How big of a power supply would I need?

This is what i'm using right now

http://www.newegg.com/Product/Product.aspx?Item=N82E16817371011

I just put a 9450 intel quad core in, 2x2gb ocz ram, visiontek 4870, also have 1 dvd-burner, 250gb hd, 74gb raptor in my system.

What would I need to get upto 4x2gb ram, another 4870 xfired?

850watt or higher, I believe 650w is too low for what i want to do eventually.

Since the 4870s seems to max out at 285w by itself under load.

Thanks!
11 answers Last reply
More about power supply need
  1. A good 750w PSU will be plenty, I recommend the PC Power and Cooling 750w, it is the absolute BEST 750w PSU when it comes to stability and quality.
  2. cmichael258 said:


    The_Blood_Raven said:
    A good 750w PSU will be plenty, I recommend the PC Power and Cooling 750w, it is the absolute BEST 750w PSU when it comes to stability and quality.


    Anonymous said:
    http://www.newegg.com/Product/Product.aspx?Item=N82E16817139006 same as the pc power and cooling but cheaper^


    TY! I did not know that psu calc existed. :D
  3. do u plan to upgrade ur system in the future?
  4. invisik said:
    do u plan to upgrade ur system in the future?

    It just depends. If I added another 4870 and 4 more gbs of ram, i'd be maxing out my system. I want this rig to last around 2.5-3 years.

    It depends on what the prices do of those 2 items.
  5. I've got the Zalman 750 (yes a 750 should be plenty)(I just hate the blue LED's), and I'm using a 9850 (high wattage) it runs my system fine. Just get a good quality PSU, and it should last you through a few builds.


    P.S. Modular cabling is a plus
  6. Another, slightly different approach to PSU selection,
    is to look at their graphs of efficiency vs. load.

    Then, pick a point on that graph where efficiency
    is highest: in that way, you'll minimize power
    consumption in the long run.

    Whenever in doubt, a good rule of thumb is
    to utilize 50% of the rated capacity of any given PSU.

    ...

    Interesting... when looking at the Corsair efficiency for a 650 W supply:
    <http://www.corsairmicro.com/_images/charts/tx650w_efficiency.jpg>

    The 230 Vac curve is 2% higher than the 115 Vac... Perhaps I should consider running a 230 Vac line to my server to get the better efficiency! Has anyone else out there considered this?
  7. This calculator is much more up-to-date than newegg's:

    http://extreme.outervision.com/psucalculator.jsp
  8. okay so i would suggest a good 600watt. im running a q6600 oc @ 3.0ghz and 2 gtx 260 in sli oc running on a 500w! just to be safe i would recommend 600w if ur gonna oc alot or if u add any extra hardrive, fans etc..
    anything above 700w is just overkill.
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