Corsair H100i PRO RGB Liquid AIO CPU Cooler Review

Corsair has just unveiled its new model Hydro AIO H100i CPU AIO cooler. These work with all new AMD and desktop Intel processors. Its new claim to fame is super quiet magnetic levitation fans. As usual, cooling our highly overclocked AMD Ryzen CPU is our focus, so how does it cool when pushed to the limit?

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Results: Temperatures

Testing will be done on our Ryzen 7 1700 processor overclocked to 3.9 GHz at 1.475 volts. This represents a very high wattage load. The software used for testing will be Prime95 v29.3 with SmallFFTs for the CPU load. We found Prime95 with Small FFTs load to give us repeatable results, as well as being the preferred load testing software for some major hardware manufacturers. FurMark 1.19will be stressing the GPU in the combined test, and everything will be monitored using HWiNFO 64 v5.57, and AMD's Ryzen Master. You can see our full explanation of system build-out and testing procedure outlined in this article.

We will be performing two, one hour test runs, one with Prime95 only, then a test with Prime95 and FurMark running simultaneously, both inside a closed case. Temperatures from the "tdie" sensor, as well as all hardware thermocouples, and package wattage will be recorded every 5 minutes.

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The H100i PRO provided outstanding performance in both the CPU and Combined testing. Throughout the CPU-only test it was extremely consistent with a low temperature of 73.3c and a peak of 75.3c, putting it's average firmly with the top performers.

In the combined test, the H100i PRO managed to surprise us even more. Once again it was impressively consistent, with a low temperature of 75.5c, and a peak of 77.8 it managed to outperform even it's bigger 360mm brother, the H150i PRO.

Sound Profile and Loudness

Sound testing is done from a distance of 4 feet from the side window of the case, with case fans at 60% speed which we have found to be just barely audible. With everything turned off and the room completely silent the meter registered a sound level of 39dB(A).

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And here is where we see how it managed to beat the H150i PRO in the combined testing. The ML Magnetic Levitation fans included with the H150i PRO ran at a max of 1600 RPM in our testing. The H100i PRO's ML fans spin up to a staggering 2450 RPM according to Corsair's software. The pump runs at 2,750 RPM in it's maximum mode, and for all intents, is "silent," the fans however, are not. The sound profile from these ML magnetic levitation fans is honestly amazing. When spun up to their maximum 2.450 RPM there is no buzzing, rattling, or humming to be found, just a low roar of the huge amount of air rushing through the radiator. While running the H100i PRO at 100% all the time would be overbearing to say the least, it was not an unpleasant sound that we found bothersome of overly annoying.

Software and Fan and Temperature Control

While he H100i PRO can be controlled with the familiar Corsair LINK software, which is even mentioned on three sides of its box, it really shines using Corsair's new iCUE software. While iCUE is much heavier than LINK, with a drive space requirement of 628MB, it does allow for more customization, control, and monitoring of the cooler. Within iCUE you can choose different profiles for each fan as well as the pump, or make your own custom curves control the RGB lighting, and get graphs of all the goings on with the cooler.

One such profile that Corsair is bringing is the new "Zero RPM mode." While we were highly skeptical of this with how much heat our overclocked Ryzen 1700 can produce, the mode seems to work. Using the H100i PRO's coolant temperature sensor, the fans remain off until the coolant reaches 40c, at which point the CPU die temperature was at 85c when the fans near silently came up to 500 RPM. We let Prime95 and FurMark run for 15 minutes and during the short test the CPU die remained at 87.3c, the coolant temperature at 46.7c, and the ML series fans very quietly floated between 700 and 900 RPM. While this was very impressive, we would only use it for very idle tasks such as web browsing or the like. With the coolant temperature at 46.7c, the heat coming off the radiator was immense, and while we have little doubt that the software and ML series fans will adjust as necessary, a long session of CPU intensive tasks would be better served with a more traditional fan profile.

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