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Power Supply Requirements

Hi Everyone,

Recently one of my ATI Radeon 5870s has been having problems. XFX is sending me 2 6950s and had some questions about my power supply. Currently I am running-

-AMD Phenom 1090T (stock settings)
-16GB GSKills 1333 MHz RAM
-2x Radeon 5870s
-3 hard drives (Vertex 3, WD Caviar Black 1.5TB, 1TB Seagate Barracuda)
-X-Fi Titanium Sound Card
-5 Case fans
-Ram Cooler
-CD Drive

Currently my PSU is a OCZ Fatality 750W PSU ( http://www.newegg.com/Product/Product.aspx?Item=N82E16817341041 ). I don't have any knowledge on PSUs and was always worried that my current PSU was too small or right on the edge of my requirements. I have a friend ready to buy my OCZ PSU so I won't lose much money but don't want to spend the money for a new one if I don't need to. Also if I should get a new one, here are three I was looking at-

http://www.newegg.com/Product/Product.aspx?Item=N82E16817171049

http://www.newegg.com/Product/Product.aspx?Item=N82E16817139013

http://www.newegg.com/Product/Product.aspx?Item=N82E16817371050

Like I said, I know nothing about PSUs or anything like 12V Rails or anything specific. Any recommendations on PSUs or what to do would be great! I would like to not spend the money if don't need to. Also one last question, when i get the 6950s, can running a PSU too small do any damage to any components. Thank you so much and sorry for such a long question.
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  1. Best answer
    6950s aren't that much (if at all) more power hungry than 5870s. So if you haven't been having problems with your current PSU, then you shouldn't have problems after upgrading your GPUs.

    The OCZ Fatal1ty 750W isn't the best quality unit and only has 650W combined on its 12V rails. 650W is certainly capable of powering a build with two 5870s/6950s, but most people would prefer to get a high quality 750W unit, so I could understand why you would want to upgrade. However you don't need to go up as much as 900W+, unless you are wanting to keep as many upgrade options open as possible.

    Two 'budget' options:
    XFX Pro 850W Core Edition 80Plus Bronze $120 ($30 rebate, $6 shipping)
    http://www.newegg.com/Product/Product.aspx?Item=N82E16817207015

    Rosewill Capstone 750W 80Plus Gold $120
    http://www.newegg.com/Product/Product.aspx?Item=N82E16817182073

    Some top quality options:
    Seasonic X-750 80Plus Gold Modular $160
    http://www.newegg.com/Product/Product.aspx?Item=N82E16817151087

    NZXT Hale90 750W 80Plus Gold Modular $160 ($6 shipping)
    http://www.newegg.com/Product/Product.aspx?Item=N82E16817116011

    Antec HCP-750 80Plus Gold Modular $160 ($10 rebate)
    http://www.newegg.com/Product/Product.aspx?Item=N82E16817371052

    Out of the three you linked I think the Corsair 950TX is a better choice than the Cooler Master. You would go with the Antec HCG-900 if you wanted to save money more than anything.
  2. Of the two "budget " choices, the Rosewill is not bad:
    http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story&reid=266
    Looks like Rosewill is finally learning to market good power supplies. But the XFX is built by Seasonic.

    A pair of 5870's needs about 25 - 30 amps. Figure another 10 amps for an overclocked CPU. That is about 480 watts peak. Figute another 120 watts for the rest of the system and a 750 watt PSU will be operating at about 80% of rated capacity.

    A 750 watt PSU will do, but I would put an 850 - 900 watt PSU into a build like yours.

    With two video cards, I would not bother with a modular or semi-modular design. You will not have many cables left over.
  3. With the possibility of future card upgrades to say 7970s or 580gtxs, I was also looking at this one:

    http://www.newegg.com/Product/Product.aspx?Item=N82E16817139013

    Would this be a good call because with the 15% off it comes down to around 120 dollars after the rebate. Or should i go with one of your recommendations?

    Thanks
  4. nickeagles416 said:
    With the possibility of future card upgrades to say 7970s or 580gtxs, I was also looking at this one:

    http://www.newegg.com/Product/Product.aspx?Item=N82E16817139013

    Would this be a good call because with the 15% off it comes down to around 120 dollars after the rebate. Or should i go with one of your recommendations?

    Thanks

    Yes it will handle a pair of Radeon HD 7970 or a pair of GeForce GTX 580 graphics cards.
  5. nickeagles416 said:
    With the possibility of future card upgrades to say 7970s or 580gtxs, I was also looking at this one:

    http://www.newegg.com/Product/Product.aspx?Item=N82E16817139013

    Would this be a good call because with the 15% off it comes down to around 120 dollars after the rebate. Or should i go with one of your recommendations?

    Thanks

    http://www.newegg.com/Product/Product.aspx?Item=N82E16817182239

    actually much better if you look past the flash
  6. Thanks for the advice everyone but I actually end up buying an 850W PSU from another friend for only 75 bucks.

    http://www.newegg.com/Product/Product.aspx?Item=N82E16817182072&Tpk=rosewill%20850w

    Was this a good choice for the money and will it work with my 5870s/6950s?
  7. Best answer selected by nickeagles416.
  8. nickeagles416 said:
    Thanks for the advice everyone but I actually end up buying an 850W PSU from another friend for only 75 bucks.

    http://www.newegg.com/Product/Product.aspx?Item=N82E16817182072&Tpk=rosewill%20850w

    Was this a good choice for the money and will it work with my 5870s/6950s?

    It earned a jonnyGURU Recommended seal.

    http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story4&reid=60

    Yes it'll work with a pair of Radeon HD 5870 or Radeon HD 6950.
  9. This topic has been closed by Mousemonkey
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