dirthurts
Posts: 32
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Pi 3 overheating

Wed May 24, 2017 4:54 pm

Hi there,

As stated in the topic, my Raspberry pi 3 is overheating. It's hitting 80C and throttling really hard. I'm using the Raspberry Pi Foundation case, which I assumed was fine, but I'm thinking that's the problem.

I have some heatsinks on the way, but they're from China and taking forever.

I was always told that the Pi 3 didn't need heatsinks, and it baffles me to think that the Foundation case might be bad for them. Any other thoughts?

It's worth noting that I was just running a youtube clip when it happened (rather quickly).

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mahjongg
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Re: Pi 3 overheating

Wed May 24, 2017 5:30 pm

It has always been said that a PI3 needs a heatsink on the SoC if you start using the GPU intensively (as in decoding video), or it will throttle down do avoid becoming too hot.

dirthurts
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Re: Pi 3 overheating

Wed May 24, 2017 5:38 pm

Hmmm.
I never considered that watching Youtube is actually decoding. I guess I'll have to get a heatsink on this thing faster.
Think I'll need to replace the case? There appears to be no vents on it.

fred44nl
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Location: Scharendijke, NL

Re: Pi 3 overheating

Wed May 24, 2017 5:54 pm

how can you tell that the processor is throttling down ??
headless RPi 3B running from usbhdd.

dirthurts
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Joined: Fri Dec 23, 2016 4:04 am

Re: Pi 3 overheating

Wed May 24, 2017 6:02 pm

Everything gets stuttery and practically freezes as it hits 80c. It's a dramatic change. Temperature tested via terminal commands, confirmed by not being able to touch the CPU without literally hurting myself (it got that hot).
Plus, a blood red thermometer shows up in the upper right hand side of the display.

jahboater
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Re: Pi 3 overheating

Wed May 24, 2017 6:25 pm

fred44nl wrote:how can you tell that the processor is throttling down ??
https://github.com/MilhouseVH/bcmstat/b ... bcmstat.sh
Run this and you can see the temps/clock speeds in real time.

dirthurts
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Re: Pi 3 overheating

Wed May 24, 2017 6:45 pm

I have the program running above, but it's very complicated to look at and hard to read. But, it works. I'm idling iwth the case top off at around 55-57 C.
That can't be normal. Is my unit defective in some way? My other Pi 3 doesn't have this issue at all.

jamesh
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Re: Pi 3 overheating

Thu May 25, 2017 9:22 am

It sounds like you are doing software decoding rather than using the HW decoder. SW decoding video will run all four ARM cores at full tilt, which is where the heat is coming from.

If you can use HW decoding, you should. Keeps things a lot cooler.
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startrek.steve
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Re: Pi 3 overheating

Thu May 25, 2017 9:44 am

fred44nl wrote:how can you tell that the processor is throttling down ??
I can see it in Conky, very useful.

Steve
Pi 2 running LibreElec Krypton, Pi 2 running Wheezy Desktop, Pi 1 headless Wheezy, downloading Radio, Pi 1 running Picore headless Media Server, Pi Zero to be an Old Time Radio Project. Pi 3 testing. Pi Zero W downloading Radio shows headless.

dirthurts
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Re: Pi 3 overheating

Thu May 25, 2017 11:50 am

How can I use hardware decoding on Youtube?
I'm quite new to this stuff. Still trying to figure out Python...

fred44nl
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Re: Pi 3 overheating

Thu May 25, 2017 5:52 pm

startrek.steve wrote:
fred44nl wrote:how can you tell that the processor is throttling down ??
I can see it in Conky, very useful.
is there also a command-line option ??
headless RPi 3B running from usbhdd.

dirthurts
Posts: 32
Joined: Fri Dec 23, 2016 4:04 am

Re: Pi 3 overheating

Thu May 25, 2017 11:20 pm

Just an update.
I ordered another Pi 3 and popped in the same SD card (and thus installation) and it idles 15 degrees C cooler and runs much cooler under load with only a little throttling under heavy work loads. There's definitely something up, or these things are just made with no consistency to them. I'm going to drop a heat sink on the original and see if that helps.

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