Maximum Fan Speed

Our maximum speed testing is performed with both the fans and the pump of the kit powered via a 12V DC source. This input voltage should have the pump and fans matching the speed ratings of the manufacturer. SilverStone’s fans came close enough, with our tachometer reading 2180 RPM for the 120 mm fans and 1560 RPM for the 140 mm fans. These fans are rated at 2200 RPM and 1600 RPM respectively. Furthermore, the speed difference between the seven fans we tested was negligible, indicating great manufacturing quality and minimal tolerances.

Average Thermal Resistance

Core Temperature, Constant Thermal Load (Max Fan Speed)

A glance at the average thermal performance charts reveals a great surprise, with the IceGem 240P outperforming the 280 version and getting quite close to the 360 version as well. The 140 mm fans of the IceGem 280 are significantly quieter though, giving that cooler an advantage in acoustics. The average thermal resistance of 0.0745 °C/W is excellent for a cooler with two 120 mm fans, with the IceGem 360 sweating to get a tiny better thermal resistance figure of 0.0741 °C/W.

Fan Speed (12 Volts)

Noise level

When it comes to acoustics, all of SilverStone’s new AIO coolers do exceptionally well, with low sound pressure levels across the board. What is interesting to note here is the very low sound pressure level of the IceGem 280, which gives the product a significant advantage against other coolers – even against the other two IceGem coolers.

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 for the 120 mm fans and 800-820 RPM for the 140 mm fans. The pump was also connected to the same power source, functioning properly at this low speed setting.

Average Thermal Resistance

Core Temperature, Constant Thermal Load (Low Fan Speed)

The surprises continue in this test as well, with the IceGem 240P thermally outperforming the larger IceGem 280 even though the fans of the IceGem 280 should be pushing significantly more air through the radiator under these operating conditions. On the other hand, the IceGem 360 significantly outperformed the two smaller IceGem coolers and even the equally sized PermaFrost cooler by a very small margin.

Fan Speed (7 Volts)

Noise level

Even with these reduced speeds, the thermal permittance of the IceGem 360 rose only up to 0.0814 °C/W. In combination with the low noise output, that makes the IceGem 360 one of the most efficient coolers that we have ever tested. Although its thermal performance is not as great, we also received impressive sound pressure figures from the IceGem 280, which is nearly dead silent in this test. The IceGem 240P does not stand out in this test but it does perform comparatively well.

Thermal Resistance VS Sound Pressure Level

During our thermal resistance vs. sound pressure level test, we maintain a steady 100W thermal load and assess the overall performance of the coolers by taking multiple temperature and sound pressure level readings within the operating range of the stock cooling fans. The result is a graph that depicts the absolute thermal resistance of the cooler in comparison to the noise generated. For both the sound pressure level and absolute thermal resistance readings, lower figures are better.

This graph reveals that the IceGem 240P actually performs almost equally well, if not better, than the wider IceGem 280. We did not expect that the increase in the radiator’s thickness would be that beneficial, especially since the greater thickness also increases the airflow resistance of the radiator. We can also see that the IceGem 240P performs significantly better than SilverStone’s own Permafrost 240, which is using a 28 mm thick radiator. The IceGem 360 does outperform the smaller coolers when operating at low fan speeds but its thermal performance does not increase significantly with the fans operating at high speeds, making the cooler noisy for virtually miniscule improvements on the thermal performance.

Testing Methodology Final Words & Conclusion


View All Comments

  • YB1064 - Wednesday, July 21, 2021 - link

    RGB lights to make your eyes bleed. Who is the OEM? Do Silverstone make their own AIO? Reply
  • Scott_T - Wednesday, July 21, 2021 - link

    my next purchase will be a completely light proof case painted internally with ultra black to suck up all the rgb crap I didnt ask for. Reply
  • evilspoons - Wednesday, July 21, 2021 - link

    I have a Fractal Define XL R2 with opaque sides and a front door I almost always leave closed. The only light that leaks out of my case is from my 1080 with white LEDs and it works as a nice little nightlight. (I can't even remember if I left the RGB pattern on my mainboard on, I can't see it.) It's very nice that it just stays out of the way. Reply
  • Samus - Thursday, July 22, 2021 - link

    My Silverstone AIO cooler purchased a few years ago had Asetek hose clamps, so my guess is the entire thing was sourced from Asetek. It'd be a safe guess that this is still the case today, but who knows as this 280 model is a very proprietary-sized cooler and they could have done it in-house. Reply
  • Threska - Wednesday, July 21, 2021 - link

    Well one thing that comes to eye is the ease of installation. Reply
  • Oxford Guy - Wednesday, July 21, 2021 - link

    Which of the models tested have proper static pressure design fans instead of case fans? Reply
  • meacupla - Wednesday, July 21, 2021 - link

    In the article, just above the picture of the fan, it says they all use air blazer fans, which are high flow, low pressure.

    Considering the thickness and fin density of the radiators, I doubt using static pressure fans would make any difference.
  • Oxford Guy - Sunday, July 25, 2021 - link

    I remember a detailed fan testing article from here (a number of years back) that made it very clear that case (airflow) fans are optimal only for very low restriction scenarios and static-oriented designs should be used for restriction, such as radiators. I would like to see a chart that changes the perspective to ‘restrictive scenarios like radiators are fine for case fans if the fins are a certain minimum width’. Reply
  • Oxford Guy - Monday, July 26, 2021 - link

    The gaps between the fins, that is. Reply
  • citan x - Wednesday, July 21, 2021 - link

    Sometimes, I think your testing is too theoretical and not practical enough. I just happen to be looking for a new cooler for my Threadripper CPU and have been looking at reviews. When your article mentioned Threadripper, I though I might see some good analysis on how the size of the cooling block affects cooling performance. Yet, you failed to mentioned this anywhere except for a small blurb in the introduction. Does this mean the size of the contact area does not affect the cooling performance?

    I find this hard to believe cause I have seen other reviews where the coolers made for Threadripper do hold some advantage over coolers that are smaller. I am looking to get good cooling performance at a low noise level. I am trying to figure out if it is worth it to go for the few coolers that are made for Threadripper or to just get one of the top performing AIO coolers. This article however failed to address that.

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