![]() ![]() What the OP has effectively demonstrated is that Apple's extensive efforts and expenditure towards building out a thermal management solution that covers the entire performance envelope have been successful. The check mark will disappear and the test will stop running. To stop the test, open the Test menu and click again on the menu item with the check marks.A check mark will appear on the selected menu item and the tests will start.In the Test menu, select Maximum Frequency under Intel Graphics Tests.In the Test menu, select All Thread Frequency under CPU Tests.It also has built-in test suites to test both the CPU and GPU The Intel Power Gadgets app is very useful for more accurate monitoring of the CPU while stress testing it. If that doesn't happen, it's a good guess that some CPU throttling is happening. This should easily use up all the CPU cores to 100% and in just 5-10 minutes cause the CPU to touch 100 degrees at room temperature (28 to 35 degrees here). And most important, set the encoder / H.265 "Preset" to "veryslow". In the Video tab, choose H.265 (x265) in the "Video Codec" drop-down menu. Open any 720p or above 1+ hour long movie in Handbrake. HEVC encoding is very CPU intensive and is a good way to stress your CPU. One way to really use all the CPU cores fully, for a while, would be to encode a movie using x265 / HEVC encoding. If you use a hardware encoder (VideoToolbox) on Handbrake the encoding will be done by the hardware encoder on the CPU, and not by the CPU cores. The Youtube video maybe being decoded by the hardware decoder in the CPU. Though, I do have a doubt if you are stressing your CPU enough. And Apple parts and repair costs are very high.)Įven I find it hard to believe that your CPU doesn't cross 85 degrees with what you described. It can reduce the life of the CPU fan and the CPU and in worst cases even damage it. ( Note: Be careful in messing with the default fan speeds and / or CPU voltage settings to overclock the CPUs. (This is more true for the Apple laptops than their desktop counterpart though, unless you have made custom modifications to your desktop Mac). So to meet this design need of "quiet and thus less distracting" computers, I feel they do resort to more CPU throttling than necessary, and a slower ramp of the fan speed to reduce the fan noise, at the slight expense of CPU performance. One of the things Apple's marketing likes to highlight is that the mac is "quiet" and you can "barely" hear the CPU fan. Personally, I've felt that the default Apple settings for heat management, while really ideal for the majority use cases on Mac, aren't the most optimal when you really want full CPU performance. And only after that will it slowly increase the fan speed to further cool down the CPU. ![]() Instead it will wait for sometime to allow its metal body to act like a secondary heat sink and absorb some of the heat. As the CPU crunches data and heats up, the Mini will not immediately increase the fan speed. but my fans still didn't ramp up after a few hours of testing. If so, how do I prevent this from happening? One suspicion I have is that for some reason my CPU is being throttled or underclocked for some reason. What's quite surprising is the thermal limit, it seems like it doesn't want to go past 85☌ whereas every other Apple CPU I've seen gets close to the max junction temperature (usually 105☌) before the fans start kicking in to keep it from throttling. General temperatures, power usage, fan speed, and other stats:ĬPU Usage (left) and fan Speed, around 2000 rpm (right) This is what my stats looked like during the hour that I checked in with it: Definitely more than necessary but my fans still didn't ramp up after a few hours of testing. To stress test the CPU I tried running 16 instances of yes > /dev/null &, play an 8K video on YouTube, and compress a video on Handbrake. It would never reach the maximum of 4845 rpm (100%) unless I manually set it using iStat Menus. Using iStat Menus I noticed that it would usually stay around its base speed of 1800 rpm (0% of the fan speed range), and go up to 2000 (7%) rpm under heavy load. I noticed that no matter how much I used it, the fans barely ramped up. I have a 2014 Mac mini with an Intel Core i5 processor. ![]()
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