tcole

Looks like the custom curve is a PWM %. I think I'll return these Noctua Industrials and just stick with the chromax ones. I've also thought about sticking with the LL120s, but they are noticeably louder. I'm aiming to make this PC nearly silent, since it sits right on my desk... Thanks for the help!

I just tried what you suggest with one LL120 that came with the cooler, and a Noctua Industrial 2000. If I set a custom profile with the fan RPM set at various values. The Noctua will spin up, but it's RPMs seem to keep swinging up and down... That led me to try a few different things. With a custom profile, Fixed %, the Noctua fans won't turn on at all unless I set it to 100%. However, Fixed RPM, they will spin up, even at the lowest RPM, 360. I know these fans have a minimum rotational speed of 450 RPM (+/1 20%). I can actually connect only Noctua Industrials and they spin up when I set a Fixed RPM. But they won't hold a constant RPM. They swing all over the place. See the RPMs here: Anything else I should try? I'm pretty sure this was because I was comparing totally different fan RPMs. Max RPM with the industrials and quite low RPM previously. I wasn't looking closely at coolant temperature. I did let the test run for 10-20 minutes before considering the temperature stable. But your point is well taken regarding coolant deltas. I'll take that into account if I setup some custom fan profiles. Thanks.

I'll give that a try, but I suspect you're right about incompatible PWM. I should have said CPU package temp. It went from about 68C to 58-60C under full load. Though the fans were not quiet, but now that I'm looking at it again, I see the issue. I think you're right, something was off with my test. Re-running my test now with the chromax fans and it looks like the other variable was the fan RPM. I'd just been using the stock fan profiles in iCue and even under full load with prime95 and the chromax fans on the Extreme profile. The fans generally hang out around 600-800 RPM. The industrial fans were *only* turning on at 100%. So that's probably the real difference here. If I switch to a custom profile with 100% fan RPM with the chromax fans, I see the CPU package temp go from 68-70C down to 58-61C. This is as good as I was seeing with the industrials, so not sure if it's worth the trouble to figure out why they were not working. Thanks for pointing out the flaw in my testing.

Hi there, I've just put a pair of Noctua NF-F12 IndustrialPPC 2000 PWM fans on my H100i RGB Platinum. But they only seem to spin up when I set their RPMs to 100% in iCue. Otherwise they just won't spin. This is when connected to the fan headers coming off the H100i's pump. If I use a Y-cable to connect them to the motherboard fan header, they spin up just fine. But I lose the ability to control them with iCue, and all the other benefits of being controlled by the H100i. These fans keep my Ryzen 7 3700x a full 8-10C cooler when stress testing with Prime 95, vs the Noctua NF-F12 chromax that I had on before. The chromax worked fine when connected to the H100i's fan headers. Anyone run across this and have a solution? Or have any idea what could be going on here? Thanks!