![]() ![]() These fans run at constant RPM based on the input voltage (12V) and provide no tacho reading so the system cannot tell what the RPM is. * Apple Mac Pros don't use PC style PWM to control their fans, instead of a square wave switched input on pin 4 at different duty cycles (PC style) they use an analogue variable voltage.įirst a history lesson on fan pinouts Old school fans, also known as 2-pin fans I'm posting this as a bit of a compendium of info from other threads and my own testing for those that might be interested. So I started reading all the various threads on replacing stock fans with quieter ones (Noctua or Gelid being my preference) and there's seemingly a few people that have done this, although the Apple-specific PWM implementation* always seems to be the gotcha. I don't mind them making a little noise when they're really working, but in low utilisation and idle states I still get annoyed by them even with all fans on minimum. ![]() My normal workstations are entirely passively cooled and silence is bliss, but I do still use my cMPs when I need machines with a bit more power or more cores for testing virtual environments and the noise of my 5,1s has always annoyed me. I've been reading around this subject for a while as a pet peeve of mine is noisy computers. ![]()
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