Cold Test Results (~25°C Ambient Temperature)

For the testing of PSUs, we are using high precision electronic loads with a maximum power draw of 2700 Watts, a Rigol DS5042M 40 MHz oscilloscope, an Extech 380803 power analyzer, two high precision UNI-T UT-325 digital thermometers, an Extech HD600 SPL meter, a self-designed hotbox and various other bits and parts. For a thorough explanation of our testing methodology and more details on our equipment, please refer to our How We Test PSUs - 2014 Pipeline post.

The Be quiet! Pure Power 12 M 650W adheres to the 80Plus Gold certification criteria, demonstrating commendable electrical conversion efficiency. Specifically, when supplied with a 115 VAC input, the unit exhibits an average nominal load range efficiency (spanning from 20% to 100% of its capacity) of 90.7%, and 92% when powered by a 230 VAC source. The peak efficiency of the unit takes place at 50% load and is at 93.4% or 92.6% for an input voltage of 230 VAC or 115 VAC respectively. These figures align well with expectations for a product within its efficiency class.

The Be quiet! Pure Power 12 M 650W PSU does not feature a "hybrid" fan mode, resulting in the fan being operational from the moment the power supply is activated. However, due to its design, the fan maintains a low speed for up to 60% of the load capacity, which helps in keeping the unit operating quietly, especially under standard conditions at room temperature. As the load surpasses approximately 400 Watts, the fan's speed increases significantly to address the increased thermal output of the PSU. The internal temperatures of the unit remains low at all times, with the thermal control circuit being particularly aggressive when the load is greater than 500 Watts.

Introduction, Examining Inside & Out Hot Test Results (~45°C Ambient)
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  • nikaldro - Monday, March 11, 2024 - link

    2024 and they still want 100 bucks for 650W?
  • PeachNCream - Monday, March 11, 2024 - link

    Yeah, a third of the price of a laptop for just a PSU. Worse news is that PC hobbyists are muppets and will continue their empty-headed spending. Dolts will go right on buying as long as a review reinforces existing desires, but if not computer bits it'd be something else like LEGO or Star Wars toys or automobiles (something that can actually kill others more readily) so it may as well be a power supply that captures those with soggy bibs and short attention spans.
  • blwest1978 - Sunday, March 24, 2024 - link

    Does anything make you happy in life or is this it? Why do you care what makes people happy? Why do you call everyone names?

    I almost feel sorry for you. Almost.
  • mindless1 - Sunday, May 5, 2024 - link

    Better question is why would it not bother you when people just parrot something they read, without really understanding it, then proceed to regurgitate information when some senseless post about products come along asking the question "what is best"?

    It matters what makes people happy because of the colossal waste, the spread of misinformation, and the time that could have been used more productively. In short, big black hole of fail.

    Now here you come along and try to pretend to take the higher road, yet it isn't even on topic at all, just a personal attack. Clearly if this is what makes you happy, it is not time well spent.
  • qwertymac93 - Monday, March 11, 2024 - link

    Isn't that a good thing? I bought a well reviewed, semi-modular 550w power supply for $70 back in 2011, with inflation that's right around $100. It's still powering my overclocked 12700k and 3070 without issue. 100w more, fully modular, with better efficiency all for the same price seems like a fine enough deal to me.
  • LauRoman - Tuesday, March 12, 2024 - link

    50$+ is not too high a price for peace of mind. I'm all for getting cheaper psus, if i know the oem behind that particular model and its behaviour compared with the model it's based on.

    Psus and storage are the two things i am most careful when recommending to others, because they're the two most likely hardware culprits to cause data loss.
  • Samus - Wednesday, March 13, 2024 - link

    Corsair CX and Thermaltake Smart-series PSU's range from $45-$60 for 550w-700w models. They are 80 Plus Bronze, though.

    I have the 850w Be Quiet Pure Power 12M, which is basically the same as this 650w unit, except it has 2x8-pin EPS 12v connectors instead of 1x8-pin+1x4-pin. And the 12vHPWR handles 600w instead of 450w. Personally I wouldn't trust the 12vHPWR connector with 600-watts anyway. I paid $93 for the 850w model at newegg during a promo in December but they regularly sell around $100. If you need a basic 600-650w just get a Corsair CX for half the price.
  • Oxford Guy - Thursday, March 14, 2024 - link

    'They are 80 Plus Bronze, though.'

    AKA garbage that has no business being produced anymore.
  • mindless1 - Sunday, May 5, 2024 - link

    Don't be silly, the majority of the market does not need a super high efficiency PSU, because most people aren't running at even half the load rating for the PSU, many hours a day.

    Often the higher efficiency rated PSU use superior quality components but remember that the average PC isn't using 500W+ even during gaming, and if you are using a small fraction of the total capacity, then the superior components often don't matter, nor would the savings on your power bill, ever make up for the difference in PSU cost within the reasonable lifetime of its service.
  • meacupla - Monday, March 11, 2024 - link

    I wish PSU manufacturers would stop using ribbon cables with 90 degree SATA power connectors in the middle.
    In my experience, the stiff ribbon cables snap off at the base of the plug or cause the drive side connector to warp/break.

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