Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
Sounds like maybe you have a mini with a poor thermal paste job done on it.

Don't know your skill level, nor the complexity of taking apart the mini, but repasting may be an option
As posted by another user, the warm case means exactly the opposite. It is getting warm because the heat source is well connected to the case thermally. I suspect the PSU is the culprit, but cannot be sure. CPU temps seem well controlled but certainly not ambient. I think it all boils down to a small unit with a lot of electronics and it gets warm. Whether this causes premature failure is yet to be determined. It would be nice if Apple published typical case temperatures indicating design criteria.
 
It would be nice if Apple published typical case temperatures indicating design criteria.
No temps but...


If we compare the power consumption and relevant thermal output versus earlier M series, plus consider the smaller case and the power board relocation (from side to top), it’s evident why the case can be warmer.
 
No temps but...


If we compare the power consumption and relevant thermal output versus earlier M series, plus consider the smaller case and the power board relocation (from side to top), it’s evident why the case can be warmer.
Yes, at 17 btu/hr, a 10C rise in case temp is not to be unexpected. So I think you have the answer here. Makes sense.
 
Just a quick update. I found the major contributor to excessive warming issue when sleeping. What I could not understand is the fact that it been up to 54C while sleeping and finally, after several reboots it suddenly dropped to 34C.

Now suddenly it was really quite hot to the touch again, 54C, and it was then I discovered the process that was causing the issue. I have Malwarebytes installed and I assumed it paused real time malware event scanning when asleep, but it does not always do so. Turning off real time event detection, stopped a process called RTProtectionDaemon running and hey presto, the temperatures dropped back to 34C, 10C above ambient.

Now as to why it sometimes runs while asleep and sometimes does not remains a mystery. However, I had just made a 3 TB backup copy of my current photo files to the attached RAID disk system and I am wondering whether it was scanning the new copy on the attached drive. Not necessary but it may have thought it necessary. Anyway the issue seems to be resolved for the moment and I post this just in case it maybe of some help to other posters.
 
  • Like
Reactions: MacCheetah3
I reboot stay logged out, set to sleep. Case is then warm. (No-Fans power supply only-Guess)=heat.
Login wake up fans kick in cools down. Every day.
Non-issue.
 
I reboot stay logged out, set to sleep. Case is then warm
I don't put my studio to sleep - hell, I don't even see any settings to put it to sleep after x number of minutes inactivity. My temps are between 30 and 40c on idle, with the fans running at minimum speed (1,000rpm).
 
I am concerned that the external drive fan will prematurely die since it never turns off but apart from ejecting it and unplugging it, there seems to be no way to stop or power down the external drives. The case on the external drive is around 34C when the Mini is sleeping.
I would be more concerned about constantly sleeping the external HDD. The fan is what, $10? And it's not a necessity. The HDD, on the other hand, will wear far quicker with constant on-offs, versus just keeping it on 24/7. It's a mechanical device, and thus more susceptible to cycle stress.
So I am still mildly concerned that my Mini runs 10C above ambient when sleeping and the external TB 5 drive never sleeps and the little fan never stops while connected to the Mini. Long term reliability is a serious concern here. BTW I purchased a rather nice wooden stand for my Mini that gives easier access to my power button.
Does the wooden stand cover any of the bottom air vents? Nonetheless I don't think you should worry about a slight change in sleep temps.
RTProtectionDaemon
This is a Malwarebytes background program. Up to you whether or not you think you need it, but macOS does have its own built-in antimalware (Gatekeeper, Xprotect).
 
I would be more concerned about constantly sleeping the external HDD. The fan is what, $10? And it's not a necessity. The HDD, on the other hand, will wear far quicker with constant on-offs, versus just keeping it on 24/7. It's a mechanical device, and thus more susceptible to cycle stress.
It is a Samsung 990 Pro 4TB SSD in a Trebleet enclosure, which includes a small continuously running fan. So I am not worried about mechanical failure. About to change to an OWC enclosure which has better heat sinking and no fan.
Does the wooden stand cover any of the bottom air vents? Nonetheless I don't think you should worry about a slight change in sleep temps.
No, it has slots cut into the bottom. I carefully checked temperatures with and without the base. No difference. I only added the base after I needed better access to the power button.
This is a Malwarebytes background program. Up to you whether or not you think you need it, but macOS does have its own built-in antimalware (Gatekeeper, Xprotect).
Yes, this is what I indicated in my post and I changed the Malwarebytes configuration to stop real time event monitoring. I turned it back on after around 2 hours and the daemon started running again but was not consuming anywhere near the same resources. I think the large file movement, 3TB, caused the event monitoring to run and consume resources. Once I turned it off and on, it reduced CPU usage down to <5%. Now I know what it is doing I can be prepared for the temperature rise and not be concerned.
 
Last edited:
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.