Electronics Can one PSU power two motherboards?

Discussion in 'Modding' started by shinx, 22 Oct 2008.

  1. shinx

    shinx Modding Newbie

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    Can anyone provide me with a definitive answer about the possibility of one psu serving 2 mobo? I know you can get a 20/24 pin y cable...
     
  2. IanJackson

    IanJackson Photographer & Modder

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  3. shinx

    shinx Modding Newbie

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    I get your point... though Corsair tech guys say to me -

    If i use an atx24 splitter cable enabling the psu to power both motherboards do you see any issues that may arise?

    Technical Support Yes, the power regulator/controller is on the motherboard, not in the PSU. Having two regulators/controllers trying to control single PSU unit may lead to various issues.
     
  4. IanJackson

    IanJackson Photographer & Modder

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    i think it might work but if they were running of the same rail there might be a problem i havent tried it. can u post a pic of the splitter?
     
  5. mvagusta

    mvagusta Did a skid that went for two weeks.

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    um Shinx, Why?
     
  6. craigbru

    craigbru Cramming big things in small boxes since 2006

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  7. GavX

    GavX What's a Dremel?

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    Hate to be Cpt. Obvious, why not just have 2 PSUs? If need be your current one and power all graphics card etc off that, assuming it is powerful and has the connections, and a cheap-ish Corsair etc to just power the motherboard on your second PC. Just a though, as 1 PSU will most likely not be able to even if you could, the way the amperages and what not as layed out
     
  8. Moriquendi

    Moriquendi Bit Tech Biker

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    Because corsair want to sell you two PSUs???

    I've seen it done a couple of times, IIRC only one mobo has the ability to turn on the PSU though.

    Moriquendi
     
  9. stuartwood89

    stuartwood89 Please... Just call me Stu.

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    Are you trying to run two ATX motherboards in one case, or are you trying the more popular ATX and PicoITX combo? If it's the latter, then using a splitter shouldn't be too much hassle, as the Pico would draw so little power compared to the ATX. Alos consider the PicoPSU if that's what you're doing.
     
  10. shinx

    shinx Modding Newbie

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    thanks for the replies - sorry I havnt been able to respond before.

    I intend to build a 'double mobo' HTPC (an Asus P5E-VM HDMI and an XBox 360 board) all inside a NZXT Rogue with the Xbox forward of the Asus under the drive bays. Hence I need to solve the psu issue as regarding one or two with both as out of the way as possible.

    Istar make a psu suitable to power the Xbox 360. I need 16.5A on 12V and 1A on 5V, the TC-1U/40 400W PSU will meet that they tell me and its not too big.

    It increasingly looks like I will need two units.

    Splitter - http://www.atxpowersupplies.com/atx-20-pin-y-splitter.php

    also - http://www.cyberresearch.com/store/cables-wiring/power-cords-cables/CBL_ATXY12_3506.2.htm
     
    Last edited: 24 Oct 2008
  11. jokkos

    jokkos too busy to mod *sigh*

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    you can buy PicoPSU for the Xbox mobo, it's nice and small so you won't lose a lot of space. And it has more then enough power. Take a look here (link)
     
  12. shinx

    shinx Modding Newbie

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    seriously? did you use one? i must check if it will supply enough power, need to be sure, looks good... have to say its power does look low but then it has to be connected to a conventional psu to get its 12v in the first place. So i wonder how much the xbox mobo receives compared with what it actually needs... am contacting mini-box...
     
    Last edited: 24 Oct 2008
  13. jokkos

    jokkos too busy to mod *sigh*

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    yeah it depends on what the xbox board needs. Not so much the total wattage, that should be alright imo. But the 5V, 12V power it needs. Those pico-psu's are really nice, I'm using one in my HTPC. That needs about 95W at full load and that's no problem at all for the psu.
     
  14. shinx

    shinx Modding Newbie

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    I need 203w / 12v DC @ 16.5A / 5v DC @ 1A - the PSU must be able to provide this much (SUSTAINED) power (AT A MINIMUM) so awaiting what pico will tell me..
     
  15. jokkos

    jokkos too busy to mod *sigh*

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    wow I had no idea an xbox board needs that kind of power? 203w? That won't be possible with a pico-psu. I don't think it'll put out 16.5A @12V either.
     
  16. shinx

    shinx Modding Newbie

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    Mini-box - '...The strongest power supply we have can provide up to 300W peak (M4-ATX). I have attached the manual for the M4-ATX power supply. Hope this will help...'

    This is for a carputer.... so i am reasking them again if it can supply the sustained power... - may decide to go with a TC-1U/40 400W from Istar.
     
    Last edited: 27 Oct 2008
  17. slipperyskip

    slipperyskip Member

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    I use a PicoPSU to drive a Core2 Duo T5600, 2GB DDR2-667, an NVIDIA GS7600, a 3.5" HDD and a DVD burner with no problem.
     
  18. liratheal

    liratheal Sharing is Caring

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    Let me try and understand what you're trying to do.

    You're wanting to build a PC and a 360 into the same box?

    If so - I'd have thought you'd be best researching the input voltages, amperages etc, for the 360, then buying a dead PSU off eBay or something, and cutting the connector off, as that's all you need, and then rigging it up so you can turn one on and not the other.

    It'd not be easy, I'm an electrical newb though, so I can't easily think of a way to do it.
     
  19. shinx

    shinx Modding Newbie

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    Correct. I know the voltages/amps etc required. And finding a Y connector is not a problem. I want to be sure and not destroy mobos powering from one psu + sure they will function correctly all the time. Also I dont want the power lead from the xbox to fry inside the case as others have found when powering it from any old ATX psu.
    Corsair have said - the power regulator/controller is on the motherboard, not in the PSU. Having two regulators/controllers trying to control single PSU unit may lead to various issues.

    PS looked at your web site - beautiful and creative work there...
     
    Last edited: 27 Oct 2008
  20. shinx

    shinx Modding Newbie

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    Update

    Have decided 2 psus it has to be. PCPower have a 1U 300w psu that has the outputs the 360 Falcon motherboard needs. Should just be the right size to fit in rear of the Rogue under the existing psu space (on its side) with enough air space around it...
     

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