On Mon, Apr 2, 2018 at 10:44 AM, Adam Holt <h...@laptop.org> wrote: > 1) Recap from 2016: heatsinks on the original RPi3 CPU are not a cure-all > when the RPi 3 is enclosed in a case that lacks ventilation on a hot day. > But CPU heatsinks Do Work when taking the plastic top off the of the > original RPi 3. The CPU throttling problem "immediately" goes away on such > hot days...bringing the temperature back down below 80C...as measured by > the command: > > *vcgencmd measure_temp* > > 2) It's snowing today right outside my window, so I can't easily simulate > a hot summer's day -- but can others who live in hot environments report > back their readings above, when running the new RPi3 B+ in various > conditions? > > - *With heatsink on CPU -- and without?* > - *With motherboard fully enclose by a case -- and without?* > > My own results, with all 4 CPU's unloaded, in a chilly room:
RPi 3 / RPi 3 B+ 44-46C / 46-48C case's plastic top removed (w/o wind or active ventilation) 46-49C / 48-51C case's plastic top attached (contains 100+ small holes on 1 end, allowing very little ventilation) After I ran "*yes > /dev/null &*" 4 times, to fully load all 4 cores of the CPU: RPi 3 / RPi 3 B+ 80-82C / 70-71C case's plastic top removed (w/o wind or active ventilation) 82-84C / 75-78C case's plastic top attached (contains 100+ small holes on 1 end, allowing very little ventilation) CONCLUSION: the RPi 3 B+ appears to be a real winner in CPU-intensive conditions, even in a "wintry" conditions (room is about 15C, and it continues to snow right outside the window). The RPi 3 CPU is supposed to self-throttle at 80C, until it just about turns itself off at 85C. I'd assume the RPi 3 B+ CPU does the same? But do not know for sure. Thanks to all who can add any similar data points, in warmer climate/conditions. CLARIFS: Both RPi's were running a near-final prerelease of Internet-in-a-Box 6.5 on Raspbian Lite to explore real-world conditions. I waited 10+ min in all above 8 experiments before taking "steady state" temp readings. Still, fluctuations in CPU activity (and temperature) arise, even long after I ran "killall yes" to end the most intensive CPU activity. 3) Prelim thermal analysis of RPi 3 B+: > > https://cdn-images-1.medium.com/max/1600/1*0jU89Yu_6miI-CODBMuHAw.png > https://medium.com/@ghalfacree/benchmarking-the-raspberry- > pi-3-b-plus-44122cf3d806 > > -- > > <https://medium.com/@ghalfacree/benchmarking-the-raspberry-pi-3-b-plus-44122cf3d806> > > <https://medium.com/@ghalfacree/benchmarking-the-raspberry-pi-3-b-plus-44122cf3d806> > Unsung Heroes of OLPC, interviewed live @ > <https://medium.com/@ghalfacree/benchmarking-the-raspberry-pi-3-b-plus-44122cf3d806> > http://unleashkids.org ! >
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