ARCTIC Liquid Freezer II 360 - Multi-compatible All-in-One CPU AIO Water Cooler, Compatible with Intel & AMD, Efficient PWM Controlled Pump, Fan speed: 200-1800 rpm, LGA1700 compatible - Black

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Some mechanical interference with surrounding components may appear. The fan will not be controllable by PWM. Our next chart continues with the 3950X 200W load, but allows all the coolers to run at 100% fan speed during the test. This doesn’t move the needle much for Arctic, which seems to top-out in its efficiency at around 1200RPM rather than its maximum 1600RPM. The results were +/-1C as usual, but our average ended up at 50.9 degrees over ambient. That’s not enough of a change, so there’s room to reduce noise level without much loss of overall performance. At the 1610RPM speed, the Arctic cooler ran at 42.5dBA at the normal 20” distance. This puts it about equal in thermal performance to the NZXT Kraken X62 and X72, which run around 51-53dBA, or a perceived noise increase to the human ear of about 2x. Again, that’s perceived to the human ear, not acoustic power, which is a different scale. Either way, Arctic’s solution is significantly quieter at the same performance. The EVGA CLC 360 shows that we’re not limited by our test bench, but also that jet engine levels of noise are needed to drive the temperature down further. 3800X – 35dBA

Small fans have the reputation of being particularly loud and not very durable; that’s why we set out to develop a quiet, sturdy diagonal fan especially for the Liquid Freezer II. We’re 100% convinced that this 40 mm fan is just as durable as our other case fans. If the fan doesn’t live up to our claims, our customer service team will send you a replacement free of charge (without you having to replace the entire unit). Albert.Thomas said:I'll be extremely impressed if I ever find a cooler capable of handling it full bore :)Time to step into 420mm territory? XD I separated the fans from the pump and connected the radiator fans to cpu fans and the cable coming from the LFII into the pump header. I am not getting any pump RPM value. I thought it may be because it could be a 3-pin “fan” but even still I should have RPM value. I have used that header with other pwm fans in the past and it read RPM no problem. While it was fairly easy with previous generations of CPUs for coolers to keep the flagship i9 processor well under TJ max (the maximum temperature a CPU can sustain without throttling) in tough workloads, this is no longer realistically possible with the Core i9-13900K without extreme cooling (or enabling power limits). While in the past a CPU hitting its peak temperature was cause for concern, enthusiasts are going to have to learn to accept high temperatures as “normal” while running demanding workloads with Raptor Lake and Ryzen 7000 CPUs.

Small fans have the reputation of being particularly loud and not very durable; that’s why we set out to develop a quiet, sturdy diagonal fan, especially for the Liquid Freezer II. We’re 100% convinced that this 40 mm fan is just as durable as our other case fans. If the fan doesn’t live up to our claims, our customer service team will send you a replacement free of charge (without you having to replace the entire unit). Er ... this thing costs less than half the price of a h100 pro ... and cools within 0.1 degree (by the data that you yourself linked) ... not to mention PWMs @ over 50% cooler with this AIO.

But are you sure the fans are the issue? the P12/14 on the AFII are already pretty decent fans. You're not going to see massive improvements unless you're going to get something with much higher speeds. It's impressive even the Arctic Freezer 360 has issues cooling a 13900K at full bore... It's kind of scary, really.

When can the problem occur?

admin said:System builders with an aversion to RGB lighting who seek a liquid cooler with distinct attitude should put Arctic’s Liquid Freezer II 280 cooler on their short list.

So does this mean that the pump and vrm fan are always running at 100% and the only thing that’s being controlled by pwm are the fans? The majority of Liquid Coolers on the market today are based around Asetek designs, but the Liquid Freezer II features a pump which was designed in-house by Arctic, with the goal of quieter operation and higher efficiency. Like its fans, the water pump is PWM-controlled and will adjust its speeds. This decreases power consumption and leads to lower noise levels in lighter workloads.

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I just hooked up one of my Noctua 3000 RPM fans and plugged it into an empty harness port. It reported 2700 RPM (from the Arctic fan).