Enermax Revolution SFX 650W PSU Review

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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 ERV650SWT's rails. The limits, according to the ATX specification, are 120mV (+12V) and 50mV (5V, 3.3V and 5VSB).

Swipe to scroll horizontally
Test12V5V3.3V5VSBPass/Fail
10% Load18.1mV12.2mV10.1mV7.4mVPass
20% Load21.7mV13.0mV12.4mV7.6mVPass
30% Load23.8mV14.4mV14.3mV8.8mVPass
40% Load26.5mV16.2mV17.0mV9.7mVPass
50% Load31.4mV17.9mV22.5mV10.6mVPass
60% Load25.0mV20.2mV27.1mV12.0mVPass
70% Load27.2mV19.9mV27.0mV11.4mVPass
80% Load27.9mV21.9mV28.8mV11.8mVPass
90% Load28.6mV23.2mV32.4mV12.6mVPass
100% Load34.1mV24.8mV35.4mV13.3mVPass
110% Load36.0mV27.1mV40.2mV14.7mVPass
Cross-Load 119.1mV13.9mV10.6mV6.7mVPass
Cross-Load 233.3mV23.7mV32.1mV12.6mVPass
Image 1 of 4

Ripple suppression is pretty good at +12V and 5VSB, decent enough at 5V, and satisfactory at 3.3V. Remember that this is an SFX unit with limited space on its mainboard, so the number of filtering caps is kept low. Really, you can't fairly compare such a compact platform to larger ATX PSUs.

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 0.01 V/Div (each vertical division/box equals 0.01V) as the standard for all measurements.

Ripple At Full Load

Image 1 of 4

Ripple At 110-Percent Load

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Ripple At Cross-Load 1

Image 1 of 4

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, covering PSUs.

11 Comments Comment from the forums
  • shrapnel_indie
    How many motherboards require more than one EPS connector in the entry to enthusiast level motherboards (excluding server boards)? How many server boards? How many enthusiasts actually use server boards?

    IMHO, if a PSU has 1 or 2 EPS connectors shouldn't be a pro or con as the vast majority of boards used from entry level to enthusiast only really requires one connector. Server boards are a different matter. IMHO, just making a clear note how many EPS connectors should be good enough.
    Reply
  • TMTOWTSAC
    I can see wanting more than 2 PCIe of course, but how many SFX models come with 2 EPS? How many dual CPU micro atx mobos are there anyway?
    Reply
  • Ne0Wolf7
    Why would you ever want there not to be a power switch? I use mine all the time... It seems like such a simple thing to add too.
    Reply
  • 10tacle
    ^^That's the first thing I noticed in the pictures. I use mine on occasion too, especially when getting lockups during overclock testing. Flicking a switch is a lot more convenient than reaching around and unplugging and making sure the cable doesn't fall down behind the desk causing colorful four letter language. Unwise omission that is inexcusable in this category of PSU. I would rule out this PSU just for that omission alone.

    Reply
  • Aris_Mp
    about the two EPS connectors, most mid to high-end mainboards use one EPS and one ATX12V (so they need two CPU connectors) especially the new ones. Why not have this option and be restricted to mainstream mainboards. Not only server or dual CPU mainboards require two EPS connectors.
    Reply
  • Marcus52
    Enermax still hasn't recovered their quality since they shut down their own production facilities, which is a real shame, they used to be one of the best.
    Reply
  • superflykicks03
    You guys literally have ads that play over the top of your intrusive popup videos. You literally have to watch a 30 second ad before you get to watch the unwanted video :/ Not exactly user friendly. I know I know revenue blah blah, and just get a popup blocker yadda yadda.
    Reply
  • maxwellmelon
    Why would you turn off the power on the power supply on computer lockup. Just hit the reset switch. I would venture to say 9 out of 10 people could care less as there pc is always on.
    Reply
  • 10tacle
    Because hitting reset from the case button does not guarantee a solid reboot. On my system anyway.
    Reply
  • warmon6
    For an SFX psu, not having a power switch on the PSU doesn't bother me to much.

    Depending on the case design (like my rvz01), you couldn't access the psu without taking the computer apart to access that switch. So unplugging the computer or holding the power button for 5 seconds would be a lot faster.

    Now if this was an ATX PSU i would give a bit more care for as it's extremely rare for an ATX psu to be placed somewhere else inside the case that cant be access from the outside.

    @10TACLE

    I do have to ask though, does your computer lock up so much that even holding the case power button for the 3 to 5 seconds does nothing?

    Most computers I've messed with seems to be able to power off fully even when there is a hard lockup doing that method.

    But i do agree with you about that hitting a reset doesn't guarantee a solid reboot. Certainly when trying to dial in overclock settings.
    Reply