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Thread: Power Consumption




  1. #1
    Join Date
    Dec 2001
    Posts
    31

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    Heya all... i am getting a new server soon.. and was wondering what sort of power supply i would need

    here are the specs:

    AMD Duron 900
    Cheap Graphics card
    Epox 8k7a+ (RAID)
    10/100 Netgear Network card
    Onboard sound

    it is going to have 8 IDE HDD's in it most likely the following:
    4 x 60GB
    2 x 40GB
    2 x 20GB

    would a 300watt power supply be large enough to power all those HDD's??
    MY SYSTEM
    ---------------------------
    AMD XP 1800+ | Epox 8k7a+ | 256 meg PC-2100 CL2 | Leadtek GeForce 3 TDH | 1 x 20GB | 2 x 40GB | 1 x 60GB | 40x16x10 Acer Burner
    3dMarks2001 - 7083

    Member of the TOP 5 @ TT's UD Research Program

  2. #2
    Join Date
    Nov 2001
    Posts
    2,464

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    personally, i would go for 350W-400W or if you budget allows, 450W

  3. #3
    Join Date
    Dec 2001
    Posts
    31

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    what about dual Power Supplies??

    any way to run them without getting a special case?
    MY SYSTEM
    ---------------------------
    AMD XP 1800+ | Epox 8k7a+ | 256 meg PC-2100 CL2 | Leadtek GeForce 3 TDH | 1 x 20GB | 2 x 40GB | 1 x 60GB | 40x16x10 Acer Burner
    3dMarks2001 - 7083

    Member of the TOP 5 @ TT's UD Research Program

  4. #4

    Default

    a case like the DTK u and I have are great for dual PSUs and there is perfect space at the top for a second, u just needa do a little bit o dremel work
    sKuLLsHoT
    www.morb.ath.cx

  5. #5
    Join Date
    Dec 2001
    Posts
    31

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    and how do u hook it up to work properly????
    MY SYSTEM
    ---------------------------
    AMD XP 1800+ | Epox 8k7a+ | 256 meg PC-2100 CL2 | Leadtek GeForce 3 TDH | 1 x 20GB | 2 x 40GB | 1 x 60GB | 40x16x10 Acer Burner
    3dMarks2001 - 7083

    Member of the TOP 5 @ TT's UD Research Program

  6. #6
    Join Date
    Nov 2001
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    4,723

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    The reason a diamond shines so brightly is because it has many facets which reflect light.

  7. #7
    Join Date
    Nov 2001
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    193

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    300W sounds like its plenty enough.
    Onyx

    TweakTown
    OCAU - Overclockers Australia
    CPF - CandlePower Forums

    Antec 1080AMG with 430W TruePower

  8. #8
    Join Date
    Nov 2001
    Posts
    2,329

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    Let's look at some figures:

    Firstly, hard drives only really strain the PSU when they spin up. Always allow the worst case power draw, which is usually around 1 ampere on both the 5V and 12V rail (check the drive to make sure). This equals 17 watts of power, multiplied by 8 = 136 watts.

    The Duron should be chewing around 45 watts, my guess as I'm too lazy to look it up in AMD's whitepapers :D Total so far is 181 watts.

    The motherboard should take around 25 watts, the memory around 20 watts (to be safe). We're up to 226W.

    The graphics card, if it's "cheap" (like a GeForce2 MX/200) should draw around 5 watts (they don't chew much) and the network card should be the same. So the total is just under 250 watts.

    So the answer is yes - 300 watts will be enough, just make sure to choose a quality power supply such as Enermax, but if you can't afford one of them AOpen make rather nice PSU's as well :) Cheaper PSU's, although rated for 300W, may not take that as a sustained load.

    I hope this helps Woody :wave:
    What came first - Insanity or Society?

  9. #9
    Join Date
    Dec 2001
    Posts
    31

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    yeah does help alot :).. will just get a 300 watt power supply :) that should be cool :)
    MY SYSTEM
    ---------------------------
    AMD XP 1800+ | Epox 8k7a+ | 256 meg PC-2100 CL2 | Leadtek GeForce 3 TDH | 1 x 20GB | 2 x 40GB | 1 x 60GB | 40x16x10 Acer Burner
    3dMarks2001 - 7083

    Member of the TOP 5 @ TT's UD Research Program

  10. #10

    Default

    one problem with your math i think...

    a visit to the IBM site has revealed that the drives(i think all Woody's drives are IBM?), on startup use approximately 2A loading on the 12V line, so thats 24W of power per drive, and no specs on the 5V line, but i will go with the assumption that it would be a max loading of 1A (doubt that) and that should equate to29x8 which is 232W

    now, a visit to the AMD site shows us a list of recommended PSUs, i have used the list for the 1600+ bcoz u said u were gunna get that so go here AMD PSU Rec's and look at the huge list... i would like to point out that they actually state the PSU manufacturer rating (ie Aopen 300W) and the "actual" combined power capacity (ie Aopen 300W=200)

    if u take the individual max amp ratings on each v-line available on the PSU do the math on the usable power with those figures...u can work out the true value of the PSU... now the power usage of the 1600+ is something in the ball park of 50W at a guess ( i know theres a util u can get somewhere that can calculate the power usage of a CPU but i can't find it now...)

    now lets take the rough 50W from the cpu, add the other 50W allowance for system devices, and hell, we have hit a grand total of 232+50+50 = 332W used at a startup, now, using your Aopen 300W "Rated" PSU, u r 132W over the true capability of the system when u turn the thing on... okay, so thats turning it on only, but what if we say that the average use we have the equivalent of 7 idle HDs(6 - 8W each) and one full-operation HD (24W) thats (7x7) 49+24=73W for HDs plus 50W for a CPu and 50W for the system, thats 173W, so Then, the lovely 300(200)W psu is happy, until of course u start using several HDs simultaneously...

    i think i have done a full course on this subject now!

    if anyone could post a link to one of them Power calcs for CPUs that'd be great...

    But anyways, get somethin better than 300W, its the bare minimum PSU usually, with AMD...sure it may keep pluggin along as is if u got it, but the life of it is going to be crap all...and a PSU that craps out can be rather ugly, even with the fuses and protection they nearly all have...

    This has been another insightful story from sKuLLsHoT!
    sKuLLsHoT
    www.morb.ath.cx

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