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Engender

macrumors regular
Original poster
Oct 6, 2007
193
54
First, title should say "repaste" and not "repast."

Second, I would be interested to see if people who have problems with their 2018 Mac Mini are getting thermal throttling. You can find this out by opening a terminal window and entering the command
Bash:
pmset -g thermlog
.

A few days ago, I had my Mac Mini with the bottom open and a 140mm PC fan above and below. Regardless, I was getting multiple CPUs hitting 100 celsius. I download the TG Pro app, and I saw that everything in the Mini case was cool except for the CPU.

Interestingly, this was leading to the process called WindowServer to hit more than 100% in Activity Monitor. Even though the CPU was staying at 60%, I started to get really, really bad input lag. This was happening when I had like five safari pages open and MS Word.

I had already upgraded the Mini's memory to 64 GBs. In that process, I broke the male part of the main fan and the female part of the Wifi antenna. I purchased another fan and I've used electrical tape for the Wifi Antenna (not my first time dealing with those delicate Mac antenna connectors).

Last night, I finally just said screw it and I repasted the CPU. In the process, I discovered that there was very little dry thermal paste on the CPU, but a lot on the part of the cooler that sits on top of the CPU. I failed to take a photo of the CPU and cooler in this state, unfortunately.

i used Thermal Grizzle Hydronaut. Before, CPU PECI was hitting 100 celsius regularly. Granted, I've only had the Mini booted for like 30 minutes, but CPU PECI has only hit 89 Celsius at this point.

I've realized that no computer design engineer is going to make a product that has a CPU that throttles itself on a regular basis. If this happening on your Mac, and you have Apple Care, take it in for service. If not, and it's a 2018 Mac Mini, just set aside some time and repaste the CPU. Make sure you have all the tools and enough time first. Good luck!
 
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Is this throttling when doing normal light tasks or a benchmark? I don’t have my Mac mini anymore, but it would get to 100 C on benchmarks or heavy CPU intensive tasks but nothing close to that on idle or doing stuff like browsing the web. It wasn’t even in the 80s. If I remember right, it was somewhere below 60 but I’m not 100% sure of that.

Perhaps the newest macOS is a bit harder on the CPU?


I took mine apart to upgrade the ram, and that was an interesting task. I would not recommend anyone doing this unless they’ve had experience taking apart a laptop. It felt similar to that with all the small connectors and screws.
 
Here's roughly what I stated on another thread:

My i7 2018 Mac mini cooked itself to death. I (Apple Warranty!) replaced it with a M2 Pro mini and could not be more satisfied.

The 17 always ran super hot.
 
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Here's roughly what I stated on another thread:

My i7 2018 Mac mini cooked itself to death. I (Apple Warranty!) replaced it with a M2 Pro mini and could not be more satisfied.

The 17 always ran super hot.
You got Apple to replace your Intel Mac mini with an M2 Pro for a warranty? Wow I’d consider that a heck of an upgrade! They usually keep new old stock to replace things under warranty.

My i7 mini never really ran hot unless I was doing a benchmark or playing games. Doing light tasks it was fairly cool. Maybe I got lucky but I only had it for about a year.
 
I was fortunate(?) to be at the very end of my AppleCare Extended Warranty - only 2 days left when I took it in to be checked. As it was a top-of-the-line spec 17 mini, the base M2 didn't have sufficient Thunderbolt ports, so Apple (after considerable back-and-forth) replaced it with the M2 Pro.
 
My Mini was hitting PROCHOT after boot, with Mail, three or four Safari pages, Calendar, and TG Pro running.

This weekend, I played Civ 6 on it!
 
What I would recommend, before you repaste the CPU, purchase a 2018 Mini being sold for parts and practice taking it apart and putting it back together again BEFORE repasting yours.
 
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