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What is a good site or tool for calculating power supply needed?

I have been trying to find a way for calculating my power supply needed for my computer that I am building, but I cannot find one.

I tried this site, but it is down, for me at least, and has bad reviews:http://extreme.outervision.com/psucalculatorlite.jsp

Any help is greatly appreciated and thank you.
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  1. Best answer
    The psu required is almost entirely determined by the graphics configuration.
    That is assuming a normal complement of peripherals.
    Here is a chart that will solve your problem:
    http://www.realhardtechx.com/index_archivos/Page362.htm
    It is not wrong to overprovision a bit, say 20% a psu will run quieter and more efficiently in the middle third of it's range.
    It will consume only the wattage demanded of it.

    Perhaps a more important question is how to pick a quality psu.
    Here is one list for that:
    http://www.eggxpert.com/forums/thread/323050.aspx
  2. That chart doesn't give the +12V requirements. I prefer to go by this list (at least for single-card configs, +12V requirements for SLI/CF are harder to find):
    http://forum-en.msi.com/faq/article/power-requirements-for-graphics-cards
  3. geofelt said:
    The psu required is almost entirely determined by the graphics configuration.
    That is assuming a normal complement of peripherals.
    Here is a chart that will solve your problem:
    http://www.realhardtechx.com/index_archivos/Page362.htm
    It is not wrong to overprovision a bit, say 20% a psu will run quieter and more efficiently in the middle third of it's range.
    It will consume only the wattage demanded of it.

    Perhaps a more important question is how to pick a quality psu.
    Here is one list for that:
    http://www.eggxpert.com/forums/thread/323050.aspx


    Thank you! and how much should I go above the projected wattage? I have the GeForce GTX 760. Also, what is the difference with the PCIe connectors (6 pin and 8 pin).
  4. MauveCloud said:
    That chart doesn't give the +12V requirements. I prefer to go by this list (at least for single-card configs, +12V requirements for SLI/CF are harder to find):
    http://forum-en.msi.com/faq/article/power-requirements-for-graphics-cards


    That is also good. Thanks!
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