1-20 pin to 2-20 pin connectors.

 

[jonnyGURU]

Originally posted by: mooseracing
I bought a ATX 20 pin to two 20 pin splitter off an ebay store. I'm guessing my problem is somethere in the wiring standards between 24 and 20 ping.

I'm trying to use a single 350watt pc to run two min-itx boards. The boards are 20 pin or 24 and the PS is 20 pin. Anytime I plug it into the boards they both come on. One board will boot the other will start to boot and the video then goes out half way into windows.

And just to be sure... the boards do work independantly of each other when you're NOT trying to run both off of one PSU, right?

Originally posted by: mooseracing
I can't believe these boards are overpowering the PS, as I doubt both together draw over 100 watts.

Depends... how crappy of a 350W PSU is it? If it's something good, fine. If it's a hunk of crap it may only be able to supply a couple hundred watts. Keep in mind that boot up actually takes a lot of power. To experiment, you might want to just try a bigger PSU to see if the problem can be duplicated.

Originally posted by: mooseracing
Do I need a 24 pin to acommplish this? Over here this one is made- http://www.overclock.net/faqs/...ower-supply-power.html and can power the computer up individually.

What am I missing here?

Enough power? You don't need 24-pins to accomplish this. If the motherboard required it, it wouldn't even post. You're posting and starting to boot, so you know you're good with the 20-pin and that there's enough voltage on the PWR_ON and PWR_OK leads.

 

[mooseracing]

Originally posted by: jonnyGURU
And just to be sure... the boards do work independantly of each other when you're NOT trying to run both off of one PSU, right?

Yep they both work fine on seperate PSU's.....



Hopefully I can try a bigger PSU tonight but I ran into some issues with the SATA headers not seeing my hard drive, yay. Luckily it's still within the 30 day period.

I need to pick up something to measure the power draw on these, IIRC both clamied less than 30 watts, add 2 hard drives to the mix, and 2 sticks of ram, I can't see them pulling more than 150 together at startup. The wires aren't getting warm, so I'm not working it too hard.

But The dieing halfway into windows make me think low voltage, even though the other board continues to work fine...just puzzling.