How Many Watts Do I Need for this Desktop?

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  1. Posts : 19,516
    W11+W11 Developer Insider + Linux
       #11

    They don't teach physics in schools nowadays ?
    Ohm's law:
    W=V*A
    A=W/V
    V=W/A
      My Computers


  2. Posts : 13,898
    Win10 Version 22H2 Pro and Home, Win11 Pro and Home
       #12

    Didn't see it mentioned but when increasing the size of the power supply keep in mind the power available in the wall sockets, usually have 15 Amp breakers but maybe 20 Amp. Add up the need for all the devices on each circuit. I had to run a separate line from the breaker panel and used 20 Amp breaker for it. Part of the need was for 2 to 4 computers, 2 monitors and 2 printers, the laserjet uses quite a bit.
      My Computers


  3. Posts : 19,516
    W11+W11 Developer Insider + Linux
       #13

    Berton said:
    Didn't see it mentioned but when increasing the size of the power supply keep in mind the power available in the wall sockets, usually have 15 Amp breakers but maybe 20 Amp. Add up the need for all the devices on each circuit. I had to run a separate line from the breaker panel and used 20 Amp breaker for it. Part of the need was for 2 to 4 computers, 2 monitors and 2 printers, the laserjet uses quite a bit.
    That depends on voltage. 110v may need 20 amp breaker but on 220v only 10A.
      My Computers


  4. Posts : 13,898
    Win10 Version 22H2 Pro and Home, Win11 Pro and Home
       #14

    CountMike said:
    That depends on voltage. 110v may need 20 amp breaker but on 220v only 10A.
    Good point since there's no information about where the OP is located.
      My Computers


  5. Posts : 445
    Win 10 Pro 64
       #15

    Berton said:
    Good point since there's no information about where the OP is located.
    LOL......yes, I know what assume means, but based on his parts list pickings you almost have to believe he is in the US.......
      My Computers


  6. Posts : 234
    8.1 / 10
       #16

    Here ya go....have fun.

    eXtreme Power Supply Calculator

    For that build, I'd go with a minimum of 550. The 750 would be much better, and allow for expansion in the future, if you should so wish it, without having to buy a new PSU along with your new upgrade / addition.
      My Computer


  7. Posts : 3,264
    Windows 11 Pro 64 bit Version 21H2
       #17

    I have similar brand of the GTX 970 is uses 145W needing 500W minimum PSU and 28A on +12V Rail.
    This power supply listed has (4 +12V Rails) = 61A Total http://www.evga.com/Products/Product...120-G1-0750-XR

    True the biggest importance when buying a PSU is making sure it will power the graphics card and yes always buy over the wattage needed.
    EVGA is good i use this one http://www.evga.com/Products/Product...220-G2-0750-XR (1 +12V Rail) = 62A Total

    I am not sure of the difference of having it in 4 +12V Rails
      My Computer


  8. Posts : 86
    10
    Thread Starter
       #18

    Vellinious said:
    Here ya go....have fun.

    eXtreme Power Supply Calculator

    For that build, I'd go with a minimum of 550. The 750 would be much better, and allow for expansion in the future, if you should so wish it, without having to buy a new PSU along with your new upgrade / addition.
    Yes I'm in usa. I'll be buying this PSU for my build which is fully modular and gold certified:

    EVGA SuperNOVA NEX750G GOLD 120-PG-0750-GR 750W ATX12V EPS12V SLI Ready CrossFire Ready 80 PLUS GOLD Certified Full Modular Power Supply - Newegg.com

    Now all I need is to buy a Win 7 key very cheap to install win 7, then upgrade to win 10.
      My Computer


 

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