How to figure out how many watts is enough for your power supply?

I just ordered parts to put together a good fast system. I ordered a 750w power supply and am wondering if it is enough.

If you want to know exactly what I'll be running off of it, it is listed here: http://www.tomshardware.com/forum/forum2.php?config=tomshardwareus.inc&cat=31&post=267482&page=1&p=1&sondage=0&owntopic=1&trash=&trash_post=&print=0&numreponse=0&quote_only=0&new=0&nojs=0#t1955537

But I'd like to know the forumla for figuring it out for other systems I build too.

thansk!!
7 answers Last reply
More about figure watts power supply
  1. Drop the Rosewill PSU, from the look of things a good quality 650W will be more than enough. Look for: Antec, BFG, Corsair, PC P&C, OCZ, or Silverstone (unless in a 220v area).
  2. Why do people ask after they've already ordered? I don't understand that logic.
  3. That particular Rosewill is a new one; 80+ bronze certified, with Active PFC. While the older Rosewills were lessons in overrated suckage, that new model should be decent. At the very least, it was run at 100% during the certification process, and didn't croak.
  4. I was considering going with this one: http://www.newegg.com/Product/Product.aspx?Item=N82E16817182188

    The reason I'm 2nd guessing my purchase in the first place is a guy who works with me says if I add a 2nd graphics card, the power supply probably will not cut it.
  5. Thanks for your input guys!

    I found this article and shed some light on the topic for me: http://www.anandtech.com/casecoolingpsus/showdoc.aspx?i=3413&p=1
  6. developermct said:
    I was considering going with this one: http://www.newegg.com/Product/Product.aspx?Item=N82E16817182188

    The reason I'm 2nd guessing my purchase in the first place is a guy who works with me says if I add a 2nd graphics card, the power supply probably will not cut it.


    This PSU is better quality and plenty of power for 2 4870s.
    http://www.newegg.com/Product/Product.aspx?Item=N82E16817139010
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