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   In message , druck    
   writes   
   >On 09/04/2024 13:52, Adrian wrote:   
   >> Apart from the Pi4, to upgrade, I know that I will need a bigger   
   >>power supply and a HDMI adapter lead, but after, things are a bit   
   >>vague.  Can I get away with the Pi4 without any additional cooling, or   
   >>do I need a heat sink or fan, and if so, how do they get on with the   
   >>hat ?  The space it is in has had a temperature range of -1 to 40   
   >>degrees C, the mean across that time is about 15.5C.   
   >   
   >40C is quite a high ambient temperature. If you are going to run the Pi   
   >4B hard with the likes of matplotlib, passive cooling my not be enough   
   >to stop it throttling. One of mine has a large heat sink case with no   
   >fan and never goes over 60C, but that's at a 20C ambient. For 40C   
   >ambient, I would recommend a fan case, go for a 40mm fan if you want it   
   >to be quiet, 30mm ones can be noisy.   
   >   
      
   40 was probably a one off (heat wave), but mid 30s occur every summer   
   month.   
      
   I've been looking at fan cases, but they all seem to prevent the use of   
   the HAT, which means I won't be able to find out what the ambient   
   temperature is.  I suppose I could design one of my own.   
      
   Adrian   
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