Dont know what size power supply my build will need please help

hello im a first time builder and im having trouble finding out what the wattage is on all my parts is and am not really sure how much porwe my system is going to need and im worried i might get one eather too big or not Strong enough

ok so here is the system layout i am thinking about using (if there is no problems with compatibility)

motherboard - ASUS Sabertooth 990FX AM3+ AMD 990FX SATA 6Gb/s USB 3.0 ATX AMD Motherboard with UEFI BIOS
http://www.newegg.com/Product/Product.aspx?Item=N82E16813131736

Processer - AMD Phenom II X4 965 Black Edition Deneb 3.4GHz Socket AM3 125W Quad-Core Processor
http://www.newegg.com/Product/Product.aspx?Item=N82E16819103727

Video /card - Radeon HD 6850
http://www.amd.com/us/products/desktop/graphics/amd-radeon-hd-6000/hd-6850/Pages/amd-radeon-hd-6850-overview.aspx#2

or (because im not sure what card to go with yet) any tips on this subject would be very helpful :)

Video Card - AMD Phenom II X4 965 Black Edition Deneb 3.4GHz Socket AM3 125W Quad-Core Processor
http://www.newegg.com/Product/Product.aspx?Item=N82E16819103727

Hard Drive - Western Digital 500GB 7200 RPM 16MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive -Bare Drive
http://www.newegg.com/Product/Product.aspx?Item=N82E16822136769

Memory - Crucial 2GB 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10600) Desktop Memory Model
http://www.newegg.com/Product/Product.aspx?Item=N82E16820148470
4 answers Last reply
More about dont size power supply build help
  1. A 650 W PSU should do. Go with a quality OEM like Corsair, Seasonic, Antec, etc.
  2. here's a handy site for calculating power needs
    http://extreme.outervision.com/psucalculatorlite.jsp

    650W is good as the poster above said. You might consider going even higher to compensate for capacitor aging.
  3. chesteracorgi said:
    A 650 W PSU should do. Go with a quality OEM like Corsair, Seasonic, Antec, etc.

    corsair and antec don't make their own units :kaola:
    no offence just kidding.
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