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How much Wattage does my PC need?

Hello, I'm kind of new to building PC's and I would like to know how much wattage I should get. Also, if the parts are compatible with each other. (I already checked though.) And sorry if I'm posting in the wrong forums :-D
This PC will be mainly used for gaming and web browsing.

CPU: A Phenom ii x4 955 Black Edition Overclocked http://www.newegg.com/Product/Product.aspx?Item=N82E16819103808
CPU aftermarket cooler: COOLER MASTER Hyper 212 http://www.newegg.com/Product/Product.aspx?Item=N82E16835103065

RAM: G.SKILL Sniper 8GB 12800CL9D-8GBSR http://www.newegg.com/Product/Product.aspx?Item=N82E16820231416

GPU: XFX Radeon HD 6870 HD-687A-ZHFC Overclocked http://www.newegg.com/Product/Product.aspx?Item=N82E16814150561
GPU aftermarket cooler: ARCTIC COOLING Accelero TWIN TURBO Pro http://www.newegg.com/Product/Product.aspx?Item=N82E16835186046&Tpk=Arctic%20Cooling%20twin%20turbo

Motherboard: ASUS M5A97 EVO http://www.newegg.com/Product/Product.aspx?Item=N82E16813131757

Hard Drive: Western Digital Caviar Black WD7502AAEX 750GB http://www.newegg.com/Product/Product.aspx?Item=N82E16822136794

Case: Antec Nine Hundred http://www.newegg.com/Product/Product.aspx?Item=N82E16811129021


Remind me if I'm missing anything. Anyway, in the future (not now) I might run Crossfire. How much wattage will that take as well?

Thanks!
9 answers Last reply Best Answer
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  1. I almost forgot!

    Optical Drive: ASUS 24X DVD Burner http://www.newegg.com/Product/Product.aspx?Item=N82E16827135204
  2. I'm not convinced the aftermarket GPU cooler offers anything of value, have you searched for reviews?

    You don't need a dedicated sound card unless you're running a studio. Onboard sound is great.

    That system will make due with a quality 400W PSU. For XFire get 500-600W.
  3. FinneousPJ said:
    I'm not convinced the aftermarket GPU cooler offers anything of value, have you searched for reviews?

    You don't need a dedicated sound card unless you're running a studio. Onboard sound is great.

    That system will make due with a quality 400W PSU. For XFire get 500-600W.



    From what I've read, it seems to be a pretty good cooler. And, I'll take out the Dedicated sound card.
  4. BUMP
  5. to calculate your PSU requirements see here.

    http://extreme.outervision.com/psucalculatorlite.jsp
  6. Thanks for all the replies!

    I'll probably be keeping this PC for more than a year, so should I get a 550w PSU or stick with a 500w PSU?

    Thanks!
  7. Best answer
    Get a 650W PSU such as XFX Core 650W. It will run crossfire as well.

    Otherwise a 500W will do fine.
  8. You know, that's a good idea. I'll probably upgrade in the future to Crossfire in probably a year, so a 500w will be sufficient for now.

    Thanks for all the replies! I'm pretty satisfied and confident.
  9. Best answer selected by danio64.
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