What would you use two PSU's for? and why all the 5.25bays?

Discussion in 'Newbie Lounge' started by Original Daniel, Apr 17, 2013.

  1. Original Daniel

    Original Daniel Member

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    I was just watching the Corsair 900D unboxing from Linus and the case has room for two PSU's and i wonder what would you need that for? I didn't know you could use two power supply's on a single setup?

    2nd question: Why do cases have so many 5.25" bays when i only ever see people use 1 for a DVD drive and most of the enthusiasts don't use internal DVD drives anymore so whats the point of putting 3 to 5 5.25" bays when nobody seems to use more than 1?
    I mean i get that you can use up all the extra space for fan controllers and such but it looks like enthusiasts prefer to control fans and such from software so whats up with that?
     
  2. SiriusDragon

    SiriusDragon Member

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    I use 2 power supplies as I have 4 x GTX 480s. One PSU won't handle 4 x overclocked 480s + an overclocked CPU + all the other crap in the case. PSUs tend to perform better when they're not 100% loaded all the time :)

    As for how it works, you basically get a dongle that causes the 'primary' PSU to trip on the 'secondary' PSU at the same time.
     
  3. Rory K

    Rory K Member

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    The reason so many cases have so many 5.25" bays is that they're incredibly versatile. You can stick a DVD drive, fan controller, reservoir in, or mount a 3.5" adapter for floppies (lol), or even just use them internally, e.g. 5-in-3 HDD bays, radiators, etc.
     
  4. garetz

    garetz Member

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    You use 2 power supplies to split the load, the reason there is so many bays is to give you flexibility, instead of using the case just for a pc, you can use it as a 10-12 disk server if you wish or many other things.
     
  5. OP
    OP
    Original Daniel

    Original Daniel Member

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    Hm fair enough i can see how trying to power that would require two PSU's aren't the GTX480s the most power hungry cards at the moment? Would say 4x 7970/680s work on a single 1200W PSU?
    Wouldn't having some power going to the 2nd PSU cause problems?

    Ah i can see now how they'd be useful,
    I imagine making a midtower case with one 3.5"bay would be cheaper and gives more room for HDDs also making it useful as a cheap mass storage case.
    Also seems the more common budget/gamer rigs typically have a couple 120/140mm fans and a single or duel 120mm closed loop water cooler like the Corsair h80/h100s, rarely using more than a single 5.25bay so it just puzzles me why there isn't a couple cases designed like that as those builds seem like the norm.

    Like i said above i just find it odd that there isn't at least a couple cases designed in a way that is cheaper because it has basic features yet still has the features needed for a common budget/gaming setup.
     
    Last edited: Apr 17, 2013
  6. SiriusDragon

    SiriusDragon Member

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    Power feedback? That doesn't seem to be an issue.

    4 x 680s is doable, not sure about 4 x 7970s though as those (especially GHz edition cards) draw about as much as a 480. It'd probably be fine for stock but if you OC too much you may have stability issues.
     
  7. Davo1111

    Davo1111 Member

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    1)

    - large system including pumps, multiple graphics cards or a tonne of hard drives.
    - You have salvaged 1 psu already which is working fine, so you get a second one as a slave
    - Some type of power efficiency thing (maybe 2 500w psu's is more efficient that 1 1000w psu).
    - price - in the past the high end psu's have been significantly more expensive than 2 half cpus.

    2)

    - waterblock/temp controller
    - dvd drive (some people might back up and have multiple drives)
    - card readers etc
    - access to drive bays (hot swap)
    - extra usb ports

    https://www.pccasegear.com/index.php?main_page=index&cPath=408

    3)

    depends on what you like.
     
  8. S-Kimo

    S-Kimo Member

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    I've got 3 480's running off a HX1000 and i can confirm that they are the most power consuming, heat producing card ever :D
     
  9. cbb1935

    cbb1935 Guest

    Didn't even realise these cases existed (outside of the Server chassis's).

    Anyway part the reason OCAU is great.

    This could be VERY handy for self built servers.

    Anyone know if the case comes with the psu adaptor and how reliable they are?

    If one PSU fails will the second kick in and start working?
     
  10. Davo1111

    Davo1111 Member

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    I don't think that exists does it? Most people use a UPS

    The two PSU's are generally used together. One acts as a slave and powers extra devices, rather than it being used as a backup.
     
  11. Rory K

    Rory K Member

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    It exists in server applications, but I think the PSU's themselves need to support it, not the case.
     
  12. RyoSaeba

    RyoSaeba Member

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    Dual PSU bay for desktop machines usually serve 2 purposes. Primarily it's for versatility. Not everyone wants their PSU at the bottom of the case and not everyone wants it at the top. So in this design, the user can choose to put the PSU at the top or the bottom.

    Typically you won't need a 2nd PSU in a desktop system. Only in extremely rare cases would you require 2nd PSU. Usually you can get away with 1 PSU just fine. Unlike a server chassis, it's not design for redundancy. If one of them fail, the 2nd PSU can't take over.
     
  13. Neoshroomish

    Neoshroomish Member

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    I use 2 PSUs to power additional GPUs used for expanding the number of monitor outputs I have. My case is pretty small so I just have it hanging outside.

    Nothing you'd really want outside of very specialised usage.
     
  14. terrastrife

    terrastrife Member

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    2 psu bays is teh same reason why there's spots for so many rads, versatility. it's better to have it than not having it in this... case (unintentional pun) :p

    You can get redundant atx psus, but better yet just mod the two psus bays to take something beefier if you want redundant. that's the whole reason for this case, modding.

    as for likes of 5.25" bays, heck you can fit another psu in two of them if you wanted to :p
     
  15. OP
    OP
    Original Daniel

    Original Daniel Member

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    Thanks for all the replies very informative :)
     

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