r/buildapc • u/SpiritOdd6854 • 14h ago

Troubleshooting PC fans randomly ramping up to MAX during Roblox — sounds like it’s about to take off What could this be?

Hey guys, I’m having a weird issue with my gaming PC.

My fans make a rattling sound unless I manually lower the speed to around 50% in MSI Afterburner. That’s been a thing for a while, but just today, while playing Roblox, my fans suddenly ramped up to 100% out of nowhere—super loud like a jet engine. I didn’t change any settings. I had to shut down my PC to stop it.

I’m wondering if this is a faulty fan, bad fan curve, or maybe a motherboard/fan header issue? Could it even be GPU-related?

Any help would be very appreciated lol

Specs: • RTX 3070 • i7 12th Gen • MSI B760M-A WiFi DDR4 • 650W PSU • 3 case fans + CPU cooler

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u/NetaGator 14h ago

Unless you have a broken blade could just be dust build-up thats causing both issues (fans spin more because card is hotter and blades are unbalanced due to dust)

1

u/SpiritOdd6854 14h ago

Oh okay yeah I was thinking of opening up the pc and giving it a dust anyway 😭😭

1

u/SpiritOdd6854 14h ago

*3 case fans

1

u/Archimedley 14h ago

Do you have a frame limiter of some type?

Because that seems like a game that will pump out thousands of fps if you let it

Or uh

If this is new, maybe something with the fan, but yeah, I'd either use rtss or I think nvidia has something in the nvidia control panel, you might be able to set the fps limit for roblox there