Testing Results, Low Fan Speed

Using a PWM voltage regulator, we reduced the speed of the fans manually down to half their rated speed, which is 1080-1100 RPM. The pump was also connected on the same power source, functioning properly at this low speed setting.

Average Thermal Resistance

Core Temperature, Constant Thermal Load (Low Fan Speed)

All three of SilverStone’s Permafrost coolers perform very well in this test but it is the PF 360 that really stands out, as it managed to outperform virtually every other cooler that we have ever tested. Despite the massive airflow drop, the thermal permittance of the PF 360 rose only up to 0.0821 °C/W. This is especially interesting because of the low noise output that, in combination with the high thermal performance, makes the PF 360 one of the most efficient coolers that we have ever tested.

Fan Speed (7 Volts)

The Permafrost 120 and 240 also do well in this test, although they can win no medals. Their thermal performance figures are comparable to competitive products, some of which were released many months before the Permafrost series hit the store shelves. The acoustic performance of the new Permafrost coolers is a little better than that of many older coolers, making them a little more comfortable to use. This difference, however, is relatively small and most users will definitely neglect it if other factors, such as availability and retail price, come into play.

Noise level

Testing Results, Maximum Fan Speed Thermal Resistance VS Sound Pressure Level
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  • PeachNCream - Wednesday, June 17, 2020 - link

    I can't see advantages in adding software and hardware complexity purely for lighting, but addressable RGB seems to be doing just that. More lines of code in which to make errors, more hardware that can fail, and a bigger software footprint for possible compromise and exploitation (nevermind the possible requirement of internet connectivity and awareness of said control software like Razer seems to require which is a by-design potential security problem).
  • eastcoast_pete - Wednesday, June 17, 2020 - link

    Agree! I wish reviewers could add (estimate) just how much the LEDs and associated hardware add to the BOM. I'd rather have an AIO cooler for $ 5 less with no lightshow.
    The only time any LED lighting of the cooling fans could be useful if they would activate or change colors with the CPU temperature (e.g. green, yellow, red); that would, at least, be of interest and tell me if the cooler is doing its job.
  • QB the Slayer - Wednesday, June 17, 2020 - link

    Well... as much as I agree. I do have a bunch of RGB stuff that I really only have since it came with the gear I purchased. But since I have it, I might as well use it! So I have ALL my RGB linked and it actually is linked to the CPU temp... Nice and cool blue when 45°C or less and burning hot red at 85°C or above. MB has 5, GPU has 20, AIO has 16, and mouse has 2... again nothing I went out of my way to get, but they are there. JackNet RGB Sync is a handy little app for this. All this does have a cost though... 3 apps must be running and they are not light in any way (iCUE, G HUB, and JackNet). Thankfully iCUE has an ASUS plugin so that doesn't have to run and the GPU and board can be linked with a cable so no app for the GPU either... Ugh, I am rambling now, sorry guys.

  • PeterCollier - Wednesday, June 17, 2020 - link

    Repeat after me: AIO cools no better than air and will leak.
  • PeachNCream - Wednesday, June 17, 2020 - link

    Would be nice to see a couple of air coolers in the benchmark charts just for the sake of completeness. I wonder if that would paint these liquid coolers in a poor light though.
  • BenSkywalker - Wednesday, June 17, 2020 - link


    AIO wins easily which shouldn't surprise anyone. The best air coolers can best the worst AIOs by a little providing you are ok with a cluttered sloppy build and rarely need to open your case for anything and you like having more noise.
  • khanikun - Wednesday, June 17, 2020 - link

    Imagine if they tested in a hot room. I have 3 desktops. 1 on custom loop and two on AIO (one Cooler Master and one Corsair). I use to live in Germany, where they don't seem to believe in A/C. So my computer room easily climbed into 85-90F. I couldn't keep any of my machines cool on air.

    I seem to be doing alright with my AIOs or my custom loop. My Cooler Master AIO was just $55. My Corsair AIO was $115. I have no idea how much my custom loop was, like $500. Owned each of them between 2-3 years now.
  • Lord of the Bored - Thursday, June 18, 2020 - link

    I can't imagine your computers running 85-90F in a room with no AC. Because that is sub-ambient right now where I am.
    Air conditioning is God's gift to Texas.
  • Lord of the Bored - Thursday, June 18, 2020 - link

    I misread that. Computer room != computer.
  • khanikun - Friday, June 19, 2020 - link

    Ya, computer room. My CPU sits around 30-35C for my custom loop (dual 360 rads/push pull fans), depending on whether it's winter or summer. My AIOs are in the 40s (240 rads/push pull fans).

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