Corsair RM650x PSU Review

Another Corsair PSU is in the lab, commanding our attention. We already reviewed the RM750x and RM550x, so we couldn't leave out the RM650x. It promises the same high performance as its siblings, along with super quiet operation.

The most popular power supplies among enthusiasts who do their homework come from EVGA's G2 and P2 families, and Corsair's RMx and RMi line-ups. You simply cannot go wrong with any of them. At least in the U.S., those companies do battle with each other, leaving everyone else behind.

EVGA puts its trust in Super Flower, one of the best OEMs out there. Unfortunately, it looks like Super Flower is having a hard time keeping up with demand. On the other hand, Corsair cooperates closely with CWT. It also has an in-house team of PSU engineers who not only make changes to CWT's platforms, but actually help design them. We've reviewed two members of the RMx line and their results were amazing. We expect nothing less from the RM650x on our test bench today.

Like all RMx models, the RM650x is 80 PLUS Gold-certified, features fully modular cabling, and is equipped with a medium-speed rifle bearing fan. Its platform is shared with the RMi family; Corsair simply leaves off the digital interface that allows the PSU to communicate through its Link application. On top of that, the RMi units use a higher-quality FDB fan. The price difference between the RM650x and RM650i is $20 bucks, and we think that delta is justified given the higher-end unit's extras. But if you're on a tight budget and don't care much about the digital interface, you should be fine with the RM650x.

Specifications

This PSU delivers its full power continuously at up to 50 °C. That fact alone means the platform is equipped with heat-tolerant components, which is important since thermal energy is a major threat to stable power. Moreover, Corsair provides a full set of protection features, including OCP for the minor rails and over-temperature protection.

Apparently, Corsair is confident enough in the RM650x to arm it with a 10-year warranty. The medium-speed rifle bearing fan is controlled by a conservative profile, and a semi-passive mode keeps the fan inactive under light and moderate loads. Finally, the PSU's physical dimensions are normal for its capacity.

Power Specifications

Rail3.3V5V12V5VSB-12V
Max. PowerAmps25255430.8
Watts130648159.6
Total Max. Power (W)650

The minor rails can provide up to 130W, which is enough for most systems. Meanwhile, the +12V rail delivers up to 54A. Taking into account the low power consumption of AMD's and Nvidia's newer GPUs, 650W should be enough for two high-end graphics cards and a potent CPU. We also think the 5VSB rail is strong enough for a mid-capacity PSU like the RM650x.

Cables And Connectors

Modular Cables
DescriptionCable CountConnector Count (Total)
ATX connector 20+4 pin (610mm)11
4+4 pin EPS12V (660mm)11
6+2 pin PCIe (600mm+150mm)24
SATA (520mm+110mm+110mm)3
9
Four-pin Molex (450mm+100mm+100mm+100mm)14
FDD Adapter (+100mm)11

As we noted in the RM550x review, all RMx units use Corsair's "Type 4" cables that feature capacitors on the ATX, EPS, and PCIe leads to further suppress ripple. In addition, the ATX cable has four more wires that help maintain tight load regulation. The connector count is satisfactory for this PSU, except for the single EPS connector. We think Corsair should provide a second one.

At least the Berg connector is provided as an adapter, and not fixed on a cable. It's only a shame that the adapter doesn't feature a pass-through Molex connector, so you lose one of the provided four when you attach it.

With only 10cm separating the peripheral connectors, you may have a hard time with some enclosures. Corsair should put at least 15cm between these connectors. Lastly, most of the cables employ 18-gauge wires, satisfying the ATX spec's recommendation.

Power Distribution

Since this PSU features a single +12V rail, we do not have anything to say about its power distribution.

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  • maxwellmelon
    for all the good listed in this article, this series of psu just gets bashed in the fourms, just interesting.
  • basroil
    1432275 said:
    for all the good listed in this article, this series of psu just gets bashed in the fourms, just interesting.


    You're thinking of the older RM650, different design.

    The review here just made this unit be one of my recommended 650 models, tied with the EVGA G2/P2 and just below the Seasonic 660XP2!
  • pjc6281
    I have had this PSU for my new Skylake build for 2 months. Its GREAT, quiet and even have it pushing my old dinosaur Nvidia 590 with no problems. My old power supply was a Corsair AX1200 that was rock solid as well. Nothing but good experiences with them. I know others differ.
  • SR-71 Blackbird
    RMX doesn't get bashed , RMX and RMI are very very good. I own the RMX 850 , GREAT UNIT.
  • TechyInAZ
    I'm glad the new RM series is much higher quality. All I remember Corsair having is a bunch of bad PSUs with select few good PSU (like AX and HX).

