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From: Pancho <Pancho.Jones@proton.me>
Newsgroups: comp.sys.raspberry-pi
Subject: Re: What do I need to go with a Pi 4
Date: Mon, 15 Apr 2024 20:41:24 +0100
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On 15/04/2024 15:13, druck wrote:
> On 14/04/2024 20:11, The Natural Philosopher wrote:
>> On 14/04/2024 19:51, druck wrote:
>>> The Pi 4B will definitely throttle with only a ventilated case if it 
>>> is anything other than sitting idle all the time.
>>>
>> I am not interested in proof by assertion
>> I had mine up to 130% on 'top' and it never made more than 76°C
> 
> So you were only using 1 and a bit cores, hardly taxing it.
> 
>>> I don't see the point of letting it throttling when an inexpensive 
>>> fan will keep it at full speed under any load.
>>>
>> I question that it will in fact throttle.
> 
> If you do something which uses multiple cores it will.
> 
>> Like so much 'everybody knows'  when you look at it it is in fact 
>> 'everyone believes because people selling fans told them so.
> 
> I'm telling you so, and I'm not selling you a fan, although I do have a 
> bridge going spare if you don't believe that.
>

I don't know what case you are using, but I have tested my geekworm 
aluminium passive case. It does not throttle using:

stress-ng --cpu 4

Calcs suggest it might throttle on the hottest day of the year, but not 
normally.