Heat Spreader Performance and Overclocking


Magic Sam

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Hi all :)

@ouzle : thank you for the detailed answer, really appreciated !

The temperatures script just returned the following values:

samuel@pyra:/usr/share/pyra/scripts/letux$ ./temperatures
Mon 14 Jun 19:51:32 CEST 2021 67° 67° 65° 44° 3672mV 1000MHz

Isn't that a bit too warm ?

It's almost 8 P.M where I live and 31.5° C indoors, and it's not summer time yet :D

Cheers, Magic Sam
 

EvilDragon

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You can limit the CPU speed which will keep it a bit cooler.
There's not much else you can do - unless you find the time to improve and debug the overall system (for example, find out if something needs too much CPU power, etc.)
 

docbroke

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Output of "htop" may tell which processes are using more CPU power, with full fledged desktop running there will some not needed processes. I don't know how well it will run but I think LXDE will use much less cpu and ram compared to mate or xfce.
 

EvilDragon

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Output of "htop" may tell which processes are using more CPU power, with full fledged desktop running there will some not needed processes. I don't know how well it will run but I think LXDE will use much less cpu and ram compared to mate or xfce.

It's probably more small things like IRQs and other stuff needing to much power - because the system gets warm even when idling.
 

levi

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You can also view named kernel threads in htop by pressing upper case K (lower case k is for kill, so be careful). Or if you just want a single snapshot rather than a continually updating list, ps -ely --sort pcpu will print out all threads including kernel threads sorted so that the higest percentage cpu thread is listed at the bottom (or you can do ... --sort time which will sort based on cumulative cpu time since boot, which might be better for sporadic threads you might miss)
 

Magic Sam

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Hi all !

If I remember correctly @EvilDragon you once suggested adding small fans inside the SD card slots.

Is this option still around ? I'd prefer to stick to passive cooling but my Pyra feels really warm at the moment...

Cheers, Magic Sam
 

EvilDragon

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Not inside the SD card slots, but you can put them directly to the heatsink. There are small enough ones that fit. They're pretty annoying in sound though.

I don't think your Pyra runs hotter than others... So I wonder of you're more sensitive here?

Oh, have you lowered the LED brightness of the keyboard? These run at full strength as default, and they can warm the keyboard quite a bit.
 

Letalis Sonus

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Variance in manufacturing can be pretty huge in silicon chips - surprisingly there isn't even a direct connection between heat and energy consumption.

der8auer made a video (German version) about a year ago where he compared 30 Intel CPUs of the same model but from different manufacturing batches, and the magnitude of variance was pretty insane.
 

EvilDragon

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Wow, didn't expect it to be THAT big... but it still shouldn't go very hot when idling.
 
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