    I hope this same kind of quality intros into other models like the newly refreshed CX PSUs.
  • anort3
    1432275 said:
    for all the good listed in this article, this series of psu just gets bashed in the fourms, just interesting.


    Yeah, I believe you are confusing the RMx and RMi with the older, mostly discontinued RM line. And of the old RM line only the 750w and 850w versions that were first made by Chicony Power Technology had the bad reputation. Anyone bashing the RMx and RMi doesn't know what they are talking about. Once misinformation gets out there it's hard to get it corrected though.

    Another great review Aris! :)
  • Nintendork
    Why buy Corsair or EVGA when you can get a Seasonic?
  • anort3
    205977 said:
    Why buy Corsair or EVGA when you can get a Seasonic?


    Seasonic doesn't have a lock on quality. They also don't offer a 10 year warranty which both Corsair and EVGA do on some models. Just off the top of my head Flextronics, CWT and SuperFlower are all capable of making units that are at least equal to high end Seasonic quality. There are others as well.
  • TechyInAZ
    218893 said:
    205977 said:
    Why buy Corsair or EVGA when you can get a Seasonic?
    Seasonic doesn't have a lock on quality. They also don't offer a 10 year warranty which both Corsair and EVGA do on some models. Just off the top of my head Flextronics, CWT and SuperFlower are all capable of making units that are at least equal to high end Seasonic quality. There are others as well.


    Plus, efficiency levels are typically better with EVGA than Seasonic.
  • anort3
    1695593 said:
    218893 said:
    205977 said:
    Why buy Corsair or EVGA when you can get a Seasonic?
    Seasonic doesn't have a lock on quality. They also don't offer a 10 year warranty which both Corsair and EVGA do on some models. Just off the top of my head Flextronics, CWT and SuperFlower are all capable of making units that are at least equal to high end Seasonic quality. There are others as well.
    Plus, efficiency levels are typically better with EVGA than Seasonic.


    :??: Not sure what you mean. EVGA has a couple of 80 Plus Titanium models but Seasonic has Titanium models in their new lineup. I'm not sure if those new Seasonic models are available yet though. Other than that I've had an 80 Plus Platinum Seasonic ( 660XP2 ) for a couple of years and their Platinum line has been out since at least 2011.
  • TechyInAZ
    Sorry I should of clarified. I mean the SuperNOVA G2 vs the gold 550W Seasonic PSUs.
  • SR-71 Blackbird
    The last few I have purchased are RMX , love them.
  • turkey3_scratch
    205977 said:
    Why buy Corsair or EVGA when you can get a Seasonic?


    Seasonic is not perfect. Many users are actually experiencing issues with Seasonic's Platinum lineup of units http://www.jonnyguru.com/forums/showthread.php?t=11038
  • SR-71 Blackbird
    All manufactures have issues two more PM's today , one about a DOA EVGA 600B and , 1 about a DOA Seasonic S12 , it happens , I told them , even the great ones have a few mixed in.
  • turkey3_scratch
    276663 said:
    All manufactures have issues two more PM's today , one about a DOA EVGA 600B and , 1 about a DOA Seasonic S12 , it happens , I told them , even the great ones have a few mixed in.


    But in this case there is a lot of people experiencing similar problems on Seasonic Platinum based units. Not that random DOA unit.
  • SR-71 Blackbird
    I was talking problems in General , all units have some any brand can have a few hiccups.


    That never brings a solid brand down.

  • turkey3_scratch
    That's what I love about these RMx units, it's near impossible to find a hiccup.
  • SR-71 Blackbird
    I love them , very impressed by the SF series too.
  • powernod
    Aris keeps making his reviews wider & even more detailed! His new addition , "evaluating protection features", is another crucial addition at the PSU Review field!! If he continoues this way, soon , every review of him, will be a standalone book!!:wahoo:
  • dark-ice
    I wanted to buy an EVGA P2 650W but amazon doesn't have stock, so I think I'm going to buy this one instead.