Hey -
apologies if this has been covered, I'm still a noob.
My goal is to set up a cluster of 5 raspberry pi 3s working together to crunch SETI data.
I haven't yet set them up as a cluster, but I have stacked them and have given them each a 16GB SD card running the latest vertion of Rasbain. And I've installed Boinc and linked my account. All are running seti now but they're all fluttering around 85 degrees C.

I can't explain it. They all have heat sinks and it doesn't seem to matter what settings I apply to the computing options.
I'm a bit frustrated as I've tried everything I can think to try.

Can anyone suggest anyhting that will allow me to keep these guys crunching but at a lower temp?

(for bonus points, can anyone point this noob to a good tutorial on setting up a cluster of Pi 3s to run boinc?) :D

disregard the bonus question... I just saw this:
https://setiathome.berkeley.edu/forum_thread.php?id=82365#1907585
:)

Just a heat sink on the Pi's isn't going to do it. You'll need active cooling, something like this one which you can connect to one of the USB ports.

That said, 85C is apparently a perfectly fine temperature for a Pi to run at.

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Thanks for the reply.
I'd be a lot more comfortable if I could deal with this at the root...
I find this whole issue quite perplexing. I've run a Pi with Kodi, RetroPi, TOR, a camera and a host of other projects and never had an issue with heat.
Is it at all possible that the Ankler usb power hub can be causing this issue? I'm going to plug the pis into a power bar and see if it makes a difference.

All of the examples you mentioned do not use the CPU in a heavy and sustained way that Seti does. Seti does heavy calculations among others with the Fast Fourier transform (fft) algorithm, to see if your chunk of data holds any interesting bits of information. These sustained calculations will heat up your CPU enormously.

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I have similar setup, cluster of 5 RPi.
You need definitely a fan to keep the temperature down and to get a full power of the CPU.
I use just a small one plugged to USB hub cooling down all nodes