Cold Test Results

For the testing of PSUs, we use 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 Cooler Master V1200 Platinum performs very well at room temperature, with its efficiency peaking at 94.5% at 50% load. The average energy conversion efficiency within the nominal load range (20% to 100% of the unit's capacity) is 93.4%. As with all switching PSUs, the efficiency of the V1200 Platinum takes a dive at very low loads, dropping down to 79.6% with a load of just 60 Watts. The energy conversion efficiency climbs at such an extraordinary rate as the load increases that the energy losses do not increase at all within the 60 to 120 Watts output range.

Following the same pattern as Seasonic, Cooler Master optimized the V1200 Platinum for maximum reliability and low operating temperatures, sacrificing the acoustic performance of the unit. With the fan in Hybrid mode and with an ambient temperature of 25°C, the fan starts at just 20% load and its speed quickly climbs up as the load increases. Although the noise is endurable up to 40-50% load, the fan speeds up so much after that point that the noise output is already beyond typical tolerable levels. If the V1200 Platinum is running at nearly maximum load for a prolonged period of time (a few minutes or more), then the noise output goes above 52dB(A), an unreasonably high figure for typical consumer use.

The Cooler Master V1200 Platinum PSU Hot Test Results
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  • Essence_of_War - Friday, November 21, 2014 - link

    Good gracious, that is a LOUD fan!
  • Luscious - Friday, November 21, 2014 - link

    Your sound measurements are off.

    I have this power supply, and at 1200 watts it is quiet.
  • JarredWalton - Friday, November 21, 2014 - link

    What SPL meter did you use, what are the test conditions, what is the precise output load (in watts), and how far from the PSU are you measuring noise? My guess is: you don't have an SPL meter, your PSU is in a closed up case, the load is probably more like 700-900W at most, and you're sitting a few feet away. Remember, input power is not output power, and generating a load of 1200W would require basically four R9 290X GPUs running at max power with a bit of overclocking added in for good measure. There aren't many ways regular PC users would ever have a constant load anywhere near 1200W, and at 800W (which is still a lot for a PC) the noise is quite a bit lower.
  • bebimbap - Friday, November 21, 2014 - link

    I love these power supply reviews, esp the value statements in the conclusion. That is exactly how I would think.
    I especially appreciate the hot tests. They are tests a reasonable consumer could not easily perform at home.
  • Luscious - Saturday, November 22, 2014 - link

    I admire your attempt to uphold your article's credibility, but did you think for a minute that perhaps you received a flawed unit, or compare your results with those of other credible reviews already out prior to publishing your findings?

    Going into detail here regarding my setup would require a page and a half, however I will say that I was running four 780's pushing near 1200MHz and an overclocked 5960X at 1.25 volts. And that doesn't include the ~100 watts needed by the dozen Bitfenix PWM fans on the rads used to cool all of this. No, this was not in a closed case, the load being pulled from the wall was between 1150 and 1290 watts depending on the job being run, and I was not sitting "a few feet" away as you think I might have been.

    In the three reviews listed here, neither mentions this power supply being as loud as your review suggests:
  • Galidou - Sunday, November 23, 2014 - link

    What kind of an answer is that man, giving links that doesn't even match the message you're sending to the anandtech reviewer?

    Overclock 3D isn't a full review all he says is that it's quiet, no ambient room temperature no noise mesurement device based on his opinion only. One page review where half of the time on the video speaks about the ripple suppression and the overhype of coolermaster about that.

    Techpowerup comes to about the same results from 800 to 1200 watts power usage hovering around 51 to 54dba. Only results that differ a little are lower ambient temperature but again they use a custom anechoic chamber to measure noise that reduces the ambient noises to 20dba which is not normal usage, no one games in an anechoic room and some people are really used to outstanding ambient noise.

    Kitguru is the only one with very lower numbers but then again they use THEIR acoustic room, doesn't specify what kind of fan settings they are using and so on.

    Three reviews different on their testing methodology and you tell us you have a DOZEN bitfenix fans on the rad plus what other noise around you, no wonder why you think it's quiet, you live in the noise! what's your sound measurement tool? From what I can hear ''I was not sitting "a few feet" away'' your EARS?

    Goodbye! Brush up on your reading skills man nice system you have btw.
  • E.Fyll - Tuesday, November 25, 2014 - link

    I will simply comment that do not feel the need to "compare" my results prior to publishing them. And, trust me, I can tell if a unit is "flawed" or not.

    In the three reviews you mentioned, only one is actual, complete work and its results coincide with mine. Actually, since the floor noise of Techpowerup's setup is significantly lower, the PSU they tested appears to be even louder.
  • vred - Friday, November 21, 2014 - link

    I have Seasonic SS-1200XP3, and its fan is quite loud when the PSU is fully loaded. I replaced it with Corsair AX1500i, and the fan noise is day and night compared to Seasonic - really quiet. My system easily draws 1100-1300 watts with 4 watercooled Titan Black videocards and really allows those PSUs to show what they are capable of.
  • Flunk - Friday, November 21, 2014 - link

    "This makes it virtually unsuitable for users with very advanced gaming systems that try to keep them as quiet as possible"

    Who would that be? Anything that needs a 1200watt power supply isn't going to be quiet. Quad SLI systems are loud, even with liquid cooling.
  • E.Fyll - Friday, November 21, 2014 - link

    Well, it can be entirely quiet, but it will also be very, very expensive.

    The thing is, sound power and sound pressure are additive figures. This means that if you have a noise source that outputs a total SPL of 50dB(A) and add another device that outputs another 45dB(A) to it, you will have a system with a total SPL of 50+45 dB(A). That's NOT 95dB(A), the scale is logarithmic, so the exact math are X = 10log[(10^5.0)+(10^4.5)] = 51.193 dB(A).

    To make things simpler, no, I do not expect that such a powerful system will ever be entirely quiet. You can however build a system that is fairly comfortable for everyday use and gaming without terrible effort. But if you keep adding high noise sources, the total noise output of the system increases and it will sooner or later surpass that "comfort threshold". Ignoring the noise output of a power supply just because the rest of the system "is not quiet anyway" is very logical - a noisy power supply will make the entire system, which already is not quiet, even louder.

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