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need a little psu help

need help with a psu my build is
CPU - Intel Core i5-3570K 3.4GHz Quad-Core $189.99
CPU Cooler - Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing $29.98
Motherboard - Asus P8Z77-V ATX LGA1155 $175.98
Memory - G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-1600 $64.99
Storage - Samsung 840 Pro Series 128GB 2.5" SSD $137.11
Seagate Barracuda 1TB 3.5" 7200RPM $69.98
Video Card - Sapphire Radeon HD 7970 GHz Edition 3GB $425.91
Case - NZXT Phantom 410 (White) ATX Mid Tower $79.98

so my question is what psu should i get? i was thinking about a rosewill 850w but i also have 7 fans goin into my system so i was a little worried i wouldnt have enough cables for everything. i do plan on adding another 7970 in a yr or 2 . I didnt know if i should modular or non-modular for this. my price range is around $150 or less i can adjust if need be. any thoughts would be aprreciated opinions on brands and watts to
5 answers Last reply Best Answer
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  1. quality 850W will be plenty for xfire 7970 of course modular
    http://www.directron.com/lzg850.html?gsear=1
    kingwin lazer and review :
    http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story5&reid=206
  2. 850W is enough for two 7970s and because of your fan situation I would get a modular psu. This is a XFX, a very good psu company, that is semi-modular for a very price... http://www.amazon.com/XFX-Edition-Semi-Modular-Power-Supply/dp/B0050751YS
  3. 7970 Needs ~500W . So XFX 750W Pro Core Producing enough W on 12 V rail to keep up with your CPU and GPU will be the best solution.

    http://www.hardwaresecrets.com/article/XFX-PRO-750-W-Power-Supply-Review/1182/7


    http://us.ncix.com/products/?usaffiliateid=1000031504&sku=59617&vpn=P1750SNLB9&manufacture=XFX&promoid=1371
  4. I was looking at a Rosewill 1000W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply, I know its overkill but its $130 I figured better to have it and not need it then need it and not have it. the other was a nzxt hale 90 850w for $143. So my question is is rosewill a good psu from what I researched it seems to be a pretty good deal. does anyone have opinions?
  5. Best answer
    For a system using two Radeon HD 7970 GHz Edition graphics cards in 2-way CrossFireX mode AMD specifies a minimum of an 850 Watt or greater system power supply. The power supply should also have a maximum combined +12 Volt continuous current rating of 60 Amps or greater and have at least two 6-pin and two 8-pin PCI Express supplementary power connectors.

    Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Sufficient Total Combined Continuous Power/Current Available on the +12V Rail(s) rated at 45°C - 50°C ambient temperature, is the most critical factor.

    Overclocking of the CPU and/or GPU(s) will require an additional increase to the maximum combined +12 Volt continuous current ratings, recommended above, to meet the increase in power required for the overclock. The additional amount required will depend on the magnitude of the overclock being attempted.

    The Rosewill BRONZE Series 1000W Continuous (RBR1000-M) Power Supply, with its maximum combined +12 Volt continuous current rating of 75 Amps and with three 6-pin and three (6+2)-pin PCI Express supplementary power connectors, is more than sufficient to power your system configuration with two Radeon HD 7970 GHz Edition graphics cards in 2-way CrossFireX mode.
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