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Thread: Power brick watts for thin mini-ITX build?

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    Default Power brick watts for thin mini-ITX build?

    I'm trying to make tiny, yet powerful (CPU wise) build, based on Asus H81T motherboard.
    I already have SODIMM-s and mSATA from my NUC that I'm currently using at home, so I need to buy CPU, case and power adapter.
    I will buy the case last, since I have a test bench, and I will leave the system there until I find the one that I like, but I still need to buy CPU and power brick.
    Although I know power brick type that I need (19V+/-10%, 7.4mm-5.0mm), I'm not sure on the wattage (which depends on chosen CPU).

    I can get 90W, 120W, 135W, 150W, 180W, 200W or even 230W (all HP original power bricks), but I'm not sure whether ones above 180W will somehow damage the board,
    or which one will be enough for running i7-4790 or i7-4790S. I need to mention that this build has no discrete graphics, uses 2 modules of DDR3L on 1.35V and only mSATA as storage device.

    Can someone help me choose the right power brick? Will 180W be enough for 4790 under load? I already asked this question on one other forum, and people told me that 180W will do just fine. Do you agree?

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    Why would a higher wattage brick damage the motherboard?

    Power supplies only supply the power that is demanded of them.

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    Quote Originally Posted by gotrunx View Post
    Will 180W be enough for 4790 under load?
    What does "load" mean, in your case? Because probably even half that wattage will be enough.
    Best, Luca

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    A power brick puts out 19v. Can 12v equipment handle that?
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    Quote Originally Posted by ehume View Post
    A power brick puts out 19v. Can 12v equipment handle that?
    Intel "thin mini-ITX" specs expect a 19V power source, Ed (according to the Intel DQ77KB manual is 19V ±10%, 12A max, in a 7.4mm x 5.1mm DC plug, GND outside, 19V inside).
    Best, Luca

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    Quote Originally Posted by jonnyGURU View Post
    Why would a higher wattage brick damage the motherboard?
    Power supplies only supply the power that is demanded of them.
    I understand that, but I've read somewhere that board has current limit of ~10, 11A, so if components potentially "pull" 230W and power brick can supply it, could that potentially damage the board?

    230W / 19.5V ~= 12A (right? )

    Quote Originally Posted by quest for silence View Post
    What does "load" mean, in your case? Because probably even half that wattage will be enough.
    I don't play video games at all. I do some .NET programming at home and sometimes I overuse the TPL so the CPU get's really busy.

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    For something to start pulling that much power, you have a short from a failed part... which means something is already damaged. But you're correct. It's like the whole single vs. multiple +12V rail argument. The more power that's available during such a failure, the more damage that can occur.

    That said... you are talking about the absolute worst case scenario.

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    Quote Originally Posted by gotrunx View Post
    I don't play video games at all. I do some .NET programming at home and sometimes I overuse the TPL so the CPU get's really busy.
    More probably that not, you're going to draw 120W peak at most (my guesswork is based upon power consumption figures of several tasks like either Cinebench R15 multi threaded mode rendering, or x264 parallel transcoding, or eventually mersenne numbers calculation with Prime95).
    Best, Luca

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    Alright then, I guess I'll go with 180W which will be significantly more than enough for 4790S, but still be within board's operating window even if it somehow goes "at full capacity". Thanks guys.

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