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Forum: Hardware Chat Room
Thread: surprisingly fast Raspberry Pi spotted |
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Thread Status: Active Total posts in this thread: 36
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KerSamson
Master Cruncher Switzerland Joined: Jan 29, 2007 Post Count: 1684 Status: Offline Project Badges: 
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Thank you BobbyB for sharing.
----------------------------------------It is an interesting enhancement. The only question is: how noisy is it? Cheers, Yves |
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BobbyB
Veteran Cruncher Canada Joined: Apr 25, 2020 Post Count: 638 Status: Offline Project Badges:
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Never thought of that. It's inside the closed case so it should be muffled a bit.
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poppinfresh99
Cruncher Joined: Feb 29, 2020 Post Count: 49 Status: Offline Project Badges: 
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I also wonder how much extra power the fan uses (website just says 5V).
----------------------------------------Bobby, because it is ARM, the Raspberry Pi 4 can do a lot of calculation for a small amount of watts... http://web.eece.maine.edu/~vweaver/group/green_machines.html Though, the Pi 4 is 28-nm (unlike the new 5-nm Apple M1), so your AMD has a chance of getting better GFLOPS/W ?? [Edit 1 times, last edit by poppinfresh99 at Dec 3, 2020 11:00:40 PM] |
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aaabaaab
Cruncher Joined: Jul 31, 2016 Post Count: 42 Status: Offline Project Badges: 
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Thank you BobbyB for sharing. It is an interesting enhancement. The only question is: how noisy is it? Cheers, Yves The fan could be connected to the 3.3V pin of GPIO. It will spin slower but will be silent. I have 2 RP4 running like this.  |
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andreba57
Cruncher Italy Joined: Apr 14, 2020 Post Count: 5 Status: Offline Project Badges: 
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I'm not 100% sure that cooling is responsible for being able to use only three cores. In my case it was memory - I had to install Raspbian Lite instead of the full version, and look and behold the fourth core kicked in and has being churning work units since May. I even got some spare RAM left for putting tmp files and logs into tmpfs and using zram instead of the swap file.
(My 4gb Pi 4b lives in a fanless armor case, which does a good job of keeping the CPU temp under 60C° whatever I throw at it- i did point a fan at it this summer though, just to be on the safe side). |
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poppinfresh99
Cruncher Joined: Feb 29, 2020 Post Count: 49 Status: Offline Project Badges:
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andreba57, the Pi 4 (and 3B+) has a soft temperature limit of 60 degrees
https://www.raspberrypi.org/documentation/har...i/frequency-management.md Though 4 cores at 60 degrees without a fan is still impressive! I bet removing the soft limit would allow for more computation and higher temperatures. My Pi 3B (no fan) is around 75 degrees with 4 cores running IN THE WINTER. I find it very hard to believe that a 4 GiB Pi would run out of RAM! My 3B has 1 GiB, and it will run 4 tasks *if* I allow BOINC to use 70% of the RAM (60% isn't always enough). I don't have Lite installed (I use the normal RaspiOS), though I usually only use SSH to access the Pi. |
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