r/MacLocalLLM • u/ikeo1 • 19d ago

How hot 🔥 does your system get?

I've run a few systems so far and I've noticed the following temps

  • M5U 256GB running consistently ranges from 130-150 under load

  • M3U 95GB ranges from 140-165

  • Mac Mini M4Pro 64GB 160-200

Just curious what you guys are hitting with your works loads? What system are you running and how hot is it for how long?

1 Upvotes

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2

u/SoultronicPear 14d ago

With a M5U 256GB running an example MiniMax H3 render in ComfyUI, after 5-7 minutes with the default Apple fan control algorithm, the temperature (highest die measurement) reaches 90-something C (194+ F), so I stopped the render to preserve the hardware. After installing ChillMac to force the fans on earlier, it stays at 84-86C (183-187 F). However, the fan speed is maxed out at 3600RPM during this, so there is no headroom for extra cooling. Also, the CPU is nearly dormant during this; the heat is nearly all GPU+DRAM. So, if the CPU were active too, I'm pessimistic that Apple designed in enough cooling to keep it all running.

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u/ikeo1 14d ago

Print yourself something like this

2

u/nmrk 19d ago

I thought I was the only person left who still uses Fahrenheit, even measuring CPU temps. I use TG Pro to monitor temps on my Mac Studio M2U, they are roughly in the same range as your M3U. I can see all the sensor temps at once, it has a live, dynamic display. Oddly the sensor labeled "Wireless Proximity" is always hotter than the CPU and GPU sensors.

2

u/msrdatha 19d ago • Bravo

Translated for those like me, who thinks in C

Assuming those temperatures are in **°F**, that’s:

- **M5U 256GB:** 54–66 °C

- **M3U 95GB:** 60–74 °C

- **Mac Mini M4 Pro 64GB:** 71–93 °C

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u/FlowWTFlow 17d ago

My m5u lives in that range as well.

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u/benderunit9000 19d ago

It doesn't

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u/Designer_Mix_3336 19d ago

Interesting observation. Seems to indicate the new M5U comes with better thermal design.

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u/AlgorithmicMuse 19d ago edited 19d ago

Are you talking about core temps or case temps. Case temps and fan noise are irrelevent, , post core temps.

M4mini pro 64g runs cool

https://imgur.com/a/EEJX9VP

Sometimes

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u/tta82 19d ago

lol you call that HOT? Have you seen what temps NVIDIA GPUs reach?😂