You need to run cpuburn-a53 to really test your setups. Also you probably want to overclock by 10% without any over-voltage (I have found my RPi4 to be stable with 15% overclock with no overvoltage). The goal is to not thermal throttle for as long as possible on maximum load (bonus points for doing it at the lowest cost and lowest impact to your workspace... i.e. noise, access to ports and gpio header).Ultrabit wrote: ↑Thu Aug 01, 2019 6:04 pmI thought I'd share my experience with colling my Pi4 B+. Granted I've not done stress tests etc but still I thought someone might find it of use. I'm using the metal case in the photo below.
Case lid ON, no heatsink at idle 69 degrees
Case lid OFF, no heatsink at idle 61 degrees
Adafruit 15x15x15mm heatsink case lid OFF at idle 61 degrees (ie. makes no difference at all). Heatsink noted to have got very hot.
28x28x18mm heatsink from Ebay/RS case lid OFF at idle 54 degrees
28x28x18mm heatsink from Ebay/RS case lid ON at idle 62 degrees (a reduction of 7 degrees in total).
With my Adafruit heatsink and no case I can last 1 minute on maximum load before I thermal throttle, and that is more than enough for me as I just want my apps to load as fast as possible. I sometimes will do Gimp image manipulation but it usually completes in less than 10 seconds.
I suspect that with no case, no heatsink and no overclock that it could last for 1 minute at maximum load before thermal throttling... and that is perfectly fine for the average user. For me, the $2 heatsink and $2 gpio extender is worth the 15% overclock.
Just my opinion.