Windows 10: Is this the Right Wattage for a PSU for Gaming?

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  1.    19 Jul 2016 #1

    Is this the Right Wattage for a PSU for Gaming?


    I think I made a mistake in buying a PSU with 750 watts for my gaming PC with Nvidia 1080. I think I should've bought one with 850 or 1000 watts. The reason being is that I calculated the necessary power according to my parts through newegg's power calculator. It spit out an output of 789 watts. Since I got a PSU of 750 watts, I don't think this will cut it.

    What do you think? Should I return this PSU in exchange for a 850 or 1000 watt PSU?

    Here's my PC parts list:
    http://pcpartpicker.com/user/xlook/saved/QsYV3C

    Here's my PSU:
    http://m.newegg.com/Product/index?it...9SIA1N83U90934
      My ComputerSystem Spec


  2. Posts : 8,176
    Windows 10 Enterprise and Pro/Windows 7 Enterprise/Linux Mint
       20 Jul 2016 #2

    The biggest power draw in your computer is the 1080 which max power is usually about 200-220 W. That leaves you 500+ watts to run the rest of the computer. I think you will be fine. EVGA is recommending a minimum of a 500W power supply for the 1080. You have well over that.
      My ComputersSystem Spec

  3.    20 Jul 2016 #3

    essenbe said: View Post
    The biggest power draw in your computer is the 1080 which max power is usually about 200-220 W. That leaves you 500+ watts to run the rest of the computer. I think you will be fine. EVGA is recommending a minimum of a 500W power supply for the 1080. You have well over that.
    Then why do some sites recommend a PSU of 500 watts while other sites recommend one with 850 watts for the 1080?
      My ComputerSystem Spec

  4.    20 Jul 2016 #4

    That's because all PSUs are not created equal. Some (lesser) makes don't produce same power they are rating them for. With no name or basic ones you can expect to be able to use barely 50% of their official rating power on continual basis.
    It's a good practice to use PSU with 25% higher power rating than calculated power required for the system. If you suspect it's not enough, follow the PSU temperature during prolonged loads. If temperature on it's exhaust raises substantially, it's sign that it can't keep up safely and should be replaced by stronger (or better) one.
      My ComputerSystem Spec

  5.    20 Jul 2016 #5

    650 watts PSU is sufficient enough to run a single graphics card setup . Anything over that is consider SLI/CrossFire setup, and some sites recommend you 850 watts or 1000 watts power supply because in the future if you want SLI or CrossFire, you don't have to upgrade your power supply which is pain the butt to do it, but rather just swap in the second card and there ya go.
      My ComputerSystem Spec

  6.    20 Jul 2016 #6

    The calculators also take into account average daily peak usage. The higher the number of hours it's used at peak usage, the more wear on the PSU. I generally choose a PSU that will allow it to run between 80 and 85% usage, when my system is at peak power draw. So, if I calculate my system will draw 800 watts at it's PEAK, then I get a 1000 watt PSU, and then make sure the various rails have enough amperage to deliver steady power....which is vital.
      My ComputerSystem Spec

  7.    21 Jul 2016 #7

    Vellinious said: View Post
    The calculators also take into account average daily peak usage. The higher the number of hours it's used at peak usage, the more wear on the PSU. I generally choose a PSU that will allow it to run between 80 and 85% usage, when my system is at peak power draw. So, if I calculate my system will draw 800 watts at it's PEAK, then I get a 1000 watt PSU, and then make sure the various rails have enough amperage to deliver steady power....which is vital.
    There is no way your rig will draw 800 watts based on your setup configuration. Your rig probably draw 400 watts to 455 watts at the most, so get a 1000 watt PSU just going to waste money for a single card setup.
      My ComputerSystem Spec

  8.    21 Jul 2016 #8

    SexyColdNoodle said: View Post
    There is no way your rig will draw 800 watts based on your setup configuration. Your rig probably draw 400 watts to 455 watts at the most, so get a 1000 watt PSU just going to waste money for a single card setup.
    With 2 x 980ti and a 5820k all overclocked as high as I push them for benchmarking, I'm actually going over the 800 watt mark. By a ways.... Even with just the 290X on benchmarking runs I was pulling well over 600 watts.

    lol
      My ComputerSystem Spec


  9. Posts : 8,176
    Windows 10 Enterprise and Pro/Windows 7 Enterprise/Linux Mint
       21 Jul 2016 #9

    Vellinious said: View Post
    With 2 x 980ti and a 5820k all overclocked as high as I push them for benchmarking, I'm actually going over the 800 watt mark. By a ways.... Even with just the 290X on benchmarking runs I was pulling well over 600 watts.

    lol
    I only have 1 980 Classified, but I'm in a similar situation. But we have overclocked 140W CPUs and he has a 65W, non overclockable CPU. He will probably never see 400W. All of the GPU manufacturers and most of the PSU calculators way overshoot what you need. Probably because they have no idea what quality PSU you will buy and what else you have in your computer.
      My ComputersSystem Spec

  10.    21 Jul 2016 #10

    essenbe said: View Post
    I only have 1 980 Classified, but I'm in a similar situation. But we have overclocked 140W CPUs and he has a 65W, non overclockable CPU. He will probably never see 400W. All of the GPU manufacturers and most of the PSU calculators way overshoot what you need. Probably because they have no idea what quality PSU you will buy and what else you have in your computer.
    I agree. I was just giving an example.

    "So, if I calculate my system will draw 800 watts at it's PEAK, then I get a 1000 watt PSU, and then make sure the various rails have enough amperage to deliver steady power....which is vital."

    I'm actually pulling enough with the 980ti Classys that I decided to get another PSU just for them. Won't need it when the 1080s come in, but....eh, I'll have a spare for the test bench.
      My ComputerSystem Spec


 
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