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Thread: For the sake of an argument: 500w enough for 38 HDDs? 1KW for 76 HDD's?

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    Default For the sake of an argument: 500w enough for 38 HDDs? 1KW for 76 HDD's?

    Okay guys, I know the awnser to this question, however, I would like to get a collective response from you all and especially JonnyGURU.

    I know a guy who is planning on loading his machine up with drives, high end components, and is pretty lofty in his goals, however he wants to use one power supply. When I mentioned to him that he has to check his power consumption, he got all defensive and said to determine the PSU needed all he has to do is add up all the wattage consumption and thats the PSU he would need (so 13w per drive = 500w psu = 38 Hard drives).

    Lets assume that we are using high quality PSU's and the drives are regular sata 7200rpm drives.

    Anyways,

    Whats the feasibility of:

    500w PSU = 38 Hard Drives?
    1000w PSU = 57 Hard Drives?
    1000w PSU = 32 Hard Drives (SAS and SATA, +Dual Quad Xeons (8way), +dual 8800GTX's, +loads of memory, etc).


    Just wanted your oppinions.

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    That'd be great if it was a 500W 12V PSU but sadly that's hardly the case. For 38 hdds I'd suggest no less than a 1KW unit unless he has a raid card that can be configured for staggered spin up.

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    I can't remember where, I think the PC Power & Cooling website, but I read that HD's have this "spin up" when you first turn the computer on, and that a typical HD uses 300% more power in spin up then when it's stabalized.

    So unless this guy has a PS with some great peak power that lasts for a few seconds, I'd say noo....

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    Quote Originally Posted by Ockie View Post
    Okay guys, I know the awnser to this question, however, I would like to get a collective response from you all and especially JonnyGURU.

    I know a guy who is planning on loading his machine up with drives, high end components, and is pretty lofty in his goals, however he wants to use one power supply. When I mentioned to him that he has to check his power consumption, he got all defensive and said to determine the PSU needed all he has to do is add up all the wattage consumption and thats the PSU he would need (so 13w per drive = 500w psu = 38 Hard drives).

    Lets assume that we are using high quality PSU's and the drives are regular sata 7200rpm drives.

    Anyways,

    Whats the feasibility of:

    500w PSU = 38 Hard Drives?
    1000w PSU = 57 Hard Drives?
    1000w PSU = 32 Hard Drives (SAS and SATA, +Dual Quad Xeons (8way), +dual 8800GTX's, +loads of memory, etc).


    Just wanted your oppinions.
    Tell him to try it because it will be funny to see the look on his face when nothing works

    I'd be surprised if 1kw would do 38hard drives plus dual xeons dual 8800s plus memory and mobo. That sure is asking a bit much.
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    What is the feasibility....about 0....and that is just for the 38 drives.

    First how are you acutally going to house these drives? How many raid arrays are you going to use? How are you going to cool them?

    Then there is the problem of powering them. Even with a 1kw PSU and staggered spinup...there is no way I would entrust that many drives to one failure point even if it would work (which it probably won't ever). Bad bad mojo.

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    Most any 3.5" hard drive will use just over 36W on spin up. 3A on the 12V rail.

    I've confirmed this myself. 13W? I wish. That's a regular read/write draw.

    So, unless you stagger the spin up, I wouldn't suggest anything with less than 1368W on the 12V rail. Good luck with that!

    If he used 2.5" drives, he moves his load over to the 5V rail AND the spin up draw is about half that of a 3.5" drive, but....

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    Thanks guys, this was the expected general opinion I was looking for.

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    Quote Originally Posted by jonnyGURU View Post
    Most any 3.5" hard drive will use just over 36W on spin up. 3A on the 12V rail.

    I've confirmed this myself. 13W? I wish. That's a regular read/write draw.

    So, unless you stagger the spin up, I wouldn't suggest anything with less than 1368W on the 12V rail. Good luck with that!

    If he used 2.5" drives, he moves his load over to the 5V rail AND the spin up draw is about half that of a 3.5" drive, but....
    Ultra has the 2k X3 coming out
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    Jonny's got that Ultra 2KW psu too :-p

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    The question is though, how the hell do you hookup 38 HD's to one PSU? What psu has 38 4 pin connectors?

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