Whenever the SMC system resets to its default, SSD Fan Control takes over again to make sure that your system remains quiet. The core of the system is a daemon that runs in the background and takes care of the fan management. It enables you to overrule the automatic fan control and manually configure the fan speed. In both cases the SMC system tends to go into frenzy and drive you mad with a loud fan. Sometimes reusing the external sensor is not possible or, as in more recent generations of iMacs, replacing the original hard disk breaks the system’s temperature monitoring.
The SMC collects data from external sensors or by reading the internal hard disk temperature in a proprietary manner. Fan management in Apple systems relies on temperatures reported by the SMC system. This would basically get the job done if it works on the rMBP as well, but I'd prefer something friendlier.IMac users who tweak their systems using 3rd party hard disks or solid state disks, are often surprised by an unpleasant aftermath: an annoyingly noisy hard disk fan.
When I did this sort of experimenting on my Macbook Air there seemed to be a method which involved setting the desired setting in smcFanControl in OS X and then sometimes rebooting into windows would have the setting stick. My understanding is that under OS X I can use the smcFanControl app to manually specify the fan RPMs, but I have not been able to find a similar way to control or fix the fan speed once I am booted into Windows. So long as the 105 degree Tj Max point is not passed the computer keeps up with whatever game you're playing just fine. So I hope this makes it clear that Apple's fan speed scaling is a bit on the conservative side when the temperatures are high.įrom what I can tell, once you get the machine nice and toasty and the load "stabilizes" it will generally be in a state of equilibrium where the CPU core temperatures hover in the high 80's and 90 degrees C, making occasional excursions above 100 degrees C. I know that the fans are capable of running higher than the highest they have been recorded to run which is in the neighborhood of 4900 RPM, they should be capable of going to 6000 RPM, which, even though it would be noisy would be keeping the CPU cooler, which is a good thing in my book. This is somewhat inconvenient of course, as it means the CPU has reached a temperature that it should never reach, and also requires a reboot. Gaming on the rMBP under Windows 7 is a very good experience but I have noticed that unless I elevate the chassis there is a tendency for the automatically regulated fan speed to fail to engage a rising computational load fast enough to keep the CPU under thermal shutdown temperature (Tj max) and freeze the machine.
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