I've got the LF 360 v2 and I'm having the same problem. The pump is working but no RPM is reported to mainboard. It's connected to the pump header and the fans to the CPU fan header. 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. Steve from GamersNexus explains you the mistakes to avoid while assembling your water cooling AIO in your PC case.

Installed this about 2 months ago. Quietest AIO I ever used all why keeping temps lower than my Kraken X72. This one in the review looks really nice as well. I wish more manufacturers would stop making their products look like action figure toys. 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).

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I am just waiting for the 360mm one to be available and then I will buy!!!! Looks very good in terms of performance... I have one of their older 120 models (push pull) on an R7 1700 (non-x, but OCd to 3.8)- cools extremely well and is super quiet - I only hear it when 3D rendering (100% load for more than a few minutes). 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. It's 100% "Harness" speed on the V1 that is reported on only one of the fan connectors. It's not pump nor VRM. They don't have a sensor at all.

Edit: and yes, similar to OP, I am OCD and need to have every fan in my case match (noctua for me). Plus, our sophisticated cable management hides the PWM cables of your radiator fans in the sleeving. As Cinebench R23’s multi-core benchmark will push coolers to their limits, it’s also a great test for recording the worst-case scenario of fan noise levels. Here the results are a bit different than above, with the Liquid Freezer II providing the second quietest performance of all the coolers we’ve tested. Only Thermalright’s single-fan low-profile AXP120-X67 air cooler is quieter, although that cooler is the worst performer in the previous test. 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. The increased cooling challenges posed by Raptor Lake mean that we’ve had to change some of the ways we test coolers. Some coolers were able to pass Cinebench R23 multicore testing with Intel’s 12th Gen i9-12900K when power limits were removed (although only the strongest models were able to pass that test).Arctic has built, thus far, a good product. We need to see how it does long-term, as Enermax has scared us away from firm recommendations on thermals alone. We would recommend the Arctic Liquid Freezer II 280 as a go-to solution over competing liquid coolers, based on thermal and acoustic performance, although we’d also note that most proven (e.g. Asetek, CoolIT) coolers will perform similarly. If you want RGB LEDs, you’re mostly just paying more for them, but should be in the ballpark for performance.

Modern AMD & Intel CPUs are designed to run fairly hot without any problems– up to 95 degrees Celsius for AMD Ryzen 7000 CPUs, and up to 100 degrees C for Intel’s Core i9-13900K. Similar behavior has been standard in laptops for years due to cooling limitations in cramped chassis. 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? Hydro Series H100i v2, and couldn't be happier! This cooler is everything the Corsair was not...... FAReasier to install, MUCH quieter, and keeps my Ryzen 2700X 7-10 degrees cooler across the board then the Corsair. The CPU and CPU OPT headers are not individually controlled. They are controlled together, but can report speeds individually.This seems like a top contender for the best 280mm AIO. Great job on Arctic's side of things. The only thing left to test is whether or not there will be more or less horror stories with them, as well as, how many are DOA and the longevity of each cooler. I get some relief that you have the same issue as it points that it is by design and not a faulty unit. Time to move to VRM thermals. Before putting this chart up, a few important points: First, this is all relative, so our measurement points aren’t designed to test the motherboard, but rather to test the cooling capabilities of the CPU cooler on top of it. We’re taking VRM measurements at points that will work better for testing cooler impact, since we don’t care about comparative VRM performance from one board to the next. Second, we’ll show the numbers with the radiator mounted to the side of the bench. That’s how we tested all the liquid coolers so far, as it is more similar to a top-mounted radiator in a case. This means there’s always airflow over the VRM heatsink in all the CLC tests, whereas testing it on the table, away from the VRM, would paint a picture of Arctic’s VRM fan having a higher relative impact since you’d be taking away all cooling otherwise. We have these numbers too, but let’s focus on 3950X OC numbers at 35dBA radiator fan speed first, with the Arctic VRM fan at 100%. The test is also tough to standardize since every motherboard will have different heatsinks and positioning, so although you can mostly extrapolate out a hierarchy, it’s not perfectly comparable to every configuration. And again, please also remember that case configuration is the single most impacting to VRM thermal performance outside of the VRM design and cooling solution. What we’re saying is that this test will create an objective hierarchy, but that in all reality, a couple degrees here-and-there from the cooler won’t really matter much when considering the VRM is unlikely to melt itself in the majority of instances. 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. How does it compare with the Corsair H150i Elite Capellix AIO (360mm)? I'm surprised you never had them in your test rig, Corsair being the most popular AIO manufacturer.