Corsair CX650M PSU Review

Ripple Measurements

To learn how we measure ripple, please click here.

The following table includes the ripple levels we measured on the CX650M's rails. The limits, according to the ATX specification, are 120mV (+12V) and 50mV (5V, 3.3V and 5VSB).

Test12V5V3.3V5VSBPass/Fail
10% Load8.8mV8.0mV10.9mV11.0mVPass
20% Load9.8mV8.4mV12.0mV12.0mVPass
30% Load11.6mV8.7mV12.6mV13.7mVPass
40% Load12.7mV9.7mV13.3mV14.6mVPass
50% Load14.4mV10.1mV15.7mV16.3mVPass
60% Load21.2mV12.0mV16.2mV17.8mVPass
70% Load24.1mV12.9mV18.8mV19.3mVPass
80% Load26.3mV13.4mV18.0mV21.2mVPass
90% Load27.5mV13.5mV19.5mV22.7mVPass
100% Load31.8mV16.6mV23.4mV25.8mVPass
110% Load34.8mV18.0mV24.9mV28.0mVPass
Cross-Load 110.5mV10.0mV13.1mV13.2mVPass
Cross-Load 232.9mV15.9mV23.6mV25.1mVPass

Ripple suppression is amazing for this price category. The +12V rail exceeds 30 mV only during the full load and overload tests, while the 5V rail stays below 20 mV and the 3.3V rail doesn't exceed 25 mV in any case. The combination of electrolytic and polymer caps does an excellent job.

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 0.01 V) as the standard for all measurements.

Ripple At Full Load

Ripple At 110-Percent Load

Ripple At Cross-Load 1

Ripple At Cross-Load 2

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44 comments
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  • Dark Lord of Tech
    Thanks for the review on this new CXM platform.
  • JQB45
    Looks to be better then the old CX line up.
  • Onus
    Good to see that Corsair didn't produce a[nother] Turkey with this one.
  • turkey3_scratch
    Onus why would Corsair produce me?

    Anyway I think the price/performance page shows all. This thing rocks!

    Also Jonnyguru claims it is a rifle bearing fan that has the same model # as the sleeve variant.
  • benedict78
    Does the CX650 perform the same as the CX650M? I'm not interested in modularity anyway.
  • turkey3_scratch
    The CX650 is not out yet.
  • Aris_Mp
    I have several CM and CX-M units, which I plan to fully evaluate. So far I figured that there are differences (something natural of course) in their performance.
  • Dark Lord of Tech
    Could you put the newer CXM 750W OR 850W on deck soon , as they are widely use for DUAL CARD configurations.
  • turkey3_scratch
    The 750W and 850W CXM units are basically unchanged except for a bridge rectifier upgrade. Everything else is the same. Only the CX450-650M got the major revisions.
  • Dark Lord of Tech
    Yeah I know that , but want to see one reviewed , to compare top older generations.
  • Ryan_78
    Seems cool to be a CX now. Nice
  • bettsar
    After getting such high marks from the review, why no award?
  • Aris_Mp
    The CX750M is on the test bench right now. I don't have a CX850M sample.
  • Aris_Mp
    About the award. It should have a recommendation award but as it seems we forgot to add it. On it right now :)
  • Math Geek
    good to see them making a strong performer in a moderate price range. if they drop some massive rebates over the holidays like they do most years, this will be a super buy. i'm keeping my eye out to stock up on some. looks like a very solid buy.
  • atljsf
    the modularity is nice if you have a mini itx case, i have a cx500 and some of the unused cables are a bit inconvenient so that cx650m should be nice for those with not that small mini itx cases that can fit normal size psus
  • HERETIC-1
    Corsair spend $3 more and get all Jap capacitors and you'll have a good PSU.
    Oh you have-It's called the Vengeance series.(RECOMMENDED)
  • turkey3_scratch
    HERETIC you are severely misled. Do you realize there are Chinese capacitors of higher quality than Japanese? Do you realize how much ripple a capacitors handles and the environment the capacitors is in also affects it's lifespan a lot?

    Look at the thermal shots. The PSU is significantly cooler than was expected. That is fantastic for capacitor life. If you want to persist at judging power supplies based on capacitors country (and BTW a lot of Jap caps are outsourced to China) then you will be misled.
  • HERETIC-1
    So turkey are you saying Corsair's marketing "105C JAPANESE CAPACITORS"
    on their vengeance series is not necessary?
    I am more than happy to pay a little more when I see-
    "All electrolytic caps come from Nippon Chemi-Con"
  • turkey3_scratch
    The Vengeance series is a higher end unit than the CXM at a different price category for different countries. Not really fair to compare them.

    What more.could you possibly want at the price this thing sells for? This is the best value period and you have to find the need to talk about Japanese caps without even knowing the spec sheets of these caps used.
  • 10tacle
    "Finally, the number of provided cables and connectors is sufficient for this unit's capacity. And although it isn't fully modular, the native cables are absolutely necessary anyway."

    I've never understood the logic behind a "fully" modular PSU where all cables are completely disconnected and need to be plugged in. How exactly are you not going to use a PSU in a PC without the 20+4 pin ATX and 8 pin 12v CPU power connectors going to the motherboard?

    If anything, I'd want those connected directly during manufacturing to ensure nothing is lost (output or resistance) through a transfer connector port to the two most crucial power connectors.
  • atljsf
    202972 said:
    "Finally, the number of provided cables and connectors is sufficient for this unit's capacity. And although it isn't fully modular, the native cables are absolutely necessary anyway." I've never understood the logic behind a "fully" modular PSU where all cables are completely disconnected and need to be plugged in. How exactly are you not going to use a PSU in a PC without the 20+4 pin ATX and 8 pin 12v CPU power connectors going to the motherboard? If anything, I'd want those connected directly during manufacturing to ensure nothing is lost (output or resistance) through a transfer connector port to the two most crucial power connectors.


    the idea is that if you want a longer, half meter or a shorter, 15 centimeters long cable, you can change the one that came with the psu and put the one you need

    this is what most pc builders need this days, especially with mini itx cases where space is extremely limited
  • JQB45
    2011305 said:
    the idea is that if you want a longer, half meter or a shorter, 15 centimeters long cable, you can change the one that came with the psu and put the one you need this is what most pc builders need this days, especially with mini itx cases where space is extremely limited


    So If I buy power supply "A" for my mITX build and its fully modular but the cables are to long, where do I go to get shorter cables?
  • turkey3_scratch
    Cables cost like $100.