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850w PSU enough for Crossfire 2gb 5870s eyefinity 6 editions

I currently have a 850w Thermaltake PSU Crossfire certified It has the appropriate connections http://www.newegg.com/Product/Product.aspx?Item=N82E16817153106&cm_re=thermaltake-_-17-153-106-_-Product

Ati is not making much sense to me right now.

Crossfire 5970s ATI recommends 850w psu. 5970s used 300+ watts each. According to ATI "650 Watt or greater power supply one 75W 6-pin and one 150W 8-pin PCI Express® power connectors recommended (850 Watt with two 75W 6-pin and two 150W 8-pin connectors for ATI CrossFireX™ technology in dual mode)"
http://www.amd.com/us/products/desktop/graphics/ati-radeon-hd-5000/hd-5970/Pages/ati-radeon-hd-5970-system-requirements.aspx

Crossfire 2gb 5870s ATI recommends 900w psu but they only used 228 watts each."600 Watt or greater power supply is recommended with one 75W 6-pin and one 150W 8-pin PCI Express® power connector required (900 Watt and 2 6-pin and 2 8-pin connectors for ATI CrossFireX™ technology in dual mode)"
http://www.amd.com/us/products/desktop/graphics/ati-radeon-hd-5000/hd-5870-eyefinity-6-edition/Pages/system-requirements.aspx


If my psu will run 2 5970s won't it run two 2gb 5870s? Just trying to avoid forking over for a new 1000w psu.
2 answers Last reply Best Answer
More about 850w crossfire 5870s eyefinity editions
  1. Best answer
    2 5970s will consume 600w
    2 5870s will consume 376w
    2 5870 2GBs will consume ~440w

    Yes, you will be perfectly fine with that.
    I run 2x OC'd 5870s on a 750W Corsair + OC'd PII 965. No problems.
  2. Best answer selected by brennon7.
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