HEATSINKS ?

[TommyBoy]

any of you added heat-sink on the PI3 ?
the two large chips top side of board ?
(the large chip om bottom side, dont get hot at all)
the CPU and DATA load, depends quite a lot what you do, try hi-def files, for a long time and see
the temperature get quite hot.

[gvasco]

If you're not overclocking it than you should be fine. The rpi will auto-throttle the cpu if temps get too hot.


Sent from my iPhone using Tapatalk

[TommyBoy]

if i play music for a long time, my large heatsinks gets very hot,
i don not want the cpu to throttle down, so better keep it colder.

[hondagx35]

Hi TommyBoy,

i don not want the cpu to throttle down, so better keep it colder.

I also wouldn't like my CPU throttling down because of temperature.
The question is, why does it get hot.

if i play music for a long time, my large heatsinks gets very hot,

My RP3 is playing music the last 12 hours and is still not very hot.

Code: Select all

 echo GPU $(/opt/vc/bin/vcgencmd measure_temp)
GPU temp=42.2'C


Your CPU will only get hot when it is under heavy load.
You should check the reason for this.

playing-24-192.jpg (122.43 KiB) Viewed 1172 times

Here you can see the processor load while playing a 24bit 192kHz file.
This is with the local browser activated (displaying Rune UI on a 7" TFT).
This should be an easy task for your device.

Frank

[TommyBoy]

hi frank thanks for getting back on this.
i know how to access the console and execute simple commands
my units are all with no hdmi screen.
i did connect a watt usage meter, and see a clear result, the unit draw more watts in high definition modes
over standard cd resolution modes.
idle is 3 watt
max 5 watt
used a little usb stick for the sound samples, no harddisk.
i tried the temperature read command as suggested
echo GPU $(/opt/vc/bin/vcgencmd measure_temp)
my result is 42.9 in idle, after about 1 hr, board is with heatsinks and compleetly out on the open, not cased

now i enabled I2S and started some hidef audio,
after a few mins: 47.2

packed the board into a simple paper wrap, just to simulate a case where hot air cant move away so easy
after a few mins : 52.6

(i dont dare to do this, with no hearsinks on)

[Discovery]

Hi TommyBoy,

45-50 degrees for sustained periods is fine for CPUs. 60 or above is generally where you should be concerned.

Unscientifically, I can touch both my chips (the CPU and the smaller ethernet chip nearby) and both are just warm to the touch after many hours of music. I can't say the same about PC CPUs when used for long periods.

[TommyBoy]

more test: the cased unit i also got, also with heatsinks
62.3 after 3 hrs playing netradio

what is the over temperature trigger point ??

[Discovery]

For comparison, I tried the temperature measurement after several hours of playing:

[root@runeaudio ~]# echo GPU $(/opt/vc/bin/vcgencmd measure_temp)
GPU temp=28.8'C

This is on a RPi3 running one of the recent nightly builds and Frost_dk's optimisations, including the upsampling to 24bit/192khz.

[TommyBoy]

28.8 C ??? WHAT ??
I got three PI3 running here, they all got exactly the same results as i explain..
and I got heatsinks on all of them.
"Discovery" what kind of super sized heatsink have you got ?
perform your test outside ? you live in Alaska ?

[TommyBoy]

http://makezine.com/2016/03/02/raspberr ... atch-fire/

Read this link

http://pingtool.org/raspberry-pi-heatsi ... benchmark/

And that one