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Thread: Multiple boards using 1 PSU, how?

  1. #1
    YUKIKAZE arthurleung's Avatar
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    Multiple boards using 1 PSU, how?

    Planning to build a small server farm for myself with a couple of low-end quad cores. I wonder if it is possible to hook up something like 3-4 motherboards to the same PSU? And where I can buy the splitters for it? These system won't use more than 200W and I want to power them with a 850W PSU which only cost a tad bit more than a 650W and certainly less than two 450W one.

    And is there any thing that need to check before making a system like this?
    Workstation 1: Intel i7 950 @ 3.8Ghz / X58 / 12GB DDR3-1600 / HD4870 512MB / Antec P180
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  2. #2
    Anthropomorphic Personification shaithis's Avatar
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    Re: Multiple boards using 1 PSU, how?

    Yes you can, unfortunately I haven't seen a UK stockist for the splitters.

    Plenty in the US though.....although I wonder about how they would work TBH. Might end up frying something.
    Main PC: Asus Rampage IV Extreme / 3960X@4.5GHz / Antec H1200 Pro / 32GB DDR3-1866 Quad Channel / Sapphire Fury X / Areca 1680 / 850W EVGA SuperNOVA Gold 2 / Corsair 600T / 2x Dell 3007 / 4 x 250GB SSD + 2 x 80GB SSD / 4 x 1TB HDD (RAID 10) / Windows 10 Pro, Yosemite & Ubuntu
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  3. #3
    Admin team peterb's Avatar
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    Re: Multiple boards using 1 PSU, how?

    you would need to be very careful about how the individual rails of the PSU are loaded. Remember that the power rating of a PSU is aggregated across all the power rails, so (for example) the CPU is taking 20 amps at 3 volts (60 Watts) a 240 watt PSU would not drive 4 CPUS simply because it couldn't supply 80 Amps, even though on paper that is 240W.

    If you were planning to run multiple mobos off one PSU, you would probably use separate dedicated PSUs for each rail - so you would use a 3V PSU (for example) rated at 80 amps for the CPU supplies, and separate units for hard drives and other peripherals. You may need some decoupling between the boards as well.

    I'm not saying that using a single PSU isn't possible, just that it may not be as straightforward as it first seems.
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    Gentoo Ricer
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    Re: Multiple boards using 1 PSU, how?

    I think a 850W would easily do it. But I'd run it by the numbers. Stick with single rail PSUs too.
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  5. #5
    Anthropomorphic Personification shaithis's Avatar
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      • CPU:
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    Re: Multiple boards using 1 PSU, how?

    Main PC: Asus Rampage IV Extreme / 3960X@4.5GHz / Antec H1200 Pro / 32GB DDR3-1866 Quad Channel / Sapphire Fury X / Areca 1680 / 850W EVGA SuperNOVA Gold 2 / Corsair 600T / 2x Dell 3007 / 4 x 250GB SSD + 2 x 80GB SSD / 4 x 1TB HDD (RAID 10) / Windows 10 Pro, Yosemite & Ubuntu
    HTPC: AsRock Z77 Pro 4 / 3770K@4.2GHz / 24GB / GTX 1080 / SST-LC20 / Antec TP-550 / Hisense 65k5510 4K TV / HTC Vive / 2 x 240GB SSD + 12TB HDD Space / Race Seat / Logitech G29 / Win 10 Pro
    HTPC2: Asus AM1I-A / 5150 / 4GB / Corsair Force 3 240GB / Silverstone SST-ML05B + ST30SF / Samsung UE60H6200 TV / Windows 10 Pro
    Spare/Loaner: Gigabyte EX58-UD5 / i950 / 12GB / HD7870 / Corsair 300R / Silverpower 700W modular
    NAS 1: HP N40L / 12GB ECC RAM / 2 x 3TB Arrays || NAS 2: Dell PowerEdge T110 II / 24GB ECC RAM / 2 x 3TB Hybrid arrays || Network:Buffalo WZR-1166DHP w/DD-WRT + HP ProCurve 1800-24G
    Laptop: Lenovo Flex 2 / 12GB RAM / 240GB Corsair Force 3 Printer: HP CP1515n || Phone: HTC One U11 || Other: Samsung Galaxy Tab 4 Pro 10.1 CM12.1 / Playstation 4 + G29 + 2TB Hybrid drive

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