gtechn wrote: ↑
Mon Jul 01, 2019 6:57 pm
It is total amazing watching an empty google page and watching on my PC via ssh the pi4 temperature and htop. 4 Cores maximum load and the pi4 reaches 80°C and it starts to throttle. I already installed small heat sinks on the CPU but i am not sure how much it helps.
The over temperature icon shows up in the upper corner. In this case i use midori as a browser.
With a 40 mm fan at 12V the temperature drops fast to 54°C at 100% load and 26°C ambient temperature. As far as i know,the gpio-fan overlay start the fan at 55°C. It would now permanently toggle the fan.
What i ask myself: The smartphones have similar processors. How is their heat management?
My conclussion about this test: If i want to use the pi4 at high load, i must have a case with active cooling.
Before you despair, updated firmware is coming in a few weeks which drops temps significantly and improves power usage. You can read the "not all pi 4s created equal?" post for more info on this.
I dont despair! I just realized, that at current high outside and inside temperature, even without a case, i must have a fan. I guess the smartphone vendors use heatpipe and such stuff to get their CPUs cool.
With performance governour and CPU fan, i can easy use firefox-esr (with ublock) and watch most of my sites.Some pages seem to use so much JS, that the browser hit 100% CPU (without ublock), but it seems, even YT is useable in firefox, when the CPU dont throttle and can get its heat away and dont need to load so much ads.. With VLC its total easy for the pi4 to play a 1080p video from my NAS.
About the firmware i know, it willsave about 300mW.
So yes, it is really useable as a small desktop (with some preparation).