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I usually do fan controls though BIOS, but it is possible to do it from within the OS.
for Ubuntu: https://askubuntu.com/questions/22108/how-to-control-fan-speed

Also a picture of you cooling setup might help with finding a way to reduce operating temps.

I haven't messed with the cooling at all. It's the stock Z620 setup. I would like the fans to run a little faster though so I can crank up the BOINC CPU-Time to 100% without worrying about heat.

I still have trouble installing software on Ubuntu if it doesn't exist in the Ubuntu Software Store :-) I'm very new...

I installed lmsensors and fancontrol using Synaptic Package Manager, now I'll work through the setup process in that link.

EDIT: I ran into an error "there are no pwn-capable sensor modules installed". I'll try to do it through the bios

Ubuntu sensors don't work with every motherboard. There are a couple of ways to continue:

  1. Look for Hardware Monitor in your BIOS. HP is somewhat notorious for having a hidden BIOS with more options on many of its computers (it is either ctrl+F10 or F11 on the initial splash screen depending on computer model)
  2. If all else fails you can find a cheap fan controller.

Looking at the setup of the Z620, the CPU heat sinks and case fans are all look proprietary. All you can do to improve thermal performance is clean out any dust in the heat sinks and possibly replace the thermal paste on the CPUs.

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