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Need help picking psu

I am kinda a noob at computers yet so i need some help.
I am wonder what kind of psu i will need with a computer with these specs.

optical drive: ASUS DRW-24B1ST/BLK/B/AS Black SATA 24X DVD Burner - Bulk - OEM
case:COOLER MASTER HAF 912
cooling: on this i have 6 COOLER MASTER R4-S2S-124K-GP 120mm Case Fan with a fan control idk which one
cpu:Intel Core i5-2500 3.3GHz
graphics card:SAPPHIRE 100314-3L Radeon HD 6870
MoBo:ASRock Z68 Extreme3 Gen3 ATX LGA1155 Motherboard
ram:Patriot Gamer 2 Series 8GB (2 x 4GB) DDR3-1333 Memory
HHD:Hitachi 500GB 3.5" 7200RPM Internal Hard Drive

i would like it to be under 50$ and i dont think i can afford this but one that is modular
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More about need picking
  1. dont skimp on the psu

    its the most important part of your pc

    go for a good maker--corsair, seasonic etc

    also you listed a z68 motherboard so you should really be looking at a 2500k and not a 2500

    the 2500k can be overclocked to about 4.5ghz with a cheap but decent cooler like the hyper 212+
  2. Best answer
    For a system using a single Radeon HD 6870 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 28 Amps or greater and have at least two 6-pin PCI Express supplementary power connectors.

    Total Power Supply Wattage is NOT a crucial factor in power supply selection!!! Total Continuous Amperage Available on the +12V Rail(s) is the most important.

    The OCZ ModXStream Pro 500W (OCZ500MXSP) for $64.99 ($44.99 after mail-in rebate card), with its combined +12 Volt continuous current rating of 36 Amps and with its one 6-pin and one (6+2)-pin PCI Express supplementary power connectors, is semi modular and is more than sufficient to power your system configuration with a single Radeon HD 6870.

    http://www.newegg.com/Product/Product.aspx?Item=N82E16817341016
  3. +1 for the ModXStream Pro 500W...I'm running a 6950 on one right now.
  4. Best answer selected by HungryFiend.
  5. This topic has been closed by Mousemonkey
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