Noctua fan control11/9/2023 ![]() ![]() ![]() What is clear is, Aquacomputer (the manufacturer of the Aquaero fan controller) says the problem is entirely on the side of the fan. I am not an electrical engineer - however - and cannot comment on this. It is unclear to me why Noctua and EK are doing this (cost savings maybe?) According to the postings over there it has something to do with how/if the PWM signal is pulled up to 5.25V inside the fan per the Intel spec. I can confirm this happens with Noctua fans, but according to the Aquacomputer community forums, the latest EK fans are doing the same thing. Noctua appears to be aware of the issue, with unconfirmed reports of them assisting other customers by replacing their fans with older models that function properly. The really sneaky part about all this is that the change was rolled in without much fanfare, and unless you know the exact cutoff batch, there is no way of knowing if the Noctua fan you are buying has the old proper PWM implementation or the new problematic one. This is going to throw off just about every fan controller out there, resulting in a revvy peaky and overly loud fan control. So, you get no fan speed at all below 80% PWM duty cycle, then at 80% you get a very low fan speed, which ramps up exponentially until it hits 100% at 100. ![]()
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