Seasonic Snow Silent 750W Power Supply Review

Recently, Seasonic introduced a new 750W Snow Silent unit, featuring Platinum-rated efficiency, fully modular cabling and semi-passive operation.

By Aris Mpitziopoulos
published

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Ripple Measurements

To learn how we measure ripple, please click here.

The following table includes the ripple levels we measured on the rails of the Snow Silent 750. The company says the limits of the unit are 120mV (+12V) and 50mV (5V, 3.3V and 5VSB).

Swipe to scroll horizontally
Test12 V5 V3.3 V5VSBPass/Fail
10% Load10.5mV11.1mV11.6mV5.8mVPass
20% Load14.2mV10.2mV12.6mV6.3mVPass
30% Load18.3mV10.8mV13.3mV7.0mVPass
40% Load18.4mV11.6mV14.2mV8.0mVPass
50% Load19.9mV11.9mV16.0mV8.6mVPass
60% Load20.9mV12.9mV15.3mV9.4mVPass
70% Load23.0mV13.9mV15.6mV11.5mVPass
80% Load23.1mV13.8mV16.2mV11.9mVPass
90% Load23.6mV14.5mV16.8mV13.3mVPass
100% Load25.5mV15.1mV17.2mV14.5mVPass
110% Load27.3mV15.2mV18.5mV16.0mVPass
Cross-Load 115.3mV14.6mV16.1mV28.0mVPass
Cross-Load 225.9mV13.0mV15.3mV14.7mVPass
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Ripple suppression was good on all rails; that's normally the case in Seasonic PSUs. This clearly shows that the company used the proper filtering capacitors without making any sacrifices in load regulation and efficiency.

Ripple Oscilloscope Screenshots

The following oscilloscope screenshots illustrate the AC ripple and noise registered on the main rails (+12V, 5V, 3.3V and 5VSB). The bigger the fluctuations on the screen, the bigger the ripple/noise. We set 0.01V/Div (each vertical division/box equals 0.01V) as the standard for all measurements.

Ripple At Full Load

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Ripple At 110-Percent Load

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Ripple At Cross-Load 1

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Ripple At Cross-Load 2

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Aris Mpitziopoulos
Aris Mpitziopoulos
Contributing Editor

Aris Mpitziopoulos is a Contributing Editor at Tom's Hardware US, covering PSUs.

20 Comments Comment from the forums
  • dragget
    "Unfortunately, the on/off switch for toggling hybrid mode is located on the back side of the PSU, so accessing your system's internals becomes necessary if you want to change fan modes."
    Most likely they did it this way to avoid having two switches on the outside face of the PSU. If they had placed both switches there I can see people reaching around the back of their case to change fan modes and accidentally turning off their PC because they flipped the wrong switch.
    Reply
  • g-unit1111
    This would look awesome in my H440!
    Reply
  • Adroid
    Yea to be honest I prefer the fan/hybrid toggle on the INSIDE of my case anyway. I put my Seasonic Platinum 650W in hybrid mode a long time ago and forgot about it.

    I don't see any need to flip the switch on and off, in fact I can't think of a single good reason why I would ever want to touch the thing again. So for me, it would be a con to have the switch on the outside of the case.
    Reply
  • Aris_Mp
    this switch is much smaller than the on/off one so it is really hard to mix them up. Also the on/off switch is harder to activate. In any case as a reviewer I see this as a con, not a serious though. Some users out there will share my opinion while others won't.
    Reply
  • dragget
    this switch is much smaller than the on/off one so it is really hard to mix them up.
    If you were looking at the back of the PSU, then yes, but I'm assuming the more common situation where the user is reaching around the back of the case where they can't see. In this scenario, one would have to feel around the back with their hand so it's much easier to get it wrong. I almost never use the switch on the back of my PSU, so every two or three months when I DO use it, I have to fumble around in the back to find the switch. For your average user, having two switches back there would just be asking for trouble.
    Reply
  • MasterDell
    A lot of companies are putting the hybrid switch on the inside of the PSU. Just like the new units EVGA is putting out. It makes no sense to put the switch on the outside due to confusion with the on/off switch
    Reply
  • LookItsRain
    180 dollars for this? No.
    Reply
  • JQB45
    I'd pay $150-$180 USD for this PSU and not just because its pretty.
    Reply
  • dstarr3
    180 dollars for this? No.

    For a rock-solid PSU with a 7-year warranty? This thing would power my next three or four computers. $180 for not having to buy another PSU for a decade is a damn good deal.

    Regarding the fan switch, my PSU has a similar feature, and honestly, I imagine most people would set it at installation and never change it. I sure haven't.
    Reply
  • Aris_Mp
    Indeed a PSU is an investment, something that unfortunately most people cannot see or understand while on the same time they have no problem spending serious money on GPUs and CPUs.

    You can keep a good PSU for many system builds while a not reliable, cheap PSU besides breaking down fast can also destroy many of your system components.
    Reply