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PSU for new build

I need some recommendations on a solid power supply for a build I've decided on. I don't plan on overclocking as soon as I build, but may later. Here's the specs

RAM: G.Skill Ripjaws Series 8GB (2 x 4GB) DDR3-1600 Memory
MOBO: ASRock Z77 Extreme4 ATX LGA1155 Motherboard
SSD: 120GB A-Data S510
HDD: Western Digital Caviar Black 1TB 3.5" 7200RPM Internal Hard Drive
CPU: Intel Core i5-3570K 3.4GHz Quad-Core Processor
GPU: Asus Radeon HD 7850 2GB Video Card
CASE: Antec Three Hundred Two ATX Mid Tower Case (comes with 2 fans 1x120mm 1x140mm)
ODD: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer

I used the following link to estimate how much wattage I'd need and came up with around a recommended 317W.
http://extreme.outervision.com/psucalculatorlite.jsp

I read the page on Tom's Hardware about choosing the right PSU, but I'm still a little lost. I know the amps per 12V rail is important, but I can't find much information about how the power consumption for the Asus HD 7850. Can anyone give some suggestions or help me figure it out?
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  1. For a system using a single reference clocked Radeon HD 7850 graphics card AMD specifies a minimum of a 500 Watt or greater power supply. The power supply should also have a combined +12 Volt continuous current rating of 27 Amps or greater and have at least one 6-pin PCI Express supplementary power connector.

    For a system using two reference clocked Radeon HD 7850 graphics cards in 2-way CrossFireX mode AMD specifies a minimum of an 600 Watt or greater power supply. The power supply should also have a combined +12 Volt continuous current rating of 39 Amps or greater and have at least two 6-pin PCI Express supplementary power connectors.

    If your planning on overclocking the graphics cards add another 3 Amps per graphics card.

    The +12V Amperage values I've given will enable the system to run Furmark or OCCT GPU stability testing without the power supply shutting down due to triggering of the OCP.

    What is your power supply budget?
  2. ghoti_ said:
    I need some recommendations on a solid power supply for a build I've decided on. I don't plan on overclocking as soon as I build, but may later. Here's the specs

    RAM: G.Skill Ripjaws Series 8GB (2 x 4GB) DDR3-1600 Memory
    MOBO: ASRock Z77 Extreme4 ATX LGA1155 Motherboard
    SSD: 120GB A-Data S510
    HDD: Western Digital Caviar Black 1TB 3.5" 7200RPM Internal Hard Drive
    CPU: Intel Core i5-3570K 3.4GHz Quad-Core Processor
    GPU: Asus Radeon HD 7850 2GB Video Card
    CASE: Antec Three Hundred Two ATX Mid Tower Case (comes with 2 fans 1x120mm 1x140mm)
    ODD: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer

    I used the following link to estimate how much wattage I'd need and came up with around a recommended 317W.
    http://extreme.outervision.com/psucalculatorlite.jsp

    I read the page on Tom's Hardware about choosing the right PSU, but I'm still a little lost. I know the amps per 12V rail is important, but I can't find much information about how the power consumption for the Asus HD 7850. Can anyone give some suggestions or help me figure it out?

    i like this psu for that build,but a good 600watt should do fine,seasoni,enermax are also good quality,i use a 650watt antec true power psu,that is also good,i recomend you buy quality so it lasts


    http://www.pccasegear.com/index.php?main_page=product_info&cPath=15_354&products_id=18539
  3. thanks for the suggestion, but that one is out of my price range. I'm trying to keep it below $80. Any suggestions for that price range?

    Also, I read
    http://www.tomshardware.com/forum/314712-28-please-read-determine-power-required
    and looked at the actual power consumption on
    http://forums.atomicmpc.com.au/index.php?showtopic=264

    using the highest power consumption from the second site (122) to calculate the amps using the equation on the first link, i came up with ~32.2 amps. Does my PSU need to be at least 500w to fit with the HD 7850 minimum requirement, or do I not need the wattage to be that high?
  4. Best answer
    You could just do the math. The 7850 has only one PCIe plug. Counting the power it can get from the slot, and it can draw a max of 150W. (its rated for around 130 if I remember right.) Toss in your 77W CPU and you are around 225W. Lets add another 50W or so for the rest of the system and any PSU that can output ~275W on its 12V rail(s) will do fine. You'll want one that can do a bit more then that so that its not running at 100%, and you'll need more if you will be doing any overclocking. But that's a good place to start.
  5. PC Power and Cooling Silencer MK III 500W Modular 80PLUS Bronze Power Supply for $79.99 ($59.99 after mail-in rebate card)
    +12V @ 38 Amps
    two (6+2)-pin PCI-E Connectors
    http://www.newegg.com/Product/Product.aspx?Item=N82E16817703035

    Rosewill CAPSTONE Series CAPSTONE-550 550W for $79.99
    +12V @ 45.5 Amps
    two (6+2)-pin PCI-E Connectors
    http://www.newegg.com/Product/Product.aspx?Item=N82E16817182068
  6. ghoti_ said:
    thanks for the suggestion, but that one is out of my price range. I'm trying to keep it below $80. Any suggestions for that price range?

    Also, I read
    http://www.tomshardware.com/forum/314712-28-please-read-determine-power-required
    and looked at the actual power consumption on
    http://forums.atomicmpc.com.au/index.php?showtopic=264

    using the highest power consumption from the second site (122) to calculate the amps using the equation on the first link, i came up with ~32.2 amps. Does my PSU need to be at least 500w to fit with the HD 7850 minimum requirement, or do I not need the wattage to be that high?

    http://www.newegg.com/Product/Product.aspx?Item=N82E16817139028
  7. Best answer selected by ghoti_.
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