Question CPU fan running really fast

[the_saucerer]

My CPU is mid 30's C, CPU fan is running 700RPM, case fans 500-600 RPM, but the fan sounds like it is running really fast at idle.

What could be the problem? It used to run quiet.

 

[rgd1101]

it is getting dirty?

 

[PangereXx757]

Install ai suite 3 of a rog feature that you can download here https://dlcdnets.asus.com/pub/ASUS/mb/Utility/AI_Suite_III_3.00.13_DIP5_1.05.13.zip
Is an easy software that u can use. Al fans need to be connected to the motherboard otherwise it won't work