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See if there's a cooling profile option in the BIOS. Maybe also run the Dell diagnostics. Might be something wrong with the fan tachometer.
Worst case, assuming the PWM is working properly, you could use a third-party application to control the fan speed.
There are no profiles, just an on/off switch. From what I've seen, there is also no way to control the fans from Windows (Linux somehow manages, though).
Dell power manager on my work laptop has profiles. But that's a laptop.. But still.
On my machine it has one screen: no battery found...
I had an optiplex like this. I would give the top of the case a couple taps and fans would spin down. No idea why that worked but it did it every time, hurricane winds, couple good taps to calm it back down
That sounds just stupid enough to actually work.
But then I would need an ssh-enabled wackity whack in my rack.
It might be a failing fan. I have an Intel nuc whose fan started sounding like an air raid siren, so I took the fan out, drilled a hole into its bearing and added coconut oil into it. It is working fine till this date, but buying a new fan is probably better.
"Nuclear bomb" idea. You remove the PWM fan (speed controlled by BIOS) and you install a single speed but more silent fan
You can stream using Sunlight (server) and Moonlight (client) on linux. What specifically are you trying to stream as it's likely Linux will be able to play them.
https://github.com/LizardByte/Sunshine
Here's how to check to see if the game you want is supported
Here's an easy setup for gaming on linux
https://guidetechy.com/your-ultimate-guide-to-setting-up-arch-linux-for-high-end-gaming-performance
Here's what could help with your fans on boot. However that's a tiny machine and you might want to get a different impeller
Linux is not an option. I tried, see my other comment.
Then you might be interested in the last link I shared in my post.
Tried that. It found one fan, and that's the GPU fan - which spins down just fine, so no gain here.
Streaming games from Linux works perfectly fine 🤷♂️
But not Windows games. Fallout barely runs at all, I tried and it's not fun.
You could run it in a VM with GPU pass through.
....or I could just find a way to fix the fan.
But that wouldn't help with crappy windows 😏
Are you sure you installed all the drivers from https://www.dell.com/support/home/en-ie/product-support/product/optiplex-3060-desktop/drivers ?
Yes.
Instead my Dell optiplex 3060 has the opposite problem, it downclocks the CPU (i3 8100) to 799 MHz for some reason
Dell knows the problem but doesn't have a real fix https://www.dell.com/support/kbdoc/en-us/000145125/processor-speed-limited-to-0-79ghz-800mhz
Luckily, using a program called throttlestop I can force it back to 3 GHz
Never again a Dell
Yeah, I'm also not entirely what to think about the machine. There are definitely some quirks that are 100% Dell doing its own thing instead of using standard parts. On the other hand, the case is extremely easy to disassemble, you hardly need any tools.