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Thread: 3080 best min PSU recommendation = 750 watts

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    Default 3080 best min PSU recommendation = 750 watts

    https://www.fcpowerup.com/nvidia-308...compatibility/

    I find this testing compelling.

    If it is faulty, please explain how and where?

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    According to google translate 650W units passed it too:

    Seasonic FOCUS SGX-650 ✓ Pass the test
    SuperFlower Zhenhua Leadex III Gold ARGB 650W ✓ Pass the test
    So min known recommendation would be 650W, 750W seems more like author's opinion to be on a safe side I think.

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    That spikes are not new.
    https://www.tomshardware.com/reviews...ance,3979.html
    the key point is 'avarge' load, or socket load multiply efficiency vs spike load.
    from fcp article he mentioned that from the wall he measured 500-600W, DC power 450W-550W.
    spikes 660-1050W, spikes are about twice!!
    in general you don't buy PSU from spike load.
    You can check the protection IC manual and look the intervals they working.
    The consultation from igo'rs 2014 article.
    "The average power draw under load over a certain period of time, as well as the power consumption of the rest of the system, are the only measurements that are really important in PSU selection, not the brief spikes. You've hit the ideal power range if the sum of all components amounts to approximately 75 percent of the maximum capacity during a stress test."
    But if those spikes are 'meaner' that can change.
    Last edited by none77; 09-20-2020 at 06:04 AM.

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    Quote Originally Posted by none77 View Post
    That spikes are not new.
    https://www.tomshardware.com/reviews...ance,3979.html
    the key point is 'avarge' load, or socket load multiply efficiency vs spike load.
    "The average power draw under load over a certain period of time, as well as the power consumption of the rest of the system, are the only measurements that are really important in PSU selection, not the brief spikes. You've hit the ideal power range if the sum of all components amounts to approximately 75 percent of the maximum capacity during a stress test."
    But if those spikes are 'meaner' that can change.
    Sure... but he(FCP) is claiming high spikes can trigger OCP/OPP, that can cause problem.

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    Quote Originally Posted by Polaris20 View Post
    Sure... but he(FCP) is claiming high spikes can trigger OCP/OPP, that can cause problem.
    That is my point. Yes a 660 watt with a very high OCP/OPP set point will pass.

    The point is why would you want to run your PSU at the very edge of capacity? Yes, they are indeed designed to handle higher transit loads. They are not designed to run at the very limit of that OCP/OPP nearly continuously.

    Hence, hitting 1000 watts on a 660 watt PSU consistently (even if only at peak transit load) does not sound like a wise CHOICE.

    When people ASK for the best recommendation, I think it is not only inaccurate, but irresponsible to say : "yeah the OEM says that 750 watts is the best choice, but you are only going to be using something like 300 watts gaming....your CPU uses so much less wattage now than in the past...the 750 watt is extreme overkill,...... you are good with a really high end 550 or 650 watt PSU"

    NVIDIA does indeed know what the high transit load requirement is. Hence, they make the recommendation.

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    He's right and he's wrong.

    You don't have to have the OCP or OPP set high. These spikes are so fast, OCP or OPP isn't going to catch them in an analog PSU. In fact, in most cases I bet the secondary caps alone have enough power to sustain a portion of and "soften" the spike. I think it's a non-issue for any "quality" PSU.

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    Good 600W seems to work ok: https://youtu.be/Bdohv96uGLw

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    Quote Originally Posted by Jon Gerow View Post
    Good 600W seems to work ok: https://youtu.be/Bdohv96uGLw
    Just watched this video, yeah, surprisingly Focus SGX 650W worked too, despite there are some reports that regular 650W Focus trips ...

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    why risk it. go with a 750...
    8600K NH-D15 . 512GB 850pro . F4-3200C14D-32GVK . ASUS PRIME Z370-A . CORSAIR RM550x . BenQ G2420HD . GALAX GTX 1660S 6GB

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    FYI, A number of popular 650W 80+Gold PSUs didn't pass his TEST. Currently there are two (or maybe three) 750W 80+ Gold PSU models, one from a well-known brand and a renowned OEM, which are Unable to pass his test.
    You need a bit of luck to pick the right 650W model.
    Last edited by Travis; 09-22-2020 at 12:30 PM. Reason: typo

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