GPU spikes 100% fan speed then normal, then again forming a loop. Why?

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Ragnarous

Ragnarous

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Sep 15, 2013
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Hey everyone, I have a GTX 980Ti HoF and I noticed upon waking my computer from sleep or restarting, the first thing the GPU does after displaying what should rumples to a 100% speed fan for like 5 seconds, then drops to normal for another 3-5 then goes back up again and it stops whenever it feels like.
I uninstall MSI Afterburner hoping that it was some bug within their fan curve but nop, thing still continues. Tonight it has been very bad as it looped like 12 times like this before becoming normal and it freaked me out.
Anyone knows what may cause this?
Thank you!
 
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Shaun o

Shaun o

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Oct 7, 2007
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When you turn your system on first of all nearly all graphics cards do what you are talking about.
I presumed it was some sort of check, or calibration check of the Rpm range or the fan curve that is programmed into the bios settings of the card, as much as a simple check to make sure the fans of the card are still working as they should be before any gaming load is put on the Gpu of the card to prevent too much heat build up of the Gpu.

In a sense that would sound right as when you power on the system the motherboard also checks the cpu fan and any system case fans for rotation and rpm speeds also.

But why it is pulsing up to as many times as you say, may mean a fan, or one of the fans of the card is not reaching it`s maximum rpm speed according to the fan curve settings stored the bios of the graphics card so it is performing the test more than the once.

Maybe the card is a bit clogged with dust if it`s been in the system for a few months and just needs a quick brush down Ragnarous.
 
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Ragnarous

Ragnarous

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Thank you for the detailed answer. Upon inspection, I noticed that the middle fan which is the biggest doesnt spin. I also noticed that it attempts to spin for a quarter of a circle and stops, then tries again after 5 seconds until he manages to start going. Does that indicate dust buildup? Or electrical failure?
 
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