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Thread: Voltage fluctuation on PSU while gaming (SSR-650TD)

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    Default Voltage fluctuation on PSU while gaming (SSR-650TD)

    Hey,
    recently i did some oc on my cpu and started monitoring my hardware with HWiNFO64. After a couple of hours of testing (~2 hours prime large fft´s, idle run and 3 hours of playing overwatch) i did notice that the mobo sensors did pick up voltage fluctuations on the 12V rail. The lowest voltage recorded was 12,144V and the highest 12,355V. Usually it´s pinned at 12,302V without any deviation.

    These variations do only seem to happen while the gpu has to work hard. When i do prime stress testing its perfectly stable.

    I do wonder is there something wrong with my psu, or is this behavior normal? Seasonic did advertise it with 20mv ripple and i got 211mv.

    My hardware:
    CPU: i7 3770k
    Mobo: Asrock z77 WS
    GPU: Palit GTX 1080Ti SJS
    Ram: 16Gb Panram Light Swords DDR-3 2400
    SSD/HDD: 2 Samsung SSD´s and 2 WD HDD´s
    PSU: Seasonic 650 Prime Titanium (5 Months old)

    https://picload.org/view/dalrdciw/im...84336.jpg.html
    Last edited by Serinox; 03-11-2018 at 03:54 PM. Reason: Picture link

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    You can't measure anything about the PSU with software like HWiNFO. Software like that is always way off. And what you see is voltage regulation, well at least the software is trying to give you with those numbers, but failing. It has nothing to do with ripple measurements. It you want to measure ripple, you need a static load and a oscilloscope.

    The picture doesn't work by the way.

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    Quote Originally Posted by Serinox View Post
    I do wonder is there something wrong with my psu, or is this behavior normal?
    You're measuring voltage fluctuations AT THE MOTHERBOARD, so how would this indicate ANYTHING about the PSU? You have power going from the ATX connector to the PCIe slot through motherboard traces. Somewhere in between, the motherboard is reading the voltage and reporting it to the BIOS and other software. As loads increase, the resistance increases as well and voltages drop. But this is not necessarily a drop of voltage at the PSU.

    Quote Originally Posted by Serinox View Post
    Seasonic did advertise it with 20mv ripple and i got 211mv.
    SERIOUSLY?!?! How did you measure that ripple?

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    Quote Originally Posted by -The_Mask- View Post
    The picture doesn't work by the way.
    Works for me. But it's just a screenshot from HWInfo. Nothing actually useful like a DMM or an oscilloscope.

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    Quote Originally Posted by jonnyGURU View Post
    Works for me. But it's just a screenshot from HWInfo. Nothing actually useful like a DMM or an oscilloscope.
    That's because he fixed the link.

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    Quote Originally Posted by jonnyGURU View Post
    SERIOUSLY?!?! How did you measure that ripple?
    Vmax-Vmin, but you already know that
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    Quote Originally Posted by strumf666 View Post
    Vmax-Vmin, but you already know that
    Oooooooooooooooooooooooooooooooooooooohhhh...

    So he's measuring "regulation" based on software and calling it ripple?

    Yeah... no.

    OP: That's not ripple. You need an oscilloscope to measure ripple. Software isn't going to give you that information.

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    Red face

    Quote Originally Posted by jonnyGURU View Post
    You're measuring voltage fluctuations AT THE MOTHERBOARD, so how would this indicate ANYTHING about the PSU? You have power going from the ATX connector to the PCIe slot through motherboard traces. Somewhere in between, the motherboard is reading the voltage and reporting it to the BIOS and other software. As loads increase, the resistance increases as well and voltages drop. But this is not necessarily a drop of voltage at the PSU.
    Thanks, that information is really helpful! So basically as long as my system is running fine i shouldn't worry about this mobo readings? And as long i don't use a oscilloscope, there is no way to determine whether the psu is fine or not?

    Btw i don't want to piss you guys off by asking stupid questions. I really just don't know much about this stuff and that's why i am asking.

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    Nobody's pissed off.

    You just made a lot of assumptions in your OP and we tend to tease a bit.

    I will put it this way: Even if those software readings were accurate, you're way within spec. Intel spec is +/- 5%. But if you want real readings, you really need a DMM plugged directly into the PSU.

    The oscilloscope is for measuring ripple. You're confusing regulation with ripple. You can't measure ripple with household electronics tools (unless electronics is your hobby and you have a lot of expensive tools).

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