I can highly recommend a case like this for Pi4 https://www.ebay.co.uk/itm/for-Raspberry-Pi-4-Model-B-Aluminum-Case-Passive-Cooling-Aluminum-Alloy-Pr-I6M9/362967021701?epid=20034378788&hash=item5482853885:g:UY0AAOSwUwRekBG0
If you're hitting heat limits in normal use, there is definitely something wrong with your case. Have you installed heatsinks? Only cost a couple of quid and make a big difference...
I've got a heatsink but also got this case with bugger all ventilation (hence the dremel plan).
It's repairing 20GB RAR files which tends to be a bit of a killer. Can be a couple of hours of 100% CPU
I've got one of those cases. Well made but not the most practical. Just pop the top off and it'll be fine :D
@aggi started
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I can highly recommend a case like this for Pi4 https://www.ebay.co.uk/itm/for-Raspberry-Pi-4-Model-B-Aluminum-Case-Passive-Cooling-Aluminum-Alloy-Pr-I6M9/362967021701?epid=20034378788&hash=item5482853885:g:UY0AAOSwUwRekBG0
If you're hitting heat limits in normal use, there is definitely something wrong with your case. Have you installed heatsinks? Only cost a couple of quid and make a big difference